Introduction: Fibromyomas are benign tumours of frequent uterine location, most often found in black women, whose diagnosis of certainty is histological. The extra uterine location is rare and the physio-pathogenesis is poorly understood. This location poses diagnostic problems on imaging. Management is based on tumour resection. Observation: The authors report a clinical case of a 31-year-old woman who was seen for non-febrile hypogastric pain with a large abdominopelvic mass on physical examination. There was no particular history. The biology did not show any abnormality. Ultrasound with Doppler found a mass that was difficult to characterize, and was completed by a CT scan and a pelvic MRI. The management was surgical with an evolution marked by complications. Conclusion: Ectopic leiomyoma is a rare condition. This location poses diagnostic problems on imaging. Management depends on the type of extra uterine presentation of the myoma.