A 75 year old man presents with mild cramping pain in the left lower abdomen for 1 day. During the same time, he twice passed stools well mixed with fresh blood.
His surgical history is significant for removal of a single adenomatous polyp during a screening colonoscopy 2 years ago. In addition, he was diagnosed with hypertension 5 years ago, and stage III chronic kidney disease 3 years ago, for which he is being followed up regularly.
His smoking history amounts to 7.5 pack years. He only drinks socially and denies recreational drug abuse. A complete blood count reveals a leukocyte count of 12,000/mm3.