Lassoing of the small bowel mesentery and abdominal pain caused by band tubing after "band on bypass".

Weight regain after laparoscopic gastric bypass can be difficult to manage. A common finding is an enlarged gastrojejunal complex (dilated gastric pouch and/or jejunum, dilated gastrojejunal anastomosis). Revision of the gastrojejunal complex can be accomplished by surgical resection, endoscopic plication techniques, or more recently, placement of an adjustable band around the dilated gastric pouch ("band on bypass," BoB). We present an unusual complication of the BoB procedure, in which the band tubing looped around the small bowel causing severe abdominal pain.