Mirror Writing after Thalamic Hemorrhagic Stroke: A Case Report

Mirror-writing is the process of reversing individual letter and composing word sequence in opposite direction. Unintentional mirror writing has been observed in young children learning to write and interpreted as the manifestation of different cognitive impairments. It is very rare that normal right-handed adult shows mirror writing. However, the acquired "mirror writing" may be shown in left hemispheric stroke, neurodegenerative disease, and diffuse cerebral disorders. To explain this event, some assumption have been indicated such as the motor, the visual dominance, the supplementary motor area, the visio-spatial, the visual word-form, the hemispatial factor or directional and the reflected graphemic representation hypotheses. It is reported that the lesions which causes the "Mirror-writing" are the parietal lobe, basal ganglia, thalamus and right supplementary motor area, etc. We reported a case of "mirror-writing" with left thalamic hemorrhagic stroke.

Mirror-writing after Corpus Callosum Lesion Induced by Both Posterior Cerebral Artery Infarction: A case report

"Mirror-writing" is the simultaneous process of reversing individual letters and composing word strings in reverse direction. It is reported that the lesions which cause "mirror-writing" are left parietal lobe, left basal ganglia, right supplementary motor area, left supplementary motor area, left cingulate gyrus, and left angular gyrus. To explain this phenomenon, several theories have been proposed such as the motor, the visual dominance, the supplementary motor area, the visio-spatial, the visual word- form, the hemisaptial factor or directional and the reflected graphemic representation hypotheses. With reviewing some of literatures, we present a case of "mirror- writing" of posterior corpus callosum lesion which is not included in the aforementioned those.

Left Hand Mirror Writing Following a Left Temporo-Parietal Lobe Infarction

Mirror writing is the simultaneous process of reversing individual letters and composing word strings in the reverse direction. This phenomenon appears rarely only after brain damage. We present the case of a 65-year-old, right-handed man with mirror writing following a left temporo-parietal lobe infarction. He preferred to write in the mirror direction with his left hand, but he did not show any visual-spatial disturbance and allochria. We think that damage to the dominant writing program of the brain, releases the normally suppressed contralesional writing program and this uninhibited program induces the mirror writing.

"Mirror-Writing" in the Traumatic Brain-Injured Patient without Specific MRI Findings

Mirror writing is script that runs in the direction opposite to normal, with individual letters also reversed. A Right handed woman suddenly developed mirror-writing. After traumatic brain injury without definitive lesions on MRI, she could not discriminate between right and left by herself. Several theories, including motor, visual dominance, spatial disorientation and supplementary motor hypotheses, have been proposed to explain such. We believe that availability of mirror engrams induce reversal of normal left-to-right writing pattern including mirror-writings.