Lymphatic drainage

Lymphatic drainage from the testes drains to the lumbar and para-aortic nodes at L1. Therefore, testicular cancers or infections (orchitis) may not lead to palpable lymphadenopathy. This also affects the surgical approach for testicular cancer with surgery taking place via the groin rather than taking a scrotal approach. 

Lymphatic drainage from the scrotum drains to the superficial inguinal nodes.