The testes drain lymphatically to para-aortic nodes at the level of L1–L2, whereas the scrotum drains to inguinal nodes. This difference has which clinical significance?

• A Testicular carcinoma metastasises to para-aortic/retroperitoneal nodes, not inguinal nodes ✓
• B Scrotal carcinoma metastasises to para-aortic nodes
• C Both testicular and scrotal carcinoma metastasise to inguinal nodes
• D Testicular torsion causes inguinal lymphadenopathy

Explanation

The testes develop retroperitoneally from the genital ridge near L1–L2 and retain their original lymphatic drainage to the para-aortic/lumbar nodes even after descending into the scrotum; they do not acquire inguinal lymphatic connections. Testicular germ cell tumours therefore metastasise to retroperitoneal para-aortic nodes (detectable on CT of abdomen). In contrast, the scrotal skin derives from the inguinoscrotal swellings and drains to the superficial inguinal nodes. Scrotal carcinoma (rare squamous cell carcinoma) involves inguinal nodes. Inguinal lymphadenopathy in a patient with a testicular mass should raise suspicion of prior scrotal surgery breaching this lymphatic barrier.

Reference: BD Chaurasia's Human Anatomy, 8th ed.

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