A RARE CASE OF PRIMARY RETROPERITONEAL CYST

The Retroperitoneal cysts are very rare, and most of the time they are discovered incidentally. Retroperitoneal cysts are uncommon, with an estimated incidence of 1 in 250,000.A Forty year old female presented with complaints of pain for six months with history of loss of appetite and history of weight loss. She was a known Diabetes mellitus and Bronchial asthma on treatment. Per abdomen examination revealed soft, tender without any mass palpable in the right lower abdomen. All basic investigations were normal. Ultrasonographam(USG) revealed 53.6 centimetres sized mesenteric cyst. Contrast enhanced computerised tomography(CECT) abdomen showed ileocaecal mass and mesenteric cyst. But colonoscopy study was normal. Carcinoembryonic antigen(CEA) and Cancer antigen(CA) 125 were within normal limits. so proceeded to laparotomy where a separate cyst of size 87 centimetres arise from retroperitoneal wall and a separate left chocolate ovarian cyst found. Other wise normal large and small bowel. Excision of both cysts done. Histopathological examination revealed simple cyst with mucous lining without any anatomical structure origin . post operative period was uneventful .patient is on regular follow up. This case is being presented for its rarity.