Primary testicular diffuse large B-cell lymphoma with gonadal vein tumor thrombus: A case report and review of the literature

Figure 1 ¹⁸F-fluorodeoxyglucose positron emission tomography/computed tomography and contrast-enhanced computed tomography images. A: Linear uptake along the left gonadal vein (arrow, SUVmax 16.5); B: Bilateral testicular lesions (left: SUVmax 14.1; right: SUVmax 5.0); C: Paravertebral lymph node uptake (arrow); D: Mediastinal lymph node uptake (arrow); E: Right supraclavicular lymph node uptake (arrow); F and G: Tumor thrombus in the left gonadal vein near the left renal vein (arrow); H and I: Tumor thrombus in the left spermatic cord (arrow).

Figure 2 Pathological findings of left testis tumor. A: Orchiectomy specimen showing an enlarged testis and spermatic cord tumor; B: Lymphatic cellular infiltration with monomorphic, medium-to-large round cells and nuclear pleomorphism, H&E (× 40). C-G: Immunohistochemistry findings. C: MUM1 (× 20, weak positive); D: CD10 (× 20, negative); E: BCL6 (× 20, negative); F: CD20 (× 20, strong positive); G: Ki-67 (× 20, approximately 80% positive, high proliferation rate).