A Case of Palisaded Neutrophilic and Granulomatous Dermatitis Associated with an Initial Presentation in Ankylosing Spondylitis.

Palisaded neutrophilic and granulomatous dermatitis (PNGD) is an inflammatory dermatosis associated with systemic immune-mediated diseases such as rheumatoid arthritis, systemic sclerosis, lupus erythematosus, and ulcerative colitis. Histologically, serial development of leukocytoclastic vasculitis is shown from an early stage, which can progress to palisading granuloma in the fully developed stage and to fibrosis in the final stage. A 32-year-old man presented with ankylosing spondylitis showing multiple erythematous papules on his fingers, elbows, knees, and left auricle.