GAMUT H-132
EXTRAPERITONEAL GAS
(See also H-139)

COMMON
1. Abscess G
2. Iatrogenic (eg, postoperative; rectal biopsy; enema; needle aspiration; gas insufflation)
3. [Interposition of colon (Chilaiditi S.)]
4. Perforation of gastrointestinal tract (eg, peptic ulcer; diverticulum; carcinoma; Crohn's disease)
5. Trauma (eg, gunshot wound; duodenal or colonic rupture)


UNCOMMON
1. Emphysematous cholecystitis (perforated)
2. Pneumatosis intestinalis with leakage
3. Pneumomediastinum with caudal tracking (eg, spontaneous; traumatic; tracheotomy)
4. [Portal vein gas]


[    ] This condition does not actually cause the gamuted imaging finding, but can produce imaging changes that simulate it.




References