[Third-degree vertical downward nystagmus due to basilar impression].
D006801:Humans; D009759:Nystagmus, Pathologic / Q000209:etiology*; D009777:Occipital Bone / Q000002:abnormalities*; D010985:Platybasia
NYSTAGMUS/etiology and pathogenesis; OCCIPITAL BONE/abnormalities
III.  Stupen vertikálního nystagmu dolů, podmínený basilární impresí.