(六)特殊类型的消化性溃疡 peptic ulcer of special type 1.球后溃疡 postbulbar ulcer 2.幽门管溃疡 pyloric channel ulcer 3穿透性溃疡 penetrating ulcer 4.老年人消化性溃疡(六) 特殊类型的消化性溃疡 peptic ulcer of special type 1. 球后溃疡 postbulbar ulcer 2. 幽门管溃疡 pyloric channel ulcer 3.穿透性溃疡 penetrating ulcer 4. 老年人消化性溃疡