患者女 ,6 4岁。因右髋部肿痛年余来院就诊。Ｘ线正位片见右侧坐骨囊状膨胀性骨破坏 ,皮质菲薄 ,骨壳完整。ＣＴ扫描 :右侧坐骨可见一不规则囊状膨胀性骨破坏区 ,累及坐骨上下肢。病灶骨壳大部分完整 ,其外缘可见薄层硬化带。病灶内为软组织密度结构 ,ＣＴ值为 2 6～ 41Ｈａ ; Female patient, 6 4 years old. Due to the swelling and pain of the right hip came to the hospital for more than a year. The anteroposterior saccular swelling of the ischium is seen in the X-ray radiograph. The cortex is thin and the bone and shell are intact. CT scan: The right ischium showed an irregular cystic distended bone destruction area, involving the upper and lower limbs of the ischium. Most of the lesion’s bone shell is complete, and its outer edge can be seen as a thin layer of hardened zone. The lesions had soft tissue density structure, and the CT value was 26 ~ 41Ha.