Percutaneous gallbladder endoscopy is valuable in evaluating patients after nonsurgical treatment of gallbladder stones. It can detect the residual debris that is usually missed by ultrasonography or fluoroscopy, and gives valuable information on the nature and location of such residue to aid in its elimination. Endoscopy also permits direct inspection of the gallbladder mucosa for the detection of neoplasia that may be associated with gallstone disease. In order not to dilate the percutaneous puncture of the dissolution catheter, thereby prolonging patient recovery, a 2.2 mm miniscope has been developed and used for diagnostic cholecystoscopy after automatic contact solvent litholysis.