Peripelvic cysts (MR urography)
Suspected hydronephrosis on a routine ultrasound examination.
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Fluid-filled branching cavities in both renal pelvices with non-dilated calyces, suggestive of peripelvic cysts.
Excretory MR urography (3D FSPGR), shows the smooth mass effect upon the renal calyces, which are proved not to be dilated.
Note: This case has been tagged as "legacy" as it no longer meets image preparation and/or other case publication guidelines.
The fluid-filled branching cavities in both renal pelvices are not dilated calyces, but peripelvic cysts, as could be proven by MRU.