Abstract
Malignant mesothelioma is an aggressive tumor arising from thoracic pleura or abdominal peritoneum. It is often associated with asbestos exposure. Malignant mesothelioma of the tunica vaginalis testis is extremely rare and is usually associated with trauma or asbestos exposure. It always presents as an inguino-scrotal mass and can mimic hydrocele in pre-operative imaging. A 77-year-old man with no history of asbestos exposure or trauma presented with a 3-month history of a mass in the right side of the scrotum. A pre-operative sonogram revealed a thick-walled hydrocele. Although intraoperative frozen-section analysis of the wall of the hydrocele revealed no malignancy, an orchiectomy was performed because of the presence of a white-to-yellowish excretion found during incision and history of left hydrocelectomy. Histolopathologic examination of the resected testis confirmed a malignant mesothelioma of the tunica vaginalis testis. There was no evidence of recurrence at 6-month follow-up.
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