TY - CHAP M1 - Book, Section TI - Pyoderma Gangrenosum A1 - Hardin, J. Matthew A2 - Knoop, Kevin J. A2 - Stack, Lawrence B. A2 - Storrow, Alan B. A2 - Thurman, R. Jason Y1 - 2021 N1 - T2 - The Atlas of Emergency Medicine, 5e AB - Pyoderma gangrenosum (PG) is an inflammatory condition of all ages but is most common among 20- to 50-year-old females. Lesions can be located anywhere (most commonly on the lower extremities) and begin as a papulopustule surrounded by erythema. This pustule erodes and expands to form a necrotic ulcer. Similar satellite pustules and ulcers form around the original lesion and can rapidly coalesce into a larger ulcer. The surrounding border is “rolled,” due to the convex elevation, and has a violaceous hue. The ulcers are exquisitely tender to movement and palpation. On the extremities, the ulcers can involve muscles and tendons. Ostomy sites are a common location and can make management very difficult. SN - PB - McGraw-Hill CY - New York, NY Y2 - 2024/04/18 UR - accessemergencymedicine.mhmedical.com/content.aspx?aid=1181043956 ER -