In 2 cases with lipomyelomeningocele, lumbar sacral spine bifida and subcutaneous lipoma of lumbar sacral herniated into subdural, lipoma/placode interface located outside sacral canal.

• 脂肪脊髓脊膜膨出2例，腰骶管后裂开且腰骶皮下脂肪瘤通过裂口疝入硬膜下，横断位见脂肪瘤-基板界面位于骶管外。