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anal canal anatomy war anatomy surgical applied anatomy anal canal surgical anatomy anal canal preoperative care preoperative routine investigations preoperative managment 2018 preoperative treatments case presentation retroperitoneum injury shrapnel penetrated abdominal injury.gunshot injury injury missed injury abdominal injury anal fissure history case primary survey trauma taiz penetrating thoracic injuries tube thoracostomy thoracotomy besieged taiz city bilal mansoor chest tube treatment options al thawra hospital