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  • Title: [Thalamic dementia due to infarct of the left thalamus and genum of the right internal capsule].
    Author: Porta-Etessam J, Martínez-Salio A, Berbel A, Benito-León J, García-Muñoz A, Kesler P, Mateo S.
    Journal: Rev Neurol; ; 33(11):1043-6. PubMed ID: 11785031.
    Abstract:
    INTRODUCTION AND OBJECTIVES: Thalamic dementia is the clinical consequence of a disorder of both thalami. It is generally secondary to bilateral paramedial thalamic infarcts due to disorders of small blood vessels or cardioembolism. We report a case of dementia of acute onset involving the left thalamus and the genum of the right internal capsule. CLINICAL CASE: A 33 year old man, HIV positive, category B2, admitted to hospital for tuberculous meningitis presented with the acute onset of somnolence, followed by marked bradypsychism, personality changes, marked disorder of executive explicit memory without associated praxic, gnosic or language disorders. Ocular motility remained normal. There was left central facial paralysis with inverse emotive voluntary dissociation. The other cranial nerves were normal. There was left hemiparesia with extensor plantar reflex. No other alterations. Cerebral MR imaging was compatible with paramedial infarcts of the left thalamus and genum of the right internal capsule. CONCLUSIONS: Thalamic dementia generally occurs in bilateral paramedian thalamic disorders. There are cases of disorders of executive memory secondary to infarcts of the genum of the internal capsule due to interruption of the thalamotemporal pathways and a contralateral paramedial thalamic lesion.
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