[Pure alexia due to a fusiform gyrus lesion].
We present a patient with pure alexia following a hemorrhagic infarction in the left fusiform gyrus. The symptom began with alexia preferentially disturbed for kana, but during the course of recovery slight agraphia for kanji became pronounced. In the earlier phase, alexia was more severe than agraphia and he could write kanji that he could not read. Furthermore, kinesthetic reading was effective. These findings are consistent with the symptoms of pure alexia, although the fact that a writing disturbance for kanji persisted resembles the profile of alexia with agraphia for kanji due to a posterior inferior temporal lesion. Based on the fact that the posterior inferior temporal lesion showed more severe agraphic symptom and more frequent nonresponse writing errors of kanji, and that our patient's lesion was mainly located in the fusiform gyrus that is medial to the inferior temporal gyrus, we believe that alexia occurred when the inferior temporal gyrus was disconnected from the fusiform gyrus, as a result, visual information could not reach the inferior temporal gyrus in which the visual images of individual kanji are stored.
Takada
T
T
Department of Neurology, Japanese Red Cross Medical Center.
Sakurai
Y
Y
Takeuchil
S
S
Sakuta
M
M
D000368:Aged; D002544:Cerebral Infarction / Q000150:complications*; D004411:Dyslexia, Acquired / Q000209:etiology*; D006801:Humans; D008297:Male; D013702:Temporal Lobe / Q000098:blood supply*