Introduction: Malignant mesothelioma of the tunica vaginalis testis is a rare tumour. Since the first case report, fewer than 175 cases have been reported to date. Most of these cases presented with nonspecific symptoms, such as a painless scrotal mass associated with hydrocele. The pathogenesis of this malignant neoplasm is unclear and is mostly related to asbestos exposure, as well as a long-lasting hydrocele. An early pre-operative diagnosis is difficult to obtain, and few cases have even been suspected to be mesothelioma. We hereby report a case of malignant mesothelioma of the tunica vaginalis that was diagnosed preoperatively by scrotal hydrocelectomy.
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