Parapelvic Simple Renal Cyst Mimicking Hydronephrosis on MRI

Clinical History

A 74-year old man had an MRI of his spine which revealed an area of possible hydronephrosis in his right kidney. An ultrasound of his kidneys was requested to confirm this.

Case Description

Ultrasound revealed a 6 cm parapelvic simple cyst in the lower pole. There was also another 2 cm simple cyst adjacent to the former.

Treatment/ Follow up

These findings were confirmed by an outpatient contrast CT scan of the urinary tract carried out months later.