title: Novel representation of astasia associated with posterior cingulate infarction.
abstract: OBJECTIVE
  The representation elicited in the cingulate motor area has been demonstrated in animals, but remains unclear in humans. In particular, the representation and pathogenic mechanisms of the posterior cingulate cortex are poorly understood, especially in humans. We describe a case of posterior cingulate infarction associated with contralateral astasia.
  
  
  METHODS
  A 67-year-old right-handed man with a 10-year history of hypertension suddenly presented with right-sided pulsion on attempting to stand or sit. On the following day, he could not maintain a sitting position. The patient immediately fell to the floor because of instability, characterized by marked right-sided pulsion despite no muscle weakness, sensorial deficits, or cerebellar ataxia. Magnetic resolution imaging of the brain showed abnormal intensity in the posterior parts of the cingulate, with no other clinically significant lesions.
  
  
  CONCLUSIONS
  Because the cingulate motor area is connected to the vestibulocerebellar system through the thalamic nuclei, disruption of this connection by posterior cingulate infarction may result in astasia.
authors.affiliation: Department of Neurology, Nara Medical University, Kashihara, Nara 634-8522, Japan. hk55@naramed-u.ac.jp
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kataoka
authors.forename: Kazuma
authors.initials: K
authors.lastname: Sugie
authors.forename: Nobuo
authors.initials: N
authors.lastname: Kohara
authors.forename: Satoshi
authors.initials: S
authors.lastname: Ueno
mesh_terms: D000368:Aged; D001921:Brain / Q000473:pathology; D020520:Brain Infarction / Q000175:diagnosis* / Q000473:pathology; D002524:Cerebellar Ataxia / Q000473:pathology; D006179:Gyrus Cinguli / Q000473:pathology; D006801:Humans; D006973:Hypertension / Q000473:pathology; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D020521:Stroke / Q000473:pathology; D013786:Thalamic Diseases / Q000175:diagnosis* / Q000473:pathology; D013788:Thalamus / Q000473:pathology; D013997:Time Factors