Before the advent of cholecystography, clinical recognition of anomalies of the gallbladder was rarely recorded. Boyden1 reviewed the subject of accessory gallbladder in 1926. His figures are based on the study of 10,000 domestic animals and 19,000 human beings. He found that this anomaly occurred once in every 8 cats, 28 calves, 85 sheep and 198 pigs and only once in from 3,000 to 4,000 human beings. Only 20 cases in human beings were recorded from 1674 to 1926. Boyden classified these into (1) vesica divisa, or bilateral gallbladder, and (2) vesica duplex, which was subdivided into: (a) Y-shaped, with two cystic ducts merging into one, and (b) ductular, with two complete cystic ducts opening separately into the common duct.
There were only 4 examples of the ductular variety in his series of 20 cases. Since the time of Boyden's publication, several more cases of this anomaly have been
HERRMANN SF, HICKS GS, MARTIN DL. DOUBLE GALLBLADDER: REPORT OF A CASE. Arch Surg. 1933;27(5):905–909. doi:10.1001/archsurg.1933.01170110090007
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