Accessory cavitated uterine mass: A case report of eight patients.

To investigate the clinical characteristics, key diagnostic features, surgical management strategies, and postoperative outcomes of accessory cavitated uterine mass, with the aim of improving diagnostic accuracy and standardizing clinical management. A retrospective analysis was conducted on eight patients with accessory cavitated uterine mass who underwent surgical treatment at Gansu Provincial Maternity and Child Care Hospital between February 2023 and August 2025. Clinical presentation, imaging findings, surgical procedures, pathological results, and postoperative outcomes were systematically reviewed. The patient ages ranged from 19 to 39 years, and all presented with dysmenorrhea. Severe pain was reported in five patients (62.5%). Preoperative ultrasonography and pelvic magnetic resonance imaging suggested accessory cavitated uterine mass in all cases. Lesions were located on the left side in six patients (75%). The mean lesion diameter was 3.1 ± 0.62 cm. All patients successfully underwent laparoscopic excision without intraoperative or postoperative complications. During follow-up through October 2025, no recurrences were observed. Complete resolution of dysmenorrhea was achieved in seven patients. Accessory cavitated uterine mass primarily affects young women, with progressively worsening dysmenorrhea being the hallmark clinical presentation. Ultrasound combined with magnetic resonance imaging is the key diagnostic method. Laparoscopic excision is an effective, fertility-preserving treatment option with favorable postoperative outcomes.