Urinothorax: a rare cause of pleural effusion.

There are many benign causes of pleural effusions that can be followed expectantly. This case report will detail a rare cause of pleural effusion. The evaluation of this patient led to a diagnosis of urinothorax. This case will highlight the importance of a thorough history and physical, as well as diagnostic evaluation of effusions of unknown etiology. With the increasing number of urological procedures being performed, it will likely become a more frequent finding.