TH7.5 De Garengeot hernia: a combination of niche presentation, diagnostic, and anatomical factors

Abstract

Abstract Background De Garengeot hernias occur in almost 1% of femoral hernias and are diagnosed when the appendix is also present within. They are more commonly observed in post-menopausal women, but their pathogenesis remains controversial. Theories involve abnormalities in bowel rotation during embryological growth, caecum mobility or size, and increased abdominal pressure. Most are diagnosed intra-operatively and are otherwise incidentally discovered on imaging. An advised surgical technique has not been determined due to its rarity; however, most literature suggests laparoscopic hernioplasty and appendicectomy in absence of infection. Case report A 77-year-old female presented with a three-day history of a painless, right groin mass. Blood results were within normal range, and sonography identified a De Garengeot hernia suggesting appendiceal inflammation. She underwent emergency laparoscopic surgery that discovered a strangulated appendiceal tip within an incarcerated femoral hernia, which then unexpectedly divided during manipulation. Additional findings included a broad mesoappendix and lack of appendicitis. The team proceeded with a hernioplasty and appendicectomy, and the patient was discharged two days later without complications. Conclusion This case report highlights a few niche aspects of De Garengeot hernias. Firstly, it is unusual our patient's diagnosis occurred preoperatively via ultrasound; secondly, the ischaemic tip of the appendix unexpectedly self-detached upon mobilisation; and thirdly, the widened mesoappendix likely contributed towards her predisposition to De Garengeot hernias. Overall, our case represents laparoscopic surgery being optimal in treating De Garengeot hernias that are diagnosed preoperatively, and that they should remain a differential diagnosis for non-specific groin lumps, regardless of pain.