title: Metastatic seminoma with regression of testicular primary: ultrasonographic detection.
abstract: We report a case of seminoma of the testis metastatic to the retroperitoneum. Biopsy of the retroperitoneal mass revealed anaplastic seminoma. No testicular mass could be palpated. Testicular ultrasonography showed a hypoechoic 3 X 2 cm. area in the left testis suggestive of a primary testicular tumor, most likely a seminoma. Histological evaluation of the resected testis revealed fibrous tissue but no definable tumor.
mesh_terms: D000328:Adult; D004407:Dysgerminoma / Q000175:diagnosis / Q000556:secondary*; D006801:Humans; D008297:Male; D012186:Retroperitoneal Neoplasms / Q000556:secondary*; D013736:Testicular Neoplasms / Q000175:diagnosis*; D014463:Ultrasonography