streaky perihilar opacities newborn


In this article, we look at the causes of newborn skin peeling and provide 10 home remedies and treatments. Normal Lung Development Radiographs shows a rounded or spherical opacity with poorly defined margins, unlike a primary or metastatic chest tumour (which are usually very well circumscribed).17. The appearances are similar to those seen in meconium aspiration syndrome. It enters the left portal vein, through the ductusvenosus and into the inferior vena cava (IVC). All rights reserved. In addition to washing a baby with fragrance-free soaps, parents should clean a babys clothing in detergents that do not contain unnecessary fragrances. The patients are profoundly hypoxic, and persistent fetal circulation caused by hypoxia-induced pulmonary hypertension usually further compromises the infants condition. There may be additional helpful findings and clinical history to indicate this diagnosis. Lymphocytic infiltrative disease produces a reticulonodular pattern that is indistinguishable from infection (, Pulmonary aeration abnormalities are best evaluated on the chest radiograph by observing the following criteria: (, Pulmonary hypoplasia in the neonate can be unilateral or bilateral. The umbilical venous line courses superiorly towards the liver. Healthline has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical associations. The undulated appearance of the left thymic border is due to rib indentation (arrow). Cardiac failure as a primary cause of pleural effusion in children is not common. (2018, January). 76-1). At the time the article was created Jeremy Jones had no recorded disclosures. Normal skin peeling in newborns usually does not require any special . Are there different types of opacities in the lung? (2020). These will range from the presentation of congenital abnormalities, infections through to complex immunodeficiency syndromes and malignancy. One cause of acute breathlessness in a neonatal patient is a mass within the hemithorax causing ipsilateral pulmonary hypoplasia/atelectasis and mediastinal shift. Transplacentally acquired infections are rare. Limiting a babys exposure to cold air can help to prevent this. A PA erect radiograph taken at full inspiration is optimal but difficult to obtain in uncooperative children; hence, an AP supine view is usually obtained in infants and small children. 2014;35(10):417-28; quiz 429. cystic change) or predisposing factors, e.g. White opacities in both lungs in someone known to have heart failure is most likely edema or fluid in the lungs. Some conditions will result in multiple types of opacities. Leukemia, lymphoma, and lymphatic metastases to the lungs can also cause a reticular or reticulonodular infiltrative pattern. In the premature infant there maybe diffuse fine granular opacification, similar to the appearances seen in IRDS.7 Some infants may have both IRDS and group B streptococcus pneumonia. Peeling skin on a newborn baby is quite common and not usually a cause for concern. Better . This section will deal with diffuse pulmonary disease of the newborn. Radiographically, the most common appearances are mild overinflation, prominent blood vessels, perihilar interstitial shadowing and fluid in the transverse fissure with occasional small pleural effusions (Fig. There are bilateral pneumothoraces with chest drains in situ bilaterally. Case 2: congenital tracheo-esophageal fistula, see full revision history and disclosures, acute unilateral airspace opacification (differential), acute bilateral airspace opacification (differential), acute airspace opacification with lymphadenopathy (differential), chronic unilateral airspace opacification (differential), chronic bilateral airspace opacification (differential), osteophyte induced adjacent pulmonary atelectasis and fibrosis, pediatric chest x-ray in the exam setting, normal chest x-ray appearance of the diaphragm, posterior tracheal stripe/tracheo-esophageal stripe, obliteration of the retrosternal airspace, Anti-Jo-1 antibody-positive interstitial lung disease, leflunomide-induced acute interstitial pneumonia, fibrotic non-specific interstitial pneumonia, cellular non-specific interstitial pneumonia, respiratory bronchiolitisassociated interstitial lung disease, diagnostic HRCT criteria for UIP pattern - ATS/ERS/JRS/ALAT (2011), diagnostic HRCT criteria for UIP pattern - Fleischner society guideline (2018), domestically acquired particulate lung disease, lepidic predominant adenocarcinoma (formerly non-mucinous BAC), micropapillary predominant adenocarcinoma, invasive mucinous adenocarcinoma (formerly mucinous BAC), lung cancer associated with cystic airspaces, primary sarcomatoid carcinoma of the lung, large cell neuroendocrine cell carcinoma of the lung, squamous cell carcinoma in situ (CIS) of lung, minimally invasive adenocarcinoma of the lung, diffuse idiopathic pulmonary neuroendocrine cell hyperplasia (DIPNECH), calcifying fibrous