Malignant mesothelioma of the testicular tunic

Mesotheliomas are neoplasms arising from the serous membranes lining the body cavities. One such cavity, the tunica vaginalis propria testis, is a common site for development of the benign mesothelioma, the adenomatoid tumor. However, the malignant mesothelioma is a rare neoplasm in this region. We report a case of a malignant mesothelioma of the testicular tunic. We review briefly the history of malignant mesothelioma, compare it with the adenomatoid tumor and discuss the possible embryologic histogenesis of these tumors.