enclosed tissue can be pulled out completely through the casing however if the tissue enclosed in the bag has a larger diameter than the inside diameter of the casing the tissue is cut up in the bag since the interior space of the bag is externally accessible through its end opening and through the casing the uptake volume of the bag holding the tissue is located within the abdomen and is fully enclosed so that there is no danger that tissue fragments malignant cells cyst content or similar material can get into the free abdominal cavity when cutting up the tissue the intra abdominal cutting up of the tissue in the bag can occur from the outside using suitable instruments such as microforceps micropunches microshears or hollow cylinder punches which are inserted from the open end of the bag and through the casing cylinder punches can preferably have a continuous diameter adjustment and thus they can be readily adapted to the situation and to the different diameters of the casing for better removal of the tissue the interior wall of the threaded casing can be shaped or coated so that tissue can slide in only one direction if the tissue is a cyst then it can be punctured externally through eh open end of the bag and suctioned out when.