Neuroradiology board review 2 case 18

Neuroradiology board review. This lecture is geared towards the ABR core exam for residents, but it would be useful for review for the ABR certifying exam or certificate of added qualification (CAQ) exam for neuroradiology. This case shows a patient with cerebellar tonsils which extend below the foramen magnum. They have a “peglike“ or triangular configuration, and extend well below the foramen magnum. The differential for this finding includes Chiari malformation, cerebellar tonsillar ectopia, idiopathic