Adenocarcinoma of the prostate is the clinical term for a cancerous tumor on the prostate gland. As prostate cancer grows, it may spread to sac-like structures attached to the prostate (seminal vesicles), to tissues near the prostate, the interior of the gland, and to distant parts of the body (bones, liver, lungs, etc).
The prostate gland is located in the pelvis, below the bladder, above the urethral sphincter and penis, and in front of the rectum in men. It is made up of glandular tissue and muscle fibers that surround a portion of the urethra. The gland is covered by a membrane (called the prostate capsule) that produces prostate-specific antigen (PSA).
Early prostate cancer is usually discovered during a routine digital rectal xamination (DRE).