Peg-like tonsil (cerebellum)

Peg-like tonsils refer to the CT or MR appearances of pointed cerebellar tonsils on sagittal scans. The may help distinguish low-lying tonsils from cerebellar tonsillar ectopia due to a Chiari I malformation.

The terminology of caudally displaced tonsils is discussed in the article on cerebellar tonsillar ectopia.