Abstract:

A case of retroperitoneal solitary fibrous tumor (SFT) in our hospital was reported. The first treatment, 10-year follow-up and diagnosis and treatment after recurrence were summarized. In 2015, the first surgery was performed to completely remove the tumor located in the left anterior sacrum of retroperitoneum under laparoscopy. Pathology showed SFT with the rich focal cells. There were no symptoms after the first surgery, and the patient was not followed up regularly. Recurrence was first detected in 2022: physical examination and a series of imaging examinations revealed pelvic pararectal nodules, which gradually increased in the number and volume. In 2023, the reexamination revealed that nodules continued to increase. In November 2024, the operation of laparoscopic left deep retroperitoneal tumor resection plus tumor resection near internal iliac artery plus pelvic adhesiolysis was performed. Pathology showed SFT, and the increased cell density and slightly increased mitotic figures (<4 per 10 high-power fields). After six months of the second surgery, the patient did not undergo reexamination due to the continuous urinary retention rehabilitation therapy. Retroperitoneal SFT is very rare, which is belonged to low-grade malignant tumor. SET has recurrence risk, suggesting the necessity of lifelong follow-up. The tumor of this patient is located in the deep part of retroperitoneal pelvic floor, adjacent to pelvic floor nerves and blood vessels. Multi-disciplinary team (MDT) should be recommended for the preoperative diagnosis and treatment. Intraoperative multidisciplinary surgery can significantly improve the safety and success rate of surgery.

Key words: Solitary fibrous tumors, Multi-disciplinary team, Recurrence, Diagnosis, Therapy