The Society for Fetal Urology (SFU) has developed a grading system for hydronephrosis in a fetus or neonate.
Parameters seen on ultrasound:
(1) central renal echo complex and renal pelvis
(3) renal parenchyma
central renal echo complex closely apposed (no hydronephrosis)
slight separation of the central renal echo complex
further dilatation of the renal pelvis
one to a few renal calices can be seen
renal pelvis dilated
multiple fluid filled calices throughout the kidney
renal parenchyma shows normal thickness
renal parenchyma over the calices is thinned
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Specialty: Nephrology, Clinical Laboratory