A primary umbilical endometrioma in a 38-year-old woman: a case report

Primary umbilical endometriosis (UE) is a rare case of migration of endometrial tissue to a distant location. However, there are literature gaps surrounding this area of study and may be easily missed when forming differential diagnoses for umbilical masses. We report a case of primary UE in the setting of abdominal pain and umbilical mass. The patient is a 38-year-old female who was admitted for abdominal pain and an umbilical mass. An umbilical mass without evidence of an umbilical hernia was found on computed tomography of the abdomen and pelvis. The differential diagnosis of umbilical hernia was then introduced. Exploration and surgical excision were utilized. Pathologic frozen sections confirmed endometrioma. Both medical and surgical therapies may be used in treating UE. This case highlights the need for awareness of rare endometriosis manifestations and illustrates the diagnostic challenges when assessing for possible causes of umbilical mass. By adequately evaluating for causes such as UE, we can accurately treat it with medical and surgical therapies.