[名词解释] 原发性骨质疏松症

食管贲门失弛缓症的典型X线表现是() ["A．食管蠕动减弱","B．食管下端不规则狭窄","C．食管下端鸟嘴样或漏斗状狭窄","D．钡剂通过缓慢","E．食管极度扩张"] 肱骨外上髁炎 继发性骨质疏松症 胃肠道造影检查图像中的“四相”，不包括下列哪项() ["A．粘膜相","B．加压相","C．充气相","D．双重对比相","E．充盈相"] 腰椎管狭窄症 原发性骨质疏松症