A RARE CASE OF CROHN DISEASE COMPLICATED WITH STEROID MONOTHERAPY-RELATED RETROPHARYNGEAL ABSCESS AND INITIALLY MISINTERPRETED PYODERMA GANGRENOSUM DEVELOPMENT. (July 2018) - Doulberis, Michael; Dähn, Jörg; Kountouras, Jannis; Maier, Volker; Helbling, Arthur; Dubach, Patrick