pseudotumor of the lung, IASLC (International Association for the Study of Lung Cancer) 8th edition (current), IASLC (International Association for the Study of Lung Cancer) 7th edition (superseeded), 1996 AJCC-UICC Regional Lymph Node Classification for Lung Cancer Staging, 4ways diagostics, I work for this out sourcing company during non NHS hours (ongoing), differential diagnoses of airspace opacification, presence of non-lepidic patterns such as acinar, papillary, solid, or micropapillary, myofibroblastic stroma associated with invasive tumor cells. A 2019 study found that in cases when lung opacity showed cancer, pure ground-glass opacity nodules were more likely to be seen in earlier stages of lung cancer. Chest CTs are not usually done to evaluate the heart. (A) Term infant. 76-13). Cardiogenic pulmonary edema occurs when the pulmonary venous pressures are elevated because of left-sided myocardial failure or congenital lesions that impede blood flow through the left side of the heart (e.g., pulmonary vein atresia, cor triatriatum, hypoplastic left heart syndrome). Very premature infant born at 24 weeks gestation. Some medical, Dry skin is a common health problem, especially as adults age. Opportunistic infections may occur in children with HIV infection and other forms of congenital or acquired immunodeficiency. There may be mild associated cardiomegaly. Various appearances of a normal thymus in newborn. They should choose a hypoallergenic moisturizer and apply it two to three times a day. Bronchopulmonary dysplasia (BPD) or chronic lung disease is a significant long-term complication of IRDS. Most of the time, newborn skin peeling is normal. A, Congenital Lobar Hyperinflation (Emphysema). This means that the normally dark air filled lung is replaced with a whiter appearance. Mandell J. Idiopathic respiratory distress syndrome (IRDS) or hyaline membrane disease (HMD) mainly affects the premature infant less than 36 weeks gestational age. Lung abnormalities with an increased density - also called opacities - are the most common. These infants are usually full term or slightly preterm. There is bilateral asymmetrical coarse pulmonary opacification and small bilateral pleural effusions (arrows). Before the commencement of treatment, the typical radiographic features include underaeration of the lungs, fine granular opacification, which is diffuse and symmetrical, and air bronchograms (Fig. (2016, September 16). If chest radiographic differentiation between normal thymus and pathology proves difficult on the radiograph, US can help distinguish intrathymic or adjacent masses within the anterior mediastinum from a normal isoechoic homogeneous thymus. The presence of reduced vascularity in the hyperlucent areas resulting from a primary vascular pathological process, such as thromboembolism or pulmonary hypertension, is rare in children, although various congenital cardiac disorders can result in pulmonary oligaemia. A rotated patient showing a normal thymus (proven on subsequent radiograph) masquerading as a mediastinal mass. While viral pneumonias often go away with time and supportive care, pulmonary edema and cancerous perihilar infiltrates will require more specific treatment. Therefore the radiologist also uses the pattern of abnormality or opacity to determine the most likely diagnosis. Instead, a newborns skin may look dry and begin to peel off. Our website services, content, and products are for informational purposes only. not be relevant to the changes that were made. All rights reserved. What is ground-glass opacity in the lungs? At the time the article was created Rishi Agrawal had no recorded disclosures. Veronica Donoghue, Tom A. Watson, Pilar Garcia-Pea, Catherine M. Owens Perihilar infiltrates on X-ray appear as white areas around the hila. You can learn more about how we ensure our content is accurate and current by reading our. Cold air is often quite dry and can cause the skin to dry out in turn. Some abnormalities occur in a central or parahilar distribution, whereas others are predominantly peripheral or basal in location. Surfactant Dysfunction Disorders Lung opacity can show up on the imaging scan in a variety of ways, depending on the underlying condition. Pulmonary edema can cause perihilar infiltrates. This prostaglandin imbalance is also worsened in other situations like maternal diabetes or asthma, and in male newborns. 