Parapelvic and peripelvic cysts

  • Occur in renal sinus
  • Causes sinus distortion but no obstruction
  • Peripelvic: lymphatic origin
  • Parapelvic: serous cysts arising from renal parenchyma present in the sinus
  • Important to distinguish from hydronephrosis – dilated infundibula are not seen to connect to a dilated renal pelvis
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Hidalgo, H., et al. “Parapelvic cysts: appearance on CT and sonography.” American Journal of Roentgenology 138.4 (1982): 667-671.