The etiology of BBE, which is not known exactly, may be related with the autoimmune damage after viral infection. The course of the BBE was monophasic and benign. Corticosteroid treatment is effective and the prognosis is favorable.

• 脑干脑炎病因不明,病原学常难以明确,推测是病毒感染后自身免疫损伤所致,呈单相良性病程,激素治疗有效,预后良好。