This video demonstrate Mucocele of Gallbladder with Impacted Stone at the Neck Performed by Mishra's Knot. A gallbladder mucocele is the distention of the gallbladder by an inappropriate accumulation of mucus. Decreased bile flow, decreased gallbladder motility, and altered absorption of water from the gallbladder lumen are predisposing factors to biliary sludge.