Frequently Asked Questions About Testicular Cancer  Testicular
Cancer FAQ  Q: What is testicular cancer?  A: Testicular cancer
is cancer that starts in the testicles. The testicles are two
male reproductive organs that hang below the penis in a sac
called the scrotum.  Illustration of  the anatomy of the male
reproductive tract Click Image to Enlarge  In adult males, each
testicle is usually slightly smaller than a golf ball. The
testicles make several hormones, mainly testosterone. They also
make reproductive cells called sperm. There are different kinds
of cells in each testicle, each of which can grow into one or
more types of cancer.  About 8,590 men in the United States will
be diagnosed with testicular cancer in 2012. Overall, testicular
cancer is not that common. However, it is the leading cause of
cancer in men in their twenties and thirties. Some doctors
recommend performing testicular self-exams to help find
testicular cancer in its early stages, when it is most
treatable, although it's not clear if