Bosniak cyst - type IV

Case contributed by Dr Ian Bickle

Presentation

Complex left renal cyst on ultrasound. CT to assess.

Patient Data

Age: 55 years
Gender: Male
CT

Complex enhancing mass at the lower pole of the left kidney, with a necrotic center.

Diagram

The full Bosniak classification

Case Discussion

Exophytic part solid-part cystic lesion in the lower pole of the left kidney.  The solid components enhance.

The appearances are those of a type IV Bosniak cyst, 100% of which are malignant.

Image guided renal biopsy was performed.  It was a renal cell carcinoma.

The patient declined treatment.

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.