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Table 2 Parastomal hernia CT classification

From: Imaging the postoperative patient: long-term complications of gastrointestinal surgery

Type 0 Peritoneum follows the wall of the bowel, with no sac formation
Type Ia Only bowel forming the colostomy, with a sac <5 cm
Type Ib Hernial sac containing only bowel forming the colostomy, with a sac >5 cm
Type II Hernial sac containing omentum
Type III Hernial sac containing intestinal loop other than the bowel forming the stoma