femoral hernia (EFO_1001791, an Experimental Factor Ontology id) is a groin hernia occurring inferior to the inguinal ligament and medial to the FEMORAL VEIN and FEMORAL ARTERY. The femoral hernia sac has a small neck but may enlarge considerably when it enters the subcutaneous tissue of the thigh. It is caused by defects in the ABDOMINAL WALL. Also known as: Hernia, Femoral.