title: Letter: Perioditic alternating nystagmus.
mesh_terms: D001254:Astrocytoma / Q000150:complications*; D001932:Brain Neoplasms / Q000150:complications*; D002648:Child; D005260:Female; D006801:Humans; D008526:Medulla Oblongata; D009759:Nystagmus, Pathologic / Q000209:etiology*; D010507:Periodicity; D011149:Pons; D014726:Vestibular Nuclei