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June 26, 1967

Calot's Triangle

JAMA. 1967;200(13):1186. doi:10.1001/jama.1967.03120260082023

To the Editor:—  Recently I came across the following definition of the triangle of Calot1:The cystic duct, which is often tortuous and has a beaded appearance, passes downward and to the left to join the common duct; and the cysticartery arises from the hepatic artery and passes under the common hepatic duct to the gallbladder. These three structures—common duct, cystic duct and cystic artery—form an anatomic triangle (Calot), the base of which is the cystic artery.I recalled that this definition disagreed with what I had learned in freshman anatomy.2Dorland's Illustrated Medical Dictionary (24th edition) agreed with my previously learned definition of Calot's triangle:A triangle bounded by the liver, the cystic duct, and the hepatic duct; it is of particular importance surgically because it contains usually the cystic artery, which most commonly arises in the triangle, the right hepatic artery, and possibly accessory hepatic ducts. Called