I-Number
1-Renal agenesis
2-Supernumerary kidney
II-Fusion
1-Horseshoe kidney: most common ***********
2-Cross fused renal ectopia
3-Pancake kidney “krep böbrek”
4-Supernumerary kidney “fazladan böbrek”
III-Location
1-Pelvic kidney
2-Crossed renal ectopia (fused or unfused)
3-Abnormal renal rotation (renal malrotation)
4-Nephroptosis (floating kidney)
5-İntrathoracic kidney
IV-Shape
1-Persistent fetal lobulation
2-Hypertrophied column of Bertin
3-Hilar lip “dudak”
4-Dromedary hump “deve hörgücü”
V-Vasculature
1-Multiple renal arteries: common; present in ~30% of patients 1
2-Renal vein anomalies
a-Retroaortic or circumaortic left renal vein
b-Supernumerary renal veins
VI-Collecting System
1-Duplex collecting system: most common (overall)
2-Bifid collecting system
Retrocaval ureter