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Abstract

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Purpose : We studied the crystallographic component of the prostatic calculi according
to the location on the transrectal prostatic ultrasonography to know the mechanism of
the formation of the calculus.
Materials and Methods: From August, 1995 until May, 1997, 33 prostatic calculi from
24 patients(mean age 59 years, mean size 3.1§®) operated on for prostatism were
analyzed by polarization microscopy(ZeissR), X-ray diffraction
(PW-1720R, Philips) and infrared spectrophotometer
(FTIR-205R, Nicolet). Location of calculi was divided two groups under
guide of transrectal prostatic ultrasonography; periurethral and periadenoma type. The
periadenoma type showed hyperechoic density around the prostatic urethra and the
periadenoma type showed hyperechoic density between adenoma and false prostatic
capsule(peripheral zone).
Results: 22 calculi were the periurethral type and 11 were periadenoma type. Thirty
stones from 20 periurethral type and 10 periadenoma type consisted two or three of the
following calcium phospate, calcium oxalate and tricalcium phospate. These are mixed by
the endogenous origin formed from the prostatic fluid and the exogenous origin formed
at least in part from urine. Three stones(2 calcium oxalate, 1 uric acid) contained only
one compound which participitate from urine. All of 11 calculi of the pericapsular type
had an oxalate component.
Conclusions: The calculi around the periadenoma region may be formed from not only
endogenous component(calcium apatite stone) but also exogenous component(calcium
oxalate) or intraductal precipitation of oxalate component which has never found in the
prostatic fluid. These results may suggest the necessity of reevaluation about oxalate
component within the prostatic fluid.

Å°¿öµå

Prostatic calculi; Crystallographic analysis;

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