“…Despite these advantages, significant side effects have occurred. These side effects have included transient hallucinations (Eldevik, Nakken, et al, 1978;Grainger, Kendall, et al, 1976;Sortland, Lundervold, et al, 1977), hyperacusis (Grainger, Kendall, et al, 1976), seizures (Sortland, Lundervold, et al, 1977;Lundervold and Sortland, 1977;Nickel and Salem, 1977), significant electroencephalographic (EEG) abnormalities (Sortland, Lundervold, et al, 1977;Lundervold and Sortland, 1977;Skalpe, Tabergsen, et al, 1973;Kaada, 1977;Skalpe, 1975Skalpe, , 1977, areflexia (Buruma and Hekster, 1977), cerebrospinal fluid ( C S F ) pleocytosis (Grainger, Kendall, et al, 1976;Skalpe, 1977), nausea, vomiting (Eldevik, Nakken, et al, 1978;Grainger, Kendall, et al, 1976;Nickel and Salem, 1977), and confusion (Eldevik, Nakken, et al, 1978;Sortland, Lundervold, et al, 1977;Koerner, 1979). We report a patient in whom a prolonged confusional state, dysphasie speech, includ-ing echolalia and perseveration, and striking asterixis followed metrizamide myelography.…”