76-1) or it may exhibit the classic sail sign more commonly seen on the right side. A parent or caregiver should limit bath time to a maximum of 10 minutes and avoid using harsh soaps. This condition is also referred to as retained fetal lung fluid or wet-lung syndrome. Pediatric Radiology. no financial relationships to ineligible companies to disclose. Lung opacity can indicate different conditions that have their own treatment plans. This is usually the result of. However, other tests may be done to confirm the diagnosis or determine the type or severity of atelectasis. Additionally, pure ground-glass opacity nodules took longer to double in size than ground-glass opacity nodules with solid masses in these studies. However, parents and caregivers should look for additional signs and symptoms. The mortality rate has been improved by the use of inhaled nitric oxide, to treat severe pulmonary hypertension and also by extracorporeal membrane oxygenation (ECMO), which is used only in those infants where the conventional treatments have failed. Fluid in the lungs will be treated based on the cause. Other features of an expiratory radiograph include some degree of ground-glass opacification of the lungs and relative enlargement of the heart. Transient tachypnea of the newborn. The umbilical stump remains in situ for approximately 1-2 weeks and its presence helps to age the baby. During the saccular phase (2834 weeks) there is an increase in the number of terminal sacs, further thinning of the interstitium, continuing proliferation of the capillary bed and early development of the true alveoli. Confluent areas of consolidation are not particularly common in neonates, they usually have ground glass change or patchy opacification. This shows that they are free of blockages. First of all, have a look to see if the neonate is premature or not - signs of prematurity being reduction in subcutaneous fat and the lack of humeral head ossification (the latter occurs around term). Prolonged periods in bathwater can wash away naturally occurring oils, leaving the baby more susceptible to peeling skin. (B, C) Two axial CT slices demonstrate ground-glass opacification and septal thickening, giving a crazy paving appearance similar to the pattern typically described in alveolar proteinosis. Bilateral upper lobe segmental atelectasis. These ducts are lined by type II alveolar cells which can produce surfactant, and which differentiate into thin type I alveolar lining cells. This child was admitted to intensive care with severe respiratory distress due to influenza infection. Disorders of surfactant deficiency due to a genetic abnormality in the surfactant protein B (SpB)9 and C (SpC)10 and the ATP-binding cassette transporter protein A3 (ABCA3) can lead to interstitial lung disease. A very ill newborn with a streaky pattern in both lungs and a large unilateral right pleural effusion. Prolonged rupture of membranes prior to delivery is a major risk factor. Babies who spend more time in the womb tend to have less vernix on them at birth, meaning that their skin has had more exposure to amniotic fluid. 76-22). BlalockTaussig shunt, Constrictive bronchiolitisformerly known as SywerJames syndrome, External mass compressionmediastinal mass compressing a bronchus, Endobronchial lesione.g. Learn which ingredients to look for in a lotion and find 10 of the best lotions for dry, Medical News Today has strict sourcing guidelines and draws only from peer-reviewed studies, academic research institutions, and medical journals and associations. Perihilar infiltrates is an abnormality seen on chest X-rays and CT around the hila either on one or both sides. Looking at your newborn: Whats normal? This is located midway up the chest on the inner part of the lungs where they meet the mediastinum. Such hyperaeration may represent obstructive emphysema (, Table 50.7 Causes of Unilateral Obstructive Emphysema. Idiopathic Respiratory Distress Syndrome {"url":"/signup-modal-props.json?lang=us"}, Jones J, Bickle I, Bell D, et al. Normal Anatomy and Artefacts In TTN the normal physiological clearance is delayed. Nasogastric tube tip positions should always be reported on, in order to avoid misplacement of nasogastric feeds. These are plastic clips used to clamp the umbilicus before it is cut at birth. A higher incidence of BPD has been demonstrated in infants with previous culture-proven Ureaplasma urealyticum pneumonitis.3. Bilateral ill-defined perihilar, peribronchial opacities are the result of a viral bronchitis, accompanied by focal streaky opacity in the right lower lobe. There are multiple causes of perihilar infiltrates. It is classically described on a frontal chest radiograph but can also refer to appearances on chest CT 3,4. Typically the infants have mild-to-moderate respiratory distress without cyanosis in the first couple of hours. Perihilar infiltrates are found on imaging studies of the chest like X-rays and CT. The lack of, or reduction in, vascular markings is usually due to the presence of primary airways disease in children and the resultant homeostatic reflex vasoconstriction (Table 76-1) (Fig. Anything that causes the normal air filled dark lungs to lose this appearance and be whiter can be referred to as perihilar infiltrates. 76-19) or in some institutions inferior to L3 vertebral bodies. 