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J Korean Radiol Soc. 1980 Jun;16(1):177-182. Korean. Original Article.
Shin OJ , Chin SY .

Each organ of body has many normal variations and/or abnormal developments from fetus to adult, especiallyurogenital system is very complex and markedly abnormal. The authors attempt to analyze the natures, incidencesand differencies of each normal variations based on I,V.P. series of 1000 Korean females and the review ofliteratures were carried out. The results are as follows; 1. The normal variations of urinary tracts are about 30kinds as follows; A plasia 0/1000(0%), Hypoplasia 4/1000(0.4%), Atrophic kidney 0/1000(0%), Hyperplasia0/1000(0%), Hypertrophied kidney 1/1000(0%), Supernumerary kidney 0/1000(0%), pelvic kidney 0/1000(0%), Wanderingkidney 7/1000(0.7%), Horseshoe kidney 2/1000(0.2%), Nephroptosis 6/1000(0.6%), Malroated kidney 0/1000(0%),Crossed ecotopic Kidney 0/1000(0%), Ureteral kingking 440/1000(44.0%), Short ureter 3/1000(0.3%), Lon ureter49/1000(4.9%), Retrocaval ureter 0/1000(0%), Retroiliac ureter 0/1000(0%), Mega-ureter 0/1000(0%), Aberrant vesselin ureter 79/1000(7.9%), Congenital ureteral valves 0/1000(0%), Anomalous ureter orifices 0/1000(0%), Doubleureter 22/1000(2.2%), Ureteral diverticulum 0/1000(0%), Extrarenal pelvis 170/1000(17.0%). Intrarenal pelvis830/1000(83.0%), Supernumerary pelvis 55/1000(55.0%), Renal backflow 2/1000(0.2%), Multiple calyces 1/1000(0.1%),Calyceal diverticulum 2/1000(0.2%), unilateral fused kidney 0/1000(0%), Polar enlarged kidney 0/1000(0%). 2. Theorder of incidence of common variations in Korean females are as follows; 1. Intrarenal pelvis 2. Ureteralkingking 3. Extrarenal pelvis 4. Aberrant vessel in ureter 5. Double pelvis 6. Long ureter 7. Double ureter 8.Wandering kidney 9. Nephroptosis 10. Hypoplasia 11. Short ureter 12. Horseshoe kidney 13. Renal backflow 14.Calyceal diverticulum 15, Supernumerary calyces. 3. The most common variations in Korean females are intrarenalpelvis, extrarenal pelvis, aberrant vessel in ureters and most of them are acquired origin. Contrary, those inforeigners are double pelvis and double ureter resulting from congenital origin and the pattern is different fromKoreans. 4. The most rare variation is multiple calyces in Korean females.

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