title: Acute encephalopathy with bilateral striatal necrosis: favourable response to corticosteroid therapy.
abstract: A case of acute encephalopathy with selective bilateral symmetrical striatal lesions is reported. The patient was a previously healthy 4-year-old boy who became obtunded after a febrile illness and fell into a state of delirium with severe pain in the feet. He showed abnormal postures: hyperextension of the neck and upper limbs and extreme flexion of both lower limbs, and abnormal involuntary movements of the limbs: tremor, athetotic movement and right hemiballismus. Analysis of serum antibody titres suggested recent primary infection of herpes simplex type 1 (HSV-1). Cranial T2-weighted magnetic resonance imaging (MRI) demonstrated areas of high-signal intensity involving the whole basal ganglia bilaterally. He showed rapid clinical improvement after the initiation of corticosteroid therapy; complete clinical recovery was noted 3 months after the onset. Serial MRI studies demonstrated a rapid reduction of the lesions, resulting in only slight T2-hyperintense areas in both caudate nuclei. The pathogenesis of the disorder remains unknown, though an autoimmune mechanism has been speculated. The clinical and laboratory findings in this case suggested a possible role of HSV-1 in the pathomechanism of the disorder and a beneficial effect of early corticosteroid therapy.
authors.affiliation: Department of Pediatrics, Sendai City Hospital, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yamamoto
authors.forename: H O
authors.initials: HO
authors.lastname: Chiba
authors.forename: M
authors.initials: M
authors.lastname: Ishitobi
authors.forename: H
authors.initials: H
authors.lastname: Nakagawa
authors.forename: T
authors.initials: T
authors.lastname: Ogawa
authors.forename: K
authors.initials: K
authors.lastname: Ishii
mesh_terms: D000208:Acute Disease; D001480:Basal Ganglia Diseases / Q000175:diagnosis / Q000188:drug therapy*; D002675:Child, Preschool; D003342:Corpus Striatum / Q000187:drug effects* / Q000473:pathology; D004292:Dominance, Cerebral / Q000187:drug effects; D018792:Encephalitis, Viral / Q000175:diagnosis / Q000188:drug therapy*; D005938:Glucocorticoids / Q000008:administration & dosage*; D006561:Herpes Simplex / Q000175:diagnosis / Q000188:drug therapy*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009336:Necrosis; D011239:Prednisolone / Q000008:administration & dosage*
chemical_list: D005938:Glucocorticoids; D011239:Prednisolone