Question: Question linked to image nº1 An 80-year-old woman is brought to the emergency department for acute abdominal pain that is accompanied by hypotension, tachycardia and fever of 38ºC. Between its antecedents it emphasizes a resection of left colon by carcinoma seven days before. After the initial resuscitation, a simple chest radiograph (shown) is performed, which is diagnostic of: 
 Options:  <1> Pneumoperitoneum <2> Intestinal obstruction. <3> Strangled crural hernia. <4> Left pneumothorax <5> Mesenteric ischemia.
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