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[A Case of Endometrioid Adenocarcinoma in the Sac of a Femoral Hernia].

A 74-year-old woman presented to our institution with right inguinal swelling. The swelling had appeared 1 year previously and exhibited a tendency to increase in size. Physical examination revealed a thumb tip-sized swelling in the right inguinal region. Computed tomography revealed a right femoral hernia and fluid accumulation, resulting in the diagnosis of a right femoral hernia. Using the anterior approach, we completely removed the cystic nodule and repaired the femoral hernia. The hernia sac contained elastic nodules, and pathological examination led to the diagnosis of endometrioid adenocarcinoma. Although postoperative positron emission tomography-computed tomography and magnetic resonance imaging revealed no tumor residue, systemic chemotherapy was selected after consultation with the obstetrics and gynecology department. In summary, we herein report a case of an endometrioid adenocarcinoma that occurred in the sac of a femoral hernia.