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Testicular cancer is a disease in which cancer cells grow in one or both testicles. The testicles (or testes) are a pair of male sex glands that produce sperm and male hormones. They are located under the penis in a sac-like pouch called the scrotum. At the top of each testis is a bunch of tiny tubules that collect and store sperm. This structure is called the epididymis. The sperm travel from the epididymis through the spermatic cord (or vas deferens) and out through the urethra during ejaculation.
Cancer occurs when cells in the body (in this case, testicular cells) divide without control or order. Normally, cells divide in a regulated manner. If cells keep dividing uncontrollably when new cells are not needed, a mass of tissue forms, called a growth or tumor. The term "cancer" refers to malignant tumors, which can invade nearby tissues and can spread to other parts of the body. A benign tumor does not invade or spread.
Undescended testes (also called cryptorchidism) and testicular atrophy are associated with testicular cancer. The link between undescended testes and testicular cancer is high. Other risk factors, such as maternal estrogen use, testicular trauma, or infection have not clearly demonstrated a correlative relationship.
Normally the testes, which are inside the abdomen before birth, migrate into the scrotu