What Is Malignant Pleural Mesothelioma?

Mesothelioma is a benign (noncancerous) or malignant (cancerous) tumor affecting the mesothelium, which is a type of protective sac that covers internal organs. Most cases begin in the pleura (lining around the lungs) or peritoneum (the lining around the abdomen).

Malignant pleural mesothelioma is a type of mesothelioma in which cancer cells begin to grow in the pleura. Most people who develop this condition have worked on jobs where they inhaled asbestos particles.