Table 2.

Differential diagnosis table for de Garengeot Hernia

Differential Diagnosis	CT	Ultrasound
De Garengeot Hernia	Appendix within hernial sac passing posterior and inferior to the inguinal ligament, and medial to the femoral neurovascular bundle. Appendix may or may not be inflamed. Intramural gas suggests ischaemia. Extraluminal gas is diagnostic of perforation.	Hernial positioned medial to the femoral artery and nerve. Hernial sac may or may not be seen to contain viscous, mesentery, fluid or gas.
Amyand Hernia	Appendix within the inguinal canal, passing anterior to the inguinal ligament.	Groin mass with sonographic appearance of an inguinal hernia containing bowel or mesentery.
Littre Hernia	Meckel’s diverticulum within a hernial sac.	Sonographically similar to femoral or inguinal hernia.
Velpeau Hernia	Hernia passing inferior to the inguinal ligament but anterior to the femoral neurovascular bundle.	Sonographically similar to femoral hernia. Hernia passes superficial to the femoral neurovascular bundle.
Cloquet Hernia	Hernia through the pectineus fascia, overlying the pectineus.	Sonographically similar to femoral hernia, medial to the femoral neurovascular bundle.
Laugier Hernia	Hernia through the lacunar ligament, along the inferomedial edge of the inguinal ligament.	Sonographically similar to femoral hernia, usually superior to the femoral neurovascular bundle.
Serafini Hernia	Hernia inferior to the inguinal ligament but posterior to the femoral neurovascular bundle.	Sonographically similar to femoral hernia, deep to the femoral veins and arteries.
Infected/necrotic lymphadenopathy	Enlarged inguinal lymph nodes with a hypodense central core and surrounding fat stranding.	Enlarged, hypervascular, hypoechoic lesion in the groin surrounding by other prominent lymph nodes.