Background: Endometriosis is dened as a chronic, oestrogen- dependent, benign inammatory disease characterized by growth of endometrial glands and/ or stroma outside the uterine cavity. 25% of women affected with endometriosis are asymptomatic, other may present with symptoms like chronic pelvic or abdominal pain and/ or infertility. Common sites or ectopic locations include primarily the pelvic peritoneum, ovaries and rectovaginal septum. We are presenting a case of 30-year-old Indian women with com Case: plains of pain in abdomen and a palpable mass in the anterior abdominal wall in right iliac fossa. Computed Tomography (CT) abdomen and pelvis (Plain and contrast) showed large well dened abnormal soft tissue density mass lesion with inhomogeneous enhancement on contrast – Favouring: ? Infective ? Neoplastic etiology. Result: Excision was done and tissue was sent for histopathology. Histopathological diagnosis was made as Endometriosis. Keeping this case Conclusion: in mind, for patients with subcutaneous mass in anterior abdominal wall and complains of abdominal pain, endometriosis should always be kept as a differential diagnosis. Histopathology stands as a gold standard for the diagnosis as CT (Plain and contrast) is insufcient in the denitive diagnosis of such lesions.