Another example of a large caterpillar hump shows two separate cystic arteries (one clipped, the other clipped and divided). If a vessel is larger than 3mm, it may be a major hepatic branch and not the cystic artery. Division of such a vessel may cause hepatic necrosis if it is the dominant supply to a liver segment.
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Bergman RA, Thompson SA, Afifi AK, Compendium of Human Anatomic Variation, Baltimore, Urban & Schwarzenberg, 1988, pp 77, 78, 167.
Hartfield PM, Wise RE: Anatomic variations in the gallbladder and bile ducts, in Felson B (Ed): Roentgenology of the Gallbladder and Biliary Tract. New York, Grune & Stratton, 1976, pp 15-22.
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