Spiral galaxies, such as the Milky Way, consist of a flat disk with a bulging center and surrounding spiral arms.
象银河系一样，螺旋星系由一个中间鼓起的扁圆盘和环绕在周围的螺旋形手臂组成。
CT and MRI of 28 cases with protrusion of lumbar disk in surgical. Findings of bulging and herniation by CT and MRI as well pressed, shift, deformed, calcification, vacuum of dural sac and nerve root.
报道经手术证实的28例腰椎间盘突出患者的CT和MRI所见，观察到腰椎间盘膨隆和间盘疝的CT和MRI表现及其所引起的硬膜囊和神经根受压，移位，变形，钙化，真空征等伴随异常。
CT and MRI of 28 cases with protrusion of lumbar disk in surgical. Findings of bulging and herniation by CT and MRI as well pressed, shift, deformed, calcification, vacuum of dural sac and nerve root.
报道经手术证实的28例腰椎间盘突出患者的CT和MRI所见，观察到腰椎间盘膨隆和间盘疝的CT和MRI表现及其所引起的硬膜囊和神经根受压，移位，变形，钙化，真空征等伴随异常。
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