Because it is rare, umbilical endometriosis is sometimes mistaken for a hernia, a cyst, or a granuloma. A proper diagnosis usually requires a physical exam, imaging like ultrasound or MRI, and sometimes a biopsy. Surgical Intervention
: Occurs without any previous abdominal or pelvic surgery. Its exact cause is unknown, but theories include cells traveling through the lymphatic system or embryonic remnants from birth. navel endometriosis