Prostatic calculi are classified as exogenous or endogenous, depending on the point of origin. 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. Deposition of urinary salts in prostatic diverticula may also lead to formation of calculi in the prostate. These stones are frequently seen during endoscopic examinations and are often just below the mucous membrane of the prostatic urethra. True prostatic stones, on the other hand, are found in the deeper structures of the prostate and are usually multiple. One case has been reported in which there were 1,247 stones, and in other reported cases several hundred calculi have been found at operation. Although true prostatic calculi
McDonald HP, Upchurch WE, Sturdevant CE. TREATMENT OF PROSTATIC CALCULI. JAMA. 1955;157(10):787–788. doi:10.1001/jama.1955.02950270005002
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