The two common types of ventral hernia in the adult are the umbilical and the incisional. The umbilical hernia as an acquired lesion is a defect in the linea alba at the level of the umbilicus, starting at the weakest point of the umbilicus—the superior portion of the original ring. It is associated with obesity and conditions that cause increased intra-abdominal pressure. The fascial defect varies in size but is usually disproportionately small as compared with the size of the sac. Even when the sac is small, as a rule, the defect is smaller. The sac may be so huge as to accommodate a large amount of intra-abdominal contents which manage to enter through a relatively narrow defect.
Incisional hernia is the consequence of a surgical procedure. The anatomic defect varies with the location. The relation between the size of the defect and the size of the sac in incisional
GECHT A. Gigantic Ventral HerniasA Report of Three Cases. AMA Arch Surg. 1957;75(2):197-201. doi:10.1001/archsurg.1957.01280140035007