Abstract: Xanthogranulomatous orchiepididymitis (XGO) is a rare inflammatory and destructive disease of the testis that may simulate testicular malignancy. To the authors' knowledge only 19 cases of XGO have been previously reported. Herein is reported the case of a 52-year-old man with XGO who presented with a left testicular mass and pyogenic discharge from the scrotum. Ultrasound examination indicated heterogeneous testicular areas suggestive of neoplasia. Testicular tumor markers were normal. Orchidectomy was performed and histopathology showed XGO and a concurrent, occult typical seminoma. As far as the authors know the coincidence of these two lesions has not been documented previously. XGO may mimic testicular malignancy and may coexist with it. Pathologists should be aware of this concurrence of lesions to avoid potential misdiagnosis. Wide sampling of the orchidectomy specimens with XGO is mandatory to exclude an occult seminoma.

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