Template:Grading of hydronephrosis
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Hydronephrosis grading
_grading_of_hydronephrosis.jpg)
The Society of Fetal Ultrasound has developed a grading system for hydronephrosis, initially intended for use in neonatal and infant hydronephrosis, but it is now used for grading hydronephrosis in adults as well:[1]
- Grade 0 – No renal pelvis dilation. Cutoff values for different patient populations are:
- Fetuses: An anteroposterior diameter of less than 4 mm in fetuses up to 32 weeks of gestational age and 7 mm afterwards.[2]
- Adults, defineddifferently by different sources, with anteroposterior diameters ranging between 10 and 20 mm.[3] About 13% of normal healthy adults have a transverse pelvic diameter of over 10 mm.[4]
- Pregnant women in the last two trimesters: The maximum normal expected renal pelvic diameter (97.5 percent prediction interval) is 27 mm on the right and 18 mm on the left.[5]
- Grade 1 (mild) – Mild renal pelvis dilation (anteroposterior diameter less than 10 mm in fetuses[2]) without dilation of the calyces nor parenchymal atrophy
- Grade 2 (mild) – Moderate renal pelvis dilation (between 10 and 15 mm in fetuses[2]), including a few calyces
- Grade 3 (moderate) – Renal pelvis dilation with all calyces uniformly dilated. Normal renal parenchyma
- Grade 4 (severe) – As grade 3 but with thinning of the renal parenchyma
