Thoracoscopy in the diagnosis and management of recurrent pleural effusions.

Between April 1984 and July 1988, 102 patients with persistent or recurrent pleural effusions investigated by conventional methods in whom a diagnosis had not been achieved were submitted to thoracoscopy under general anesthesia. A positive diagnosis was obtained in 80.3% of the patients. The procedure was well tolerated, and although some of these were seriously ill patients, there were no procedure-related deaths.