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Brain and cervical spine in a patient presenting with cough headache and bilateral upper extremity sensory symptoms (MRI)

(A) Sagittal T1 image showing descent of the cerebellar tonsils into the foramen magnum and associated cervical syrinx. (B) Axial T2 image showing cross-section of the cervical syrinx. (C) Sagittal T1 image showing extent of the cervical syrinx. (Contributed by Dr. Christopher Boes.)