Clear cell mesothelioma presenting as an incarcerated abdominal hernia.

A clear cell mesothelioma presenting as an incarcerated ventral abdominal hernia in a 67-year-old man who had no history of asbestos exposure is described. The cause of the cytoplasmic clearing was the presence of large amounts of glycogen. Although uncommon, this variant of mesothelioma is important to recognize because it can be easily confused with other clear cell tumors involving the serosal membranes. Significant recent advances in the immunohistochemistry of epithelioid mesothelioma are briefly reviewed because immunohistochemical studies can be helpful in establishing the correct diagnosis.