Nonmalignant mesothelioma is usually a localized tumor that affects men more frequently than women.
The tumor may grow to a large size and compress the lung, causing the symptoms of shortness of breath . This type of tumor is rare and does not appear to be related to previous asbestos or other exposure. The incidence is 5 out of 1,000,000 people. A physical examination reveals the clubbed appearance of the fingers. The outcome is expected to be good with prompt treatment.