Common causes of pleural effusion in referral hospital in Isfahan, Iran 1997-1998.

During a one-year period to September 1998, data were collected from all 213 patients referred with pleural effusion. There were 132 males and 81 females; their ages ranged from 18 to 85 years. The most common etiologies of effusion were congestive heart failure (39.4%), malignancy (27.2%), pneumonia (8%), empyema (5.2%), and tuberculosis (5.2%). Pleural effusions are frequent in Iran, and the causes are fairly similar to those reported by European authors, but with slightly more tuberculosis cases, mostly among Afghan refugees.