This slide illustrates the lesions seen in the partial colectomy specimen obtained from a 78-year-old man who has chronic constipation, left lower quadrant pain, and fever. On cross section, this sigmoid colon shows changes most consistent with the diagnosis of

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The cross section through this sigmoid colon shows the outpouchings typical of diverticulosis. Because the diverticula are surrounded by collars of fibrous tissue, it can be assumed that there is pericolonic inflammation, which originates in the diverticula. The disease thus is best classified as diverticulitis.

This Slide Illustrates the Lesions Seen in the Partial Colectomy