Being unable to have or keep an erection adequate for sexual activity is the defining mark of erectile dysfunction. The problem may manifest itself in several ways. If the dysfunction:
Is transient or appearing only occasionally, the problem is not likely to be serious; all men experience problems with erections at some time in their lives.
Develops gradually and persistently, there is probably a physical cause; this is generally the case with chronic impotence.
Cancer: A disease that occurs when abnormal cells in a part of the body divide and grow uncontrolled.
Cavernosography: A test used in conjunction with the dynamic infusion cavernosometry (see below) that involves a dye being injected into the penis. The penis is then X-rayed and doctors are able to visualize a venous leak (see below).
Chemotherapy: In cancer treatment, chemotherapy refers to the use of drugs whose main effect is either to kill or slow the growth of rapidly multiplying cells. Chemotherapy usually includes a combination of drugs.