Had a mri of the braincan you tell me what it mean by the cerebellar tonsils are seen to extend 2mm caudal to the foramen magnum, compatible with mild ?

Location, location!: Cerebellar tonsils (not to be confused with lingual tonsils in the throat) are at the lower end of the cerebellum and are close to the rim of the opening at the base of skull (foramen magnum = big hole). If the f.M. Isn't big enough & tonsils protrude thru it, not enough space for brainstem may be present, causing compressive symptoms. Also CSF (spinal fluid) may not drain properly-->headaches etc.