- For prospective candidates, an initial attempt to pass a balloon tipped foley catheter through the external cutaneous tract into the stomach will be performed. It will then be followed by radiographic contrast study to evaluate for extravasation of contrast into the peritoneal cavity. If contrast is extravasated, this will be potential candidate for inclusion. If the foley catheter is unable to be passed through the cutaneous tract, that will also be considered someone for inclusion as this patient will still require an operative confirmation of the patency of the gastrotomy.