An elusive etiology of upper gastrointestinal bleeding in a young man: testis tumor.

Herein, we present a case of testicular tumor in a young patient in whom the initial symptom was upper gastrointestinal bleeding secondary to duodenal invasion by retroperitoneal lymph node involvement. Although melanoma, renal, breast, bronchogenic, and gastric carcinoma are the most common metastatic tumors of the small bowel, testicular tumors should be considered in the differential diagnosis of duodenum invasion in a young man because they are the most common tumor in this age group.