Moynihan’s or Caterpillar Hump

Moynihan’s or caterpillar hump of the right hepatic artery is an anomaly of the right hepatic artery, where it is tortuous and comes quite close to the gall bladder or cystic duct. The cystic artery is quite short and difficult to dissect and prone to injury. In such cases, the Right Hepatic Artery can be mistakenly identified as the cystic artery and is prone to be ligated or injured during cholecystectomy. We show images here of the clipped caterpillar hump after complete dissection of the Calot's triangle and after dividing the cystic duct.

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