摘要
目的探讨Arnold-Chiari畸形(ACM)MRI表现。方法25例ACM均经MRI诊断,并经手术及临床证实。结果小脑扁桃体疝至枕大孔平面下5～20mm21例,3～4mm4例,23例扁桃体下极变尖与扁桃体前池变形,其中扁桃体前池消失和或颈髓扭曲成角10例,伴脊髓空洞21例,脑积水5例。结论小脑扁桃体位于枕大孔下>5mm即可诊断ACM,对<5mm者,在诊断ACM前需注意正常扁桃体暂时低位,并需结合临床症状体征。
Objective To investigate the findings of Arnold-chiari malformation(ACM)on MR images.Methods Twenty-five patients with surgically and clinically proved ACM underwent MR imaging.MRI findings in all patients were retrospectively analyzed.Results The cerebellar tonsillar herniations of 3 to 4 mm and 5 to 20 mm belew the foramen magnum were found in 4 cases and 21 cases,respectively.The sharpening of tonsillar inferior poles and the vanishing of tonsillar anterior cisterna were found in 23 cases,of them,10 cases had the torsion of cervical spinal tract,21 cases complicated with spinal cavitation and 5 cases complicatecl with hydrocephalus.Conclusion Arnold Chiari malformation is characterized by herniation of the cerebellar tonsils into the upper cervical spinal tract.If only tonsillar herniation of at least 3 to 5 mm below the foramen magnum,ACM can be accurately diagnosed by MRI.When normal tonsils are temporary low-order position,the diagnosis of ACM needs the combination with clinical signs and symptoms.
出处
《实用医学影像杂志》
2002年第3期188-189,共2页
Journal of Practical Medical Imaging
