An interesting case of a young man who presented with abdominal pain associated with urinary urgency. An ultrasound suggested a cystic mass in the pelvis posterior to the bladder. When I examined the patient, I could feel a mass but not the prostate. MRI scan confirmed a midline 8cm cystic mass posterior to the bladder. We suspected Mullerian duct cyst which is often associated with renal genesis. So a CT scan was done and indeed this showed absent left kidney!