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De Garengeot's hernia: an unusual case on call. De Garengeot's hernia is defined as a femoral hernia that contains the appendix. Owing to the extreme rarity of de Garengeot's hernia, it could represent a diagnostic challenge; however, it should remain in the differential diagnosis, particularly in this patient demographic. A female patient aged 96 years, who presented as an emergency with acute right iliac fossa pain, was found to have de Garengeot's hernia. The diagnosis was made intraoperatively, where she was treated with an appendicectomy and repair of the hernia defect. The incidence of de Garengeot's hernia is 0.5-5% and the incidence of appendicitis within a femoral hernia is extremely rare. Preoperative diagnosis is challenging to the treating surgeon, which requires a high index of suspicion and is usually made intraoperatively. There is no standard treatment; however, simple appendicectomy and hernia repair seems to be an accepted management.