Recurrent Pericardial Effusions and Pericarditis Due to Yellow Nail Syndrome

A 79-year-old woman presents with recurrent pericardial and pleural effusions for several years. She was noted to have exudative pleural effusions and bilateral nailbed discoloration. The constellation of her presenting symptoms and existing physical examination findings revealed a diagnosis of yellow nail syndrome, a rare cause of recurrent pericardial effusions. (Level of Difficulty: Advanced.).