[Malignant mesothelioma. Diagnosis and treatment].

In over 90% of cases, mesothelioma initially presents as a banal pleural effusion, contributing no orientation to the diagnosis. The pleural fluid can even disappear after initial puncture. For early diagnosis, simple puncture, with or without biopsy, does not suffice. Thoracoscopy is 98% diagnostic. The course depends on the stage, the histological type and the general status. A new international TNM classification has been proposed to allow comparison of series and to choose a treatment appropriate to the stade: at stage I, intrapleural, local immuno-chemotherapy treatment gives good results; at stages II and III, surgery followed by radiation therapy are indicated; at stage IV, symptomatic treatment alone is justified.