Pelvic endometriosis is a cause of pelvic pain, dysmenorrhea, urinary symptoms and infertility. MRI is considered as the best imaging technique to detect and to predict the extent of the disease. Susceptibility Weighted Imaging is routinely performed to identify haemorrhagic lesions in brain MRI protocols and has proven to be a sensitive technique to detect blood by-products. A pelvic MRI protocol including SWI will be performed in all women addressed for diagnostic assessment or pre-operative work-up of endometriosis.