Wally has just been told that he has an enlargement of the walnut-sized gland at the base of his urethra. this gland is called the:

Prostate gland

The prostate gland is a small walnut sized gland that encircles the first part of the urethra which moves urine from the bladder along the penis. A thick white fluid is produced by the prostate and this fluid combines with the sperm from the testicles to form semen. The semen is turned into liquid by a protein called prostate-specific antigen (PSA) which is produced by the prostrate.

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