Introduction: Fibrothecal group tumours are part of the gonadal stromal and sex cord tumours (GSST) and represent 1-4.7% of all organic ovarian tumours and are usually benign. We felt it important to report a case in order to share our experience in the management of fibrothecal tumours of the ovary. Observation: This was a 51-year-old postmenopausal patient who was referred to the hospital for abdominal pain in the context of an abdominal mass. A clinical examination and abdominal ultrasound concluded that the left ovarian tumour was benign. A left annecxectomy was performed and the histological examination concluded that the tumour was benign. No tumour marker was measured and no CT scan was performed. The postoperative course was simple and the patient was followed for 3 months.