Testicular cancer

Testicular cancer is cancer that develops in the testicles, a part of the male reproductive system.

Not all lumps on the testicles are tumors, and not all tumors are malignant (cancerous). There are many other conditions, such as testicular microlithiasis, epididymal cysts, and appendix testis (hydatid of Morgagni), which may be painful but are non-cancerous.