A longitudinal cystic duplication of the gall bladder.
D000368:Aged; D003549:Cystic Duct / Q000002:abnormalities* / Q000033:anatomy & histology; D004847:Epithelial Cells; D005704:Gallbladder / Q000002:abnormalities* / Q000033:anatomy & histology; D006801:Humans; D008297:Male