The presence of mast cells in eosinophilic pleural effusions.
D000328:Adult; D002294:Carcinoma, Squamous Cell / Q000150:complications; D004804:Eosinophils; D006801:Humans; D008175:Lung Neoplasms / Q000150:complications; D008297:Male; D008407:Mast Cells / Q000473:pathology*; D010996:Pleural Effusion / Q000097:blood / Q000166:cytology*