A 16-year-old adolescent male presented to his primary care physician with a low-grade fever and symptoms consistent with an upper respiratory tract infection. Over the next 3 months, he received 2 courses of azithromycin and albuterol. His cough never resolved, and he developed worsening dyspnea on exertion. He was finally admitted to an outside hospital, where a chest X ray revealed bilateral pleural effusions and an enlarged heart. Pleural and pericardial effusions were confirmed on CT.His dyspnea on exertion and radiological findings prompted the placement of bilateral chest tubes followed by mechanical ventilation for 5 days. After an echocardiogram, a pericardiocentesis without concurrent cardiac catheterization drained 127 mL of fluid. No active bacterial, fungal, or viral infections were found. He was also treated with stress-dose steroids. He was transferred to Johns Hopkins Hospital with massive pleural fluid output of 3 to 5 L per day.His past medical history was significant for ADHD, gastroesophageal reflux disease, milk protein allergy, and allergic colitis as an infant. He had been diagnosed with constitutional growth delay with, his height and weight were below the fifth percentile. His family history and social history were unremarkable.On physical exam, he appeared fatigued and had an increased work of breathing. His respiratory rate was 23 breaths per minute with a room air oxygen saturation of 100%. His heart rate was 125 bpm, with a normal blood pressure. The lower lung breath sounds were decreased bilaterally. Jugular venous distention was not visible. He had a quiet precordium with a normal heart exam but for tachycardia. His abdomen was distended and demonstrated shifting dullness. He had no lower-extremity or sacral edema.Pleural fluid studies revealed a pleural fluid-to-serum LDH (Lactate dehydrogenase) ratio of less than 0.6, fulfilling Light's criteria characteristic of transudate. 1 LDH was 124 U/L, less than two thirds the upper limit of normal. The pleural fluid-to-serum protein level was just greater than 0.5 at the outside hospital but was less than 0.5 at Johns Hopkins. Laboratory studies at the outside hospital and at Johns Hopkins were remarkable for a negative infectious disease workup and no signs of rheumatological disease or oncological disease. His liver function tests were abnormal on admission (Table 1).An ECG, an echocardiogram, a thoracic and abdominal CT, and an abdominal ultrasound revealed a low-voltage QRS, a small pericardial effusion, bilateral areas of consolidation in the left and right lower lobes, large amounts of ascites, and patent hepatic vasculature with normal liver echotexture. A trial of stress-dose steroids did not improve his symptoms as 3 to 5 L/d of pleural fluid continued to drain from his chest tubes daily.A follow-up echocardiogram 1 week later revealed impaired diastolic dysfunction, which led to a right and left heart catheterization with pressures consistent with constrictive pericarditis. A retrospective review of the first echocardiogram sho...