[Rare inflammatory diseases of the esophagus].

Because of its high incidence gastroesophageal reflux disease (GERD) is at the forefront of medical attention. On the other hand, vigilance for rare inflammatory diseases of the esophagus, such as herpes esophagitis, radiation-induced esophagitis, eosinophilic esophagitis, pseudodiverticulosis and Crohn's disease is low. Moreover, these entities are rarely distinguishable from GERD by clinical features alone. For all atypical and treatment refractory supposedly reflux diseases, the diagnosis should therefore be questioned and re-evaluated by endoscopy. When the macroscopic findings of esophagoscopy are ambiguous biopsies can be performed and histological examination then often leads to a definitive diagnosis. This is particularly important because the required treatment of rare forms of esophagitis often significantly differs from that of GERD.