Metastatic seminoma in the duodenum: diagnosis with endoscopy followed by successful treatment.

Seminomas rarely metastasize to the gastrointestinal tract. In general, these lesions metastasize to the lungs or retroperitoneal lymph nodes. A 34-year-old Japanese man who had undergone orchiectomy for seminoma two years earlier experienced shortness of breath and tarry stools. The patient presented at our hospital and was diagnosed with metastatic seminoma to the third portion of the duodenum on double balloon endoscopy. He was effectively treated with chemotherapy and continues to progress well, with no episodes of recurrence.