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Prostatic calculi are common and are associated with inflammation of the prostate. Recently, it has been suggested that this inflammation may be associated with prostate carcinogenesis.
Exogenous calculi come from urinary salts and may originate as ureteral or bladder stones and become lodged in the prostatic urethra. In a sense they are not true prostatic stones, but they have been classed as such. This type of stone has been seen after prostatectomy and may become quite large.