Eosinophilic pleural effusion due to mesalamine. Report of a rare occurrence

Mesalamine-induced lung toxicity has often been described. We report on a c ase of a patient who underwent mesalamine treatment, though in the absence of established criteria required for diagnosing Crohn's disease (CD) or ulc erative colitis (UC). He developed an adverse respiratory reaction to the d rug, thus definitely proving its lung damaging capacity. The clinical prese ntation included eosinophilic pleural effusion, a feature never previously described in association with mesalamine intake.