Rai, BRChaudhary, DThapa, PJoshi, MRDongol, UMSSingh, DRSharma, SK2025-07-182025-07-182005https://hdl.handle.net/20.500.14572/371Schwannoma is rare in pelvis. Ancient schwannoma is rarer histological subtype of schwannoma. We report a very rare case of pelvic schwannoma presenting with right sciatica and right iliac fossa pain. Clinical and imaging findings were suggestive of Peritoneal Hydatid cyst. The tumour was resected completely with marked clinical improvement. Histopathological examination showed Ancient cystic schwannoma. Key words: Benign pelvic Schwannoma, Benign retroperitoneal tumour, Giant ancient Schwannoma, Presacral Cystic Schwannomaen-USArticle