[Primary testicular lymphoma with extranodal involvement in the stomach. Case report].

Background: Primary testicular lymphoma is a rare disease that usually occurs in men over 50 years of age. It is considered a highly aggressive disease with a poor prognosis due to the high rate of relapse in different extranodal sites. In this report, we present a case of primary testicular lymphoma with extranodal involvement in the stomach. Clinical case: 57-year-old male patient with a right testicular enlargement of one month which was treated as right epididymitis-orchiditis without improvement, for which an ultrasound was requested with the finding of a tumor in the right testicle. He came to the National Medical Center's Oncology Hospital where a plain and contrast thoraco-abdominopelvic computed tomography scan was requested with no evidence of metastasis in the retroperitoneum and with negative tumor markers. Patient underwent a right radical orchiectomy via the inguinal route, with a pathology report of testicular lymphoma. The following postoperative day, the patient presented data of lower digestive tract bleeding, so a panendoscopy with biopsy was requested, finding a 6 cm bleeding gastric ulcer compatible with gastric lymphoma by immunohistochemistry. Conclusions: The early diagnosis of a probable testicular lymphoma is crucial, since, although germ cell tumors are the main etiology, in patients over 50 years of age there should always be suspicion of a testicular lymphoma that may benefit from chemotherapy treatment.