11.1. ncbi.nlm.nih.gov/pmc/articles/PMC7935089/, sciencedirect.com/science/article/abs/pii/S036301881400005X?via%3Dihub, ncbi.nlm.nih.gov/pmc/articles/PMC6909955/, ncbi.nlm.nih.gov/pmc/articles/PMC7434019/, nhlbi.nih.gov/news/2020/medical-imaging-advances-may-reduce-radiation-risk-vulnerable-patients, ncbi.nlm.nih.gov/pmc/articles/PMC7350036/. congenital pulmonary airway malformation (CPAM), mass effect with contralateral mediastinal shift. The extent of the skin peeling will vary according to the babys gestational age at birth. Some pneumonias may require antibiotics while others need supportive care like viral pneumonias. What could they show you on a neonatal film? This is the principal contributor at the alveolar airfluid interface which lowers alveolar surface tension and prevents acinar collapse on expiration.1 Without this, there is alveolar collapse and, as a result, poor gas exchange, hypoxia, hypercarbia and acidosis. Unable to process the form. The prognostic significance of pure ground glass opacities in lung cancer computed tomographic images. In some cases where US is inconclusive, magnetic resonance imaging (MRI) is performed to differentiate a normal thymus from mediastinal pathology. 76-14). Sputum is a mixture of saliva and mucus. Newborn babies often have dry, peeling skin. This means we see the infiltrates on the right and left sides. It occurs when the tiny air sacs (alveoli) within the lung become deflated or possibly filled with alveolar fluid. The neonatal chest radiograph in the exam setting may strike fear into the heart of many radiology registrars, but it need not! You can learn more about how we ensure our content is accurate and current by reading our. 76-3). While confluent consolidation is not common, it may appear in an exam film. 6. In children, fluid overload tends to cause peribronchovascular oedema, which then results in overinflation of the lungs due to air trapping, along with perihilar infiltrate and upper lobe venous diversion. At the time the article was last revised Ian Bickle had the following disclosures: These were assessed during peer review and were determined to One to two layers of skin will shed in this time, mainly because the protective coating they had in the womb is no longer there. The Lungs A humidifier will increase the amount of moisture in the room. Normal Variants El-Sherief AH, et al. There are differences and similarities between RSV vs. a cold. Infant with group B streptococcus infection. Transient tachypnea of the newborn, also known as retained fetal fluid or wet lung disease, presents in the neonate as tachypnea for the first few hours of life, lasting up to one day. A doctor's examination and plain chest X-ray may be all that is needed to diagnose atelectasis. Although these patterns have traditionally been associated with viral and bacterial pathogens, studies indicate that prediction of causative pathogen using radiographic patterns is notoriously inaccurate.15 In addition viral and bacterial infection may be present simultaneously, so these classic radiographic patterns are not always accurate. Differential diagnoses of acute ground-glass opacity in chest computed tomography: Pictorial essay. The blood vessels and bronchi (airways) enter and leave the lungs here. with conditions that affect lung growth and the diagnosis is made by the pathological examination of lung tissue. If people avoid washing the vernix off the baby immediately after birth, this natural biofilm may also help the babys skin to adapt to life outside the womb. Blood was seen to ooze from the ET tube prior to obtaining the radiograph. There can be associated findings in the lungs which can help narrow the diagnosis. This reduced clearance of fluid from the lungs is why some have proposed that it is more commonly seen in cesarean section deliveries since the thoracic compression that would occur in a normal vaginal delivery does not take place. A brief resolved unexplained event (BRUE), formerly called an apparent life-threatening event, is an event in a newborn or infant lasting less than a minute that is characterized by a sudden change in one of the following: color (central cyanosis or pallor), respirations (absent, decreased, or irregular), tone (hypertonia or hypotonia), or level Summary, Veronica Donoghue, Tom A. Watson, Pilar Garcia-Pea, Catherine M. Owens, Transient Tachypnoea of the Newborn (TTN). It can also be beneficial to apply moisturizer immediately after a lukewarm bath. Pulmonary interstitial glycogenosis (PIG) may present in the preterm or term infant very soon after birth. Approximately 30% of infants will require mechanical ventilation. It can be caused by pressure outside of your lung, a blockage, low airflow or scarring. Lateral views tend only to be performed after review of the frontal radiograph, when there are unanswered clinical questions. Newborn skin peeling is usually a natural consequence of pregnancy. A patent ductus arteriosus is frequent in the premature infant and contributes to the disease. Diseases of the respiratory tract occur frequently in children. they cannot be bronchi). When