Successful treatment of severe retroauricular pyoderma gangrenosum with upadacitinib in a patient with Crohn's disease and a history of cerebral venous sinus thrombosis. - Fousekis F; Ronicke M; Sollfrank L; Rech J; Berking C; Neurath MF; Sticherling M; Atreya R (Therapeutic advances in gastroenterology, 2026)