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  • Title: [A case of diagnostic dyspraxia without ideomotor apraxia by callosal lesion].
    Author: Tei H, Soma Y, Uchiyama S, Maruyama S.
    Journal: Rinsho Shinkeigaku; 1993 May; 33(5):556-8. PubMed ID: 8365065.
    Abstract:
    A case of diagnostic dyspraxia was reported. A 57-year-old right handed male had been suffering from the lack of cooperation between his right and left hands for six months. Except for decreased deep tendon reflexes in all extremities, there were no abnormal findings on neurological examination. On neuropsychological examination, he was attentive, well orientated and his spontaneous speech, comprehension, naming, repetition and reading were intact. There was peculiar dissociative behavior between his right and left hands. For instance, he put a cigarette or coin in the pocket with his right hand then his left hand took out and replaced them, and he buttoned his shirts with his right hand but then unbuttoned with his left hand. These left hand oppositional behavior to his right hand were triggered by voluntary activities of his right hand. Left unilateral agraphia was also revealed but ideomotor apraxia, compulsive manipulation of tools and grasp reflex were not demonstrated. T1-weighted MRI demonstrated irregular low signal intensity areas extending from the genu to the body of the corpus callosum. No definite lesion was detected in the medial aspect of the frontal lobe. Only small numbers of diagnostic dyspraxia have been reported and such cases without ideomotor apraxia or medial frontal lesion are even rare. MRI is very useful for detecting the lesion of the corpus callosum.
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