Ultrasound appearance of hydronephrosis. a SFU grade 0; b SFU grade 1; c SFU grade 2; d SFU grade 3; e SFU grade 4; f transverse plane with AP diameter indicated by white cross-marks
Grade 1 represents a split pelvis, grade 2 is further
dilation of the renal pelvis, with a few visualized calyces
permissible, grade 3 is renal pelvis dilation, with many
distended calyces, and grade 4 is a grade 3 appearance
with the addition of thinned parenchyma (Fig. 1 a–e). .
While SFU grading is more common in North America, AP diameter
measured in the transverse view of the kidney is more prevalent
outside of North America (Fig. 1 f).
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