▁the ▁st om ach ▁wall . ▁This ▁will ▁result ▁in ▁the ▁band ▁moving ▁from ▁the ▁outside ▁of ▁the ▁st om ach ▁to ▁the ▁inside . ▁This ▁may ▁occur ▁sil ently ▁but ▁can ▁cause ▁severe ▁problems . ▁Ur gent ▁treatment ▁may ▁be ▁required ▁if ▁there ▁is ▁any ▁internal ▁leak ▁of ▁g astr ic ▁contents ▁or ▁ble eding . ▁S li pp age ▁– ▁An ▁unusual ▁occurrence ▁in ▁which ▁the ▁lower ▁part ▁of ▁the ▁st om ach ▁may ▁pro lapse ▁through ▁the ▁band ▁causing ▁an ▁en larg ed ▁upper ▁p ouch . ▁In ▁severe ▁instances ▁this ▁can ▁cause ▁an ▁obst ruction ▁and ▁require ▁an ▁ur gent ▁operation ▁to ▁fix . ▁Mal position ▁of ▁the ▁band ▁( rare ▁with ▁experienced ▁pract ition ers ): ▁If ▁the ▁band ▁does ▁not ▁surr ound ▁the ▁vertical ▁( es oph ag us - to - du oden um ) ▁axis ▁of ▁the ▁st om ach ▁but ▁instead ▁surr ounds ▁only ▁a ▁non - vertical ▁( horizontal ▁or ▁diagonal ) ▁axis ▁of ▁the ▁st om ach , ▁as ▁by ▁enc ir cling ▁only ▁a ▁side ▁or ▁portion ▁of ▁a ▁side ▁of ▁the ▁st om ach , ▁then ▁the ▁restriction ▁on ▁food ▁passage ▁will ▁be ▁less , ▁weight ▁loss ▁will ▁be ▁reduced , ▁and ▁a ▁pain ful ▁k ink ▁in ▁the ▁st om ach ▁may ▁result . ▁In ▁two ▁reported ▁cases , ▁prompt ed ▁by ▁patients ' ▁reporting ▁an ▁absence ▁of ▁app et ite ▁supp ression ▁and ▁of ▁weight ▁loss , ▁investigation ▁revealed ▁that ▁the ▁band ▁had ▁not ▁en closed ▁the ▁st