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Background: Solitary fibrous tumour (SFT) is a rare mesenchymal neoplasm of fibroblastic differentiation, characterised by unpredictable biological behaviour. While SFTs are most commonly present in the fifth and sixth decades of life, they are frequently diagnosed incidentally. Aim: This study aims to report and describe a rare case of a solitary fibrous tumour (SFT) involving the prostate/pelvic region, highlighting its clinical presentation, diagnostic process, surgical management, and patient outcome. Case Presentation: A 57-year-old gentleman presented with lower abdominal pain and difficulty in passing urine for six months, and the examination revealed a suprapubic hard mass, which was bimanually palpable. A guided core biopsy from the prostate revealed a high-grade spindle cell neoplasm. The patient subsequently underwent resection of the pelvic tumour along with prostatectomy and permanent suprapubic cystostomy. Postoperative histology confirmed the preoperative diagnosis, and the patient completed adjuvant radiotherapy. He has been disease-free for the last 30 months. Conclusion: SFTs typically arise from the pleura and are often pedunculated, representing about 30% of cases; other commonly affected areas include the meninges (27%), the abdominal cavity (20%), the trunk (10%), the extremities (8%), and the head and neck (5%). Due to their nonspecific clinical presentation, SFTs can be difficult to diagnose, but they are treatable when detected early. Surgical management of SFTs is similar to that of most soft tissue sarcomas, with a goal of wide resection margins and preservation of any critical surrounding organs. It is highly variable based on the location and involved structures. A multidisciplinary team approach with surgeons experienced in sarcoma surgery is recommended for the treatment and management of these tumours.