[Differential diagnosis of ulcerative mucous membrane diseases of the mouth cavity and pharynx].

Nonmalignant ulcerous diseases of the mouth often require repeated histological and clinical observations for several weeks to establish a diagnosis. One patient with Wegener's disease, one with a necrotizing sialometaplasia, and a case of Sutton-type aphthosis outline these difficulties. In all three cases, only a synopsis of histology, laboratory findings, and clinical appearance led to the respective diagnosis.