the chest radiograph shows asymmetrical lung volumes, the lung with fewer vessels per unit area is usually the abnormal lung. Transient tachypnea of the newborn (TTN) appears soon after birth and has been identified as occurring with cesarean birth and infant sedation. Treatment is usually possible using home remedies, and medical intervention is rarely necessary. It may involute rapidly with prenatal or postnatal stress, for example in severe illnesses such as hyaline membrane disease or infections, or following corticosteroid treatment. This is an infiltrate that is seen only on one side around the hilum. Other etiologic agents are Pseudomonas, Enterobacter, Staphylococcus, and Klebsiella. Neonatal Pneumonia Infants with large diaphragmatic hernias usually present with severe respiratory distress immediately after birth. If you look at the film and you cannot see anything, you need to start thinking laterally. Retained fetal fluid (transient tachypnea of the newborn) Retained fetal fluid, also known as transient tachypnea of the newborn, is a diffuse lung disorder that occurs because of delayed clearance of fetal lung fluid after birth, typically in full-term neonates born via cesarean delivery. Inhalational injury, bleeding into the lungs, and certain cancers can also occasionally have this appearance. Poor inspiration may cause significant misinterpretation of the chest radiograph (Fig. Congenital bone dysplasias and syndromes associated with short ribs and a small thoracic cage (asphyxiating thoracic, The most common cause of intrathoracic compression of the fetal lungs is congenital diaphragmatic hernia. Initial treatment if required is with ibuprofen, which inhibits prostaglandin production, but surgery may occasionally be required. While symptoms may be similar, other viruses can cause a cold as well. One thing that can show on a CT scan or X-ray is a degree of haziness referred to as opacity. Bacterial pneumonia, in general, causes inflammation within the acini, resulting in oedema and intra-alveolar exudate. 76-8). The process resolves rapidly with almost complete resolution in 48 hours. Uneven aeration following surfactant administration. Water that is too hot can dry out the skin. Also, prostaglandins dilate pulmonary lymphatics to absorb excess fluid. There is almost complete 'white-out' of the lungs with air bronchograms. There is almost complete white-out of the lungs with air bronchograms. On a chest x-ray lung abnormalities will either present as areas of increased density or as areas of decreased density. bronchial carcinoid. One of the most common causes of pulmonary edema in children is acute glomerulonephritis (, Pulmonary lymphangiectasia is a rare condition that consists of dilated lymphatic channels secondary to either abnormal embryonic development of the lymphatic system or obstruction. There may be associated alterations in the pulmonary vasculature, leading to pulmonary arterial hypertension. (B) Repeat radiograph after 3 weeks reveals diffuse haziness in bilateral lung fields The autopsy findings state edema and pulmonary hemorrhage rather than atelectasis as the primary pathology. In the very premature infant, less than 27 weeks gestation, the lungs become clear following surfactant administration, but they are still immature with fewer alveoli than normal. This is usually done together with a view from the front of, Read More Lateral View Chest X-rayContinue, Please read the disclaimer In some cases, a chest X-ray can spot cancer. The tachypnea usually resolves within 48 hours. Pulmonary haemorrhage resulting in airspace opacification may also be a superimposed problem, and is usually due to severe hypoxia and capillary damage (Fig. These can usually be seen to extend beyond the lung. Please find my observations below. In the unwell neonate, it is likely that they will have lines and tubes - it is usually worthwhile dealing with these first: ET tube:estimate the distance from the carina - ensure it is not down the right main bronchus, NG tube:where is the tip? The normal thymus is a frequent cause of physiological widening of the anterior mediastinum occurring during the early years of life. The treatment will depend on the cause of the perihilar infiltrates. Respiratory infections in children are the most frequent disorders encountered by paediatricians.13 Chest radiography is the primary imaging technique used to evaluate acute lung disease. Infant with surfactant dysfunction disorder (ABCA3). (A) CXR shows bilateral interstitial, granular and fluffy opacification. Any medical information published on this website is not intended as a substitute for informed medical advice and you should not take any action before consulting with a healthcare professional. There are multiple causes of perihilar infiltrates. (B) There is almost complete resolution at 24 hours. Interstitial. 