Cysts of the Lungs and Mediastinum
Clinical Vignette Assessment
A 3-week-old, full-term male infant is brought to the emergency department for progressively worsening respiratory distress over the past 24 hours. His mother reports he has been feeding poorly, seems to "work hard to breathe," and his lips occasionally look blue. He was born via uncomplicated vaginal delivery and was discharged home at 2 days of age. Vital signs: heart rate 180 bpm, respiratory rate 70 breaths/min, oxygen saturation 88% on room air. Physical exam reveals a lethargic infant with nasal flaring, subcostal retractions, and cyanosis. The chest appears asymmetric with fullness of the right hemithorax. Breath sounds are markedly diminished on the right side, with hyperresonance to percussion. The rest of the exam is unremarkable. A portable chest X-ray is obtained.
Q1: Based on the clinical presentation and physical exam findings, what is the most likely diagnosis?
Assessment Complete
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