Eosinophilic pleural effusion due to infection: A case report.

Eosinophilic pleural effusion is rare, and the cause is often obscure. A 73-year-old man with no relevant medical history presented with exertional dyspnea. Chest imaging revealed left-sided pleural effusion, and pleural fluid examination revealed eosinophilic pleural effusion. Blood tests revealed an increased peripheral blood eosinophil count and elevated Immunoglobulin E levels. was detected in pleural specimens collected via thoracoscopy. Antimicrobial therapy targeting resolved the eosinophilic pleural effusion and elevated peripheral blood eosinophil count. infection may be considered as a cause of eosinophilic pleural effusion when the diagnosis is difficult.