A patient with glioblastoma of the rostral brainstem and hypothalamus exhibited bilateral internuclear ophthalmoplegia and vertical nystagmus; he suffered episodes of cataplexy, narcolepsy, and sleep paralysis. A peculiar fluctuation of posture and tone ("limp man syndrome") proved to be a manifestation of continuous cataplexy, as documented by H-reflex recordings. This is the first report of a remarkable movement disorder caused by continuous, fluctuating, partial cataplexy, and is the second report of an association between cataplexy and a tumor of the rostral brainstem.
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Stahl et al. (1980) studied this question.