Sigmoid colon perforation in the patient with granulomatosis with polyangiitis.

Background: Granulomatosis with polyangiitis (GPA) induces respiratory tract and kidney granulomatous inflammation due to small-vessel vasculitis. However, gastrointestinal involvement, and especially colon perforation, is rare.

Case Presentation: A 40-year-old man diagnosed with GPA was admitted to our hospital for GPA management.