Recent functional imaging and neurophysiologic studies indicate that the occipital cortex may play a role in Braille reading in congenitally and early blind subjects. We report on a woman blind from birth who sustained bilateral occipital damage following an ischemic stroke. Prior to the stroke, the patient was a proficient Braille reader. Following the stroke, she was no longer able to read Br...

A patient with migraine who had a permanent visual field defect was studied by angiography and CT scan. He also had a tomographic study of cerebral blood flow (CBF) and oxygen extraction fraction (EO2) using the non-invasive continuous oxygen-15 (15O) inhalation technique. Angiography was normal. CT scan revealed an area of decreased density with contrast enhancement suggestive of a recent infa...

To the best of our knowledge, persistent visual symptoms, lasting months or years without evidence of infarction, a rare complication of migraine with aura, has been reported in only 20 patients. We report the case of a 43-year-old woman with a 31-year history of migraine with typical visual aura. At presentation, she experienced a visual aura in her right hemifield followed by a pulsating head...

Retro-chiasmal lesions almost always give rise to homonymous field defects with only one exception. The nasal visual field extends to 60% of the horizon, whereas the temporal field extends to a further 30°-40° beyond that; this part of the visual field is represented on the contralateral anterior parieto-occipital sulcus. A lesion in this area will give rise to monocular visual field defect aff...

We examined a patient who had signs of a cerebral hemisphere lesion: right hemiparesis, facial weakness, right hemianopsy, acustico-mnestic dysphasia, "empty speech," acalculia, visuo-spatial agnosia and constructional apraxia, but without changes in consciousness. Taking into account clinical signs, computed tomography and carotid angiography findings, we concluded that our patient had an infa...

It is still an open question if the auditory system, similar to the visual system, processes auditory motion independently from other aspects of spatial hearing, such as static location. Here, we report psychophysical data from a patient (female, 42 and 44 years old at the time of two testing sessions), who suffered a bilateral occipital infarction over 12 years earlier, and who has extensive d...

OBJECTIVE To clarify whether agraphia or alexia occurs in lesions of the left posterior middle temporal gyrus. METHODS We assessed the reading and writing abilities of two patