Benign cortical cyst of the kidney

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Benign cortical cyst of the kidney
Diagnosis in short

Benign cortical renal cyst with papillary projections. H&E stain.

LM simple epithelial lining without atypia, may have clear cells
LM DDx localized cystic disease of the kidney, cystic neoplasms/renal cell carcinoma (e.g. cystic clear cell renal cell carcinoma), multicystic renal cell neoplasm of low malignant potential, other cystic kidney diseases
Gross thin-walled cyst in the renal cortex, usually filled with serous fluid, usually unilocular
Site kidney - see cystic kidney diseases

Prevalence very common
Radiology simple cyst with thin wall; usually Bosniak I or II - see Bosniak classification of renal cysts
Prognosis benign
Treatment none

Benign cortical cyst of the kidney is an extremely common benign kidney finding.

Benign renal cyst redirects here. A more general discussion about cysts in the kidney is in the article cystic kidney diseases.


  • Very common.
  • Benign.


  • Thin-walled cyst - usually filled with serous fluid.
  • Usually unilocular.



  • Simple epithelial lining without atypia.
  • May have clear cells.


  • Do not have clear cells within the wall of the cyst.[1]



See also


  1. Epstein, Jonathan I.; Netto, George J. (2014). Differential Diagnoses in Surgical Pathology: Genitourinary System (1st ed.). Wolters Kluwer. pp. 197. ISBN 978-1451189582.