Wegener's granulomatosis presenting as pyoderma gangrenosum.
D000293:Adolescent; D014890:Granulomatosis with Polyangiitis / Q000150:complications / Q000175:diagnosis*; D006801:Humans; D008297:Male; D011711:Pyoderma / Q000209:etiology*; D012883:Skin Ulcer / Q000209:etiology*