Colonic Perforation in Polyarteritis Nodosa With Concurrent Perforated Sigmoid Diverticulitis.

Polyarteritis nodosa (PAN) is a medium-sized vasculitis with neuropathy, cutaneous manifestation, and gastrointestinal tract symptoms. An acute surgical abdomen is a severe but rare development of gastrointestinal involvement of PAN, with large bowel involvement and subsequent perforation being sporadic. Here we present a rare case of PAN who had large bowel involvement with perforation due to newly diagnosed PAN, who also had concurrent and separately perforated sigmoid diverticulitis, confusing the clinical picture. High clinical suspicion and timely management are vital in diagnosing and managing patients with PAN and an acute surgical abdomen.