Dystextia and dystypia due to phonological errors after ischemic stroke: a case report in a Japanese patient.

A 69-year-old Japanese male presented with acute dystextia and dystypia, defined as texting and typing impairments, respectively. His text input speed decreased due to a phonologically incorrect kana flick input on his smartphone. Additionally, dystypia occurred due to phonemic paragraphia of Romaji. Brain MRI revealed a new left lenticulostriate infarction sparing the cerebral cortex. SPECT showed reduced cerebral blood flow in the left inferior precentral frontal gyrus as well as in the infarction area. It was concluded that his abnormal phonological processes resulted from hypoperfusion in the left inferior precentral gyrus that is assumed to be an endpoint of the arcuate fasciculus.