How do you grade hydronephrosis?
Grade 0: no dilatation, calyceal walls are apposed to each other. Grade 1 (mild): dilatation of the renal pelvis without dilatation of the calyces (can also occur in the extrarenal pelvis) no parenchymal atrophy. Grade 2 (mild): dilatation of the renal pelvis (mild) and calyces (pelvicalyceal pattern is retained) no parenchymal atrophy. Grade 3 (moderate): moderate dilatation of the renal pelvis and calyces blunting of fornicies and flattening of papillae mild cortical thinning may be seen. Grade 4 (severe): gross dilatation of the renal pelvis and calyces, which appear ballooned loss of borders between the renal pelvis and calyces renal atrophy seen as cortical thinning.
Color Doppler study shows twinkling artifacts in the right distal ureter suggestive of calculus and demonstration of intravesical ureteric jet suggestive of partial obstruction.
There is mild to moderate right hydroureteronephrosis.