title: Skin ulcers misdiagnosed as pyoderma gangrenosum.
authors.forename: Tjip S
authors.initials: TS
authors.lastname: van der Werf
authors.forename: Ymkje
authors.initials: Y
authors.lastname: Stienstra
authors.forename: Winette T
authors.initials: WT
authors.lastname: van der Graaf
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D009165:Mycobacterium Infections, Nontuberculous / Q000175:diagnosis*; D019911:Mycobacterium ulcerans / Q000302:isolation & purification; D017511:Pyoderma Gangrenosum / Q000175:diagnosis*; D012883:Skin Ulcer / Q000175:diagnosis / Q000382:microbiology*