Prostatic calculi (stones) are very common. They aren't always
apparent during a rectal exam or on X-rays.
Prostate stones are usually tiny—about the size of poppy seeds—and do
not cause symptoms.
In some men, infected prostate stones may cause recurrent
urinary tract infections (UTIs) and make it hard
to cure bacterial
prostatitis. The stones may have to be removed with
surgery before UTIs or chronic prostatitis can be resolved.