Abstract
The biiobed gallbladder is particularly rare among the malformations of the cholecyst and only 11 cases having this abnormality are reported, so far. Regarding to these reported cases, 2 cases were diagnosed by means of oral cholecystography, while all of the others were accidentaly found through the operation or autopsy. Recently, we experienced a case of possible biiobed gallbladder diagnosed by ERCP examination. From the analysis of these reported cases including ours, we brought forward a new classification of its deformity from a correlation between the deformity and axis of the gallbladder.