[Mesothelioma of the tunica vaginalis testis]

We report on a mesothelioma of the tunica vaginalis testis in a 33-year-old patient. Eleven years following tumor removal, the patient is well and no evidence of tumor has been observed. We describe the pathologic features of the tumor, and discuss the characteristic, constant, but unspecific presenting features of mesotheliomas that are uncommon to this site, and the major difficulties encountered in making a differential diagnosis.