图示间皮瘤，致密的白色环状肿块从胸膜脏层长出。一些大的肿块能充满胸腔。间皮瘤危险因素是接触石棉。相反在接触石棉的人中间皮瘤很少见。石棉肺易引起支气管癌，它使患癌的风险增大5倍。吸烟使患肺癌的风险增大10倍。因此,具有石棉接触史的吸烟者患肺癌风险增大了50倍。
The dense white encircling tumor mass is arising from the visceral pleura and is a mesothelioma. These are big bulky tumors that can fill the chest cavity.The risk factor for mesothelioma is asbestos exposure. However, mesothelioma is rare even in persons with asbestos exposure. Asbestosis more commonly predisposes to bronchogenic carcinomas, increasing the risk by a factor of five. Smoking increases the risk for lung cancer by a factor of ten. Thus, smokers with a history of asbestos exposure have a risk 50 fold greater likelihood of for developing lung cancer.
