[Extrapelvic endometriosis is a difficult diagnosis]

Extrapelvic endometriosis is a rare type of endometriosis. The diagnosis can be challenging, especially if the patient lacks characteristic endometriosis symptoms. This case report presents a 27-year-old woman diagnosed with both primary umbilical endometriosis and infiltrating endometriosis of the diaphragm. The woman presented with a painful bluish tumour in the umbilicus and cyclic pain in her upper right abdomen, but no lower abdominal pain. Endometriosis should be one of the differential diagnoses when symptoms like pain and/or swelling is cyclic and menstrual-related.