Abstract
A case of malignant mesothelioma arising from the tunica vaginalis propria testis is described. The nature of this tumor is evidenced by in situ malignant change of the mesothelial lining as well as by extensive lymphatic and local tissue invasion. This is the first report of a malignant mesothelioma of the tunica vaginalis associated with asbestos exposure and may be epidemiologically as well as clinically important.