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Figure 3 (A-D): AAD in two different patients Chiari 1 malformation: Sagittal T1W (A) and CT (B) image showing descent of cerebellar tonsil beyond foramen magnum into the cervical canal. Associated basilar invagination, atlanto-axial dislocation and occipitalisation of atlas is seen Klippel feil syndrme: Coronal (C) Sagittal T2W (D) MRI images in a patient with short neck showing multiple segmentation anomalies with AA dislocation occipitalisation of atlas, and chiari I malformation. Associated syrinx (arrow) is also noted |
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