Cerebellar tonsils projecting significantly below the foramen magnum extending into the upper cervical canal describes __________.

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Cerebellar tonsils projecting significantly below the foramen magnum is a classic MRI finding of Arnold-Chiari malformation, which is a structural defect in the skull that leads to compression of the brainstem, cerebellum, and spinal cord. Melorheostosis is a rare bone disorder that causes abnormal bone growth, Sprengel deformity is a congenital deformity of the shoulder blade, and Menke syndrome is a rare genetic disorder affecting copper metabolism. None of these conditions are associated with cerebellar tonsillar ectopia.

Cerebellar Tonsils Projecting Significantly Below the Foramen Magnum Extending into the Upper