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Fig. 4. —89-year-old man admitted for first episode of acute diverticulitis. Transverse pelvic CT scan shows thickened wall of distal sigmoid colon with narrowed lumen, filled by thin strip of intraintestinal contrast media (arrowhead). Cavity containing air–fluid level corresponding to abscess (arrow) is located adjacent to thickened sigmoid segment. Patient underwent IV antibiotic treatment, and abscess was drained under CT guidance. General condition improved, and patient was discharged home 2 weeks later with normal clinical examination and normal WBC. Three months later, he was readmitted to hospital with perforation of sigmoid colon and massive pneumoperitoneum seen on CT examination (not shown). He underwent emergent sigmoidectomy with colostomy (Hartmann procedure) and died soon after surgery.