A RARE PRESENTATION OF UNILATERAL RENAL AGENESIS AS RETROPERITONEAL CYST OF METANEPHRIC ORIGIN A CASE REPORT

Unilateral Renal Agenesis (URA) occurs more frequently than bilateral renal agenesis but is not easily detected from findings on physical examination. Most autopsy series suggest that unilateral renal agenesis occurs once in 1100 births. Retroperitoneal cysts are uncommon, with an estimated incidence of 15750 to 1250,000. A 49 years male patient was admitted with vague abdominal pain and gradually increasing abdominal distension. Clinical examination and investigations confirmed unilateral renal agenesis and retroperitoneal cyst. He underwent surgery and was discharged after making good recovery. Retroperitoneal cysts and its association with Unilateral Renal Agenesis are very rare, and mostly they are discovered incidentally. Patients may be asymptomatic or present with abdominal pain, abdominal distension or weight loss. Imaging may help to diagnose these lesions, but surgery is the keystone in confirming the diagnosis. This case is very rare as it highlights an unusual presentation of unilateral renal agenesis as a retroperitoneal cyst of meanephric origin.