Monday, September 10, 2012

Cystic Lesions of the Renal Sinus

Peripelvic Cysts
  • multiple benign cysts arising in the renal sinus (extraparenchymal)
  • likely originate from sinus lymphatics
  • usually bilateral
  • may mimic hydronephrosis on US and NCECT but cannot be traced to the ureter
  • indistinguishable from renal sinus lipomatosis on excretory urography

Parapelvic Cysts
  • simple cysts originating from the medial renal parenchyma
  • same imaging features as simple renal cysts (Bosniak I)
  • usually asymptomatic but a large parapelvic cyst that compresses the renal vasculature/collecting system may cause hypertension, hematuria, and hydronephrosis

Rha SE, Byun JY, Jung SE, et al. The renal sinus: pathologic spectrum and multimodality imaging approach. Radiographics 2004;24:S117-31.

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