Scrotum • In men, the pouch of skin that contains the testicles (balls).

Second opinion • Term used by insurance and medical experts to mean asking another doctor to review your case and the treatment proposed for you.

Seed implant (brachytherapy) • Radiation therapy in which a radiation source is placed in the prostate.

Semen • Male sex fluid.

Seminal vesicle • A small sac attached to the prostate that holds sperm. Cancer may spread there.

Stage • With cancer, the stage describes how much a cancer has probably spread.