Objective: Abdominal desmoid tumours are rare benign neoplasms. They are commonly found in the mesentery, while they are rarely found in the intestinal wall. Most cases are sporadic, although there is a link with colonic polyposis, trauma, and oestrogen. They predominate in 25-35 year-old women. This present case is notable due to its location in the jejunal wall, possible relation with previous surgery, and the age and sex of the patient. Method: We present a 51-year-old male patient previously operated for umbilical hernia years before. He came to the consultation on noticing an abdominal mass. Since the initial suspicion was of jejunal wall GIST tumour, surgery was performed. Results: The histopathological and immunohistochemical findings, support the diagnosis of desmoid tumour. Conclusion: Desmoid tumours consist of fibroblastic monoclonal proliferation developed from aponeurotic muscle structures. Some authors consider them non-neoplastic processes given their limited aggressiveness while others classify them within distinct low-grade sarcomas. Their origin is not well established, although there are known factors involved such as mutations in the APC gene or beta-catenin and trisomy 20 and 8. The originating cell, the myofibroblast, is involved in post-traumatic cellular regeneration. This explains why we find these tumours associated with previous surgery.