Testicular cancer is a malignant tumor that originates in the testicles and can sometimes spread to other parts of the body. This disease begins with the uncontrolled proliferation of cancerous cells in the tissues of a testicle. It is generally the most common type of cancer among men aged 20 to 35, and when diagnosed early, it can be treated with a high success rate.

According to data, 52.3% of testicular cancers occur in the right testicle, while 47.7% occur in the left testicle. The development of cancerous cells in both testicles simultaneously is very rare, accounting for only 2-3% of cases.