A 50-Year-Old Man With a History of Recurrent Exudative Right-Sided Pleural Effusion.

In this case report, we describe a 50-year-old man who presented to our facility for a second opinion after a year-long history of recurrent and now persistent right-sided exudative pleural effusion. On review of previous records, negative findings were seen in microbiological studies, including acid-fast bacilli, cytology, flow cytometry, and pleural biopsy using video-assisted thoracoscopy. On transthoracic echocardiography performed during our evaluation, the expected respiratory variations across the mitral and tricuspid valves were not appreciated. This necessitated subsequent cardiac workup via magnetic resonance imaging, which showed a small pericardial fluid, thickened pericardium, and a septal bounce. The patient was surgically treated using a phrenic-to-phrenic pericardiectomy, following which his symptoms resolved completely. Pleural effusions occur in approximately 40-60% of patients with constrictive pericarditis, and despite the known association of pleural effusions with constrictive pericarditis, the diagnosis of constrictive pericarditis is not readily entertained in patients with undiagnosed pleural effusions.