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Simple renal cysts

Case contributed by David Puyó

Patient Data

Age: 75 years
Gender: Male

Hypoattenuating renal cysts characterized as homogeneous thin-walled and nonenhancing fluid-attenuation lesions.

Small simple hepatic cyst is seen at segment 6.

Enlarged prostate.

Case Discussion

Cystic renal lesions are common, increasing in prevalence with the patient’s age. 

The Bosniak classification system for CT evaluation of renal cysts is helpful in determining both malignant risk and required followup / treatment.

Hypoattenuating cysts characterized as homogeneous thin-walled, non-enhancing fluid-attenuation lesions are classified on Bosniak category I (simple renal cysts), and are rarely problematic when encountered incidentally at contrast-enhanced CT. 

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