Melanoma: The most dangerous form of skin cancer, a malignancy of the melanocyte, the cell that produces pigment in the skin.
Statistically, the probability of having a prostate cancer present with a PSA of between 4 and 10 is around 22 per cent. Once the PSA level rises above 10, the probability goes up to the order of 64 per cent.
Transrectal ultrasound is often used to guide the needle to the correct spot. A prostate biopsy is usually done with a spring-loaded needle. The needle quickly enters the prostate gland and removes a tissue sample. Between 6 and 12 samples are taken from different areas of the prostate. The biopsy can also be done with a needle guide attached to your doctor's finger. He or she inserts the finger into your rectum. Then the needle slides along the guide, through the wall of the rectum, and into the prostate gland.