3. This entity seems inseparable from the condition described previously as WilsonMikity syndrome. A new type of BPD was described by Jobe in 19995 in immature infants with minimal lung disease at birth, and who become symptomatic during the first week of life. Oatmeal bath treatments are available in many drug stores, natural food stores, and online. Some conditions will result in multiple types of opacities. Bleeding into the lungs may be associated with coughing up blood. (A) Initial radiograph of a premature neonate born at 24 weeks of gestation, weighing 540 grams shows mild coarsening of interstitial markings (arrowheads). For more information see the dedicated page on neonatal lines and tubes. newborn. Atelectasis is one of the most common breathing (respiratory) complications after surgery. The hila are seen on the right and left sides where the lung meets the mediastinum. It is a thick viscous substance and may lead to areas of atelectasis and overinflation. Reducing exposure to cold air. The tip of an ET tube may vary considerably with head and neck movement and the correct position must therefore be assessed by taking the patients head position and the tip of the tube into consideration. Air leaks, patent ductus arteriosus and infection are contributing factors as they also prolong ventilation. Unable to process the form. Pediatr Rev. The radiographic features may, in part, be due to the inhalation of meconium itself in utero or during birth. It is most common in infants who are post-mature. They are not at risk for other illnesses. The most common cause of atelectasis is surgery with anesthesia. Infection with common viral, bacterial, and fungal organisms creates a pattern similar to that seen in immunocompetent children, but the findings tend to be more rapidly progressive and more pronounced. Ground-glass opacity is a radiological term that refers to hazy gray areas on the images made by CT scans or X-rays. Your doctor may suggest a scan of your lungs if you are experiencing: Opacities are also likely to show up on a scan if you have a history of smoking or vaping. Chest CT has, however, an important role in evaluating immunocompromised patients and both the acute and chronic complications of respiratory tract infection, such as empyema and bronchiectasis.14 A frontal radiograph is usually adequate to confirm or exclude pulmonary infection/pneumonia. There is some question as to whether these opacities represent true airspace consolidations. Radiograph obtained immediately following insertion of a veno-venous catheter in the right atrium (arrow). Consolidations with viral infections are not particularly common but can occur with more serious viral infection, such as adenovirus, influenza, parainfluenza, and respiratory syncytial virus. Air leaks are common and small associated pleural effusions may be seen. Despite recent advances in early diagnosis and management, the morbidity and mortality with this condition remains high. Progressive thinning of the pulmonary interstitium allows gas exchange with approximation of the proliferating capillaries and the type I cells. Other conditions, like alveolar hemorrhage and lung cancer, require more serious treatments. The incidence is greater in infants delivered by Caesarean section, in hypoproteinaemia, hyponatraemia and maternal fluid overload. The conditions leading to respiratory distress in the newborn infant are numerous and can be divided into those that can be treated medically and those that require surgical intervention. The subdivision refers to the size of the lucent spaces created by the intersection of lines: 76-18B and C). This can help to prevent secondary exposure to these chemicals. Such infections may result in pulmonary opacities that differ significantly from those seen with bacterial pneumonia. The tips of those inserted through the lower limbs are usually positioned at the junction of the IVC and the right atrium. Interstitial lung disease that predominates in the lower lobes can be seen with tuberous sclerosis, connective tissue diseases, and primary interstitial pneumonitis. Check for errors and try again. Cavities in the lungs of children are most often inflammatory or postinflammatory. Air Leaks Sometimes it is temporary and the result of a short-term illness. Sometimes you may cough up blood-tinged sputum. Term infant with meconium aspiration undergoing ECMO. ECMO has improved the survival of some patients by circumventing the problem of pulmonary hypertension and the right-to-left shunting of blood away from the lungs. A large, hyperlucent hemithorax most often indicates overinflation of an entire lobe or lung. Pediatr Radiol. ( a) "Sail" sign. Parents and caregivers can buy moisturizers that are particularly suitable for a babys sensitive skin. The chest radiograph may show diffuse hazy opacification initially, with the later development of interstitial shadowing which may be progressive (Fig.

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streaky perihilar opacities newborn