Hernia

Protrusion through an aperture within the abdominal cavity, rather than through its external wall.

A lateral anterior-wall hernia, including the defect through the semilunar region lateral to the rectus sheath.

Displacement of a hernia and its sac while a constriction remains, so apparent disappearance of the external swelling need not mean safe reduction.

A hernia trapping only part of the bowel wall; severe vascular compromise may occur without complete obstruction of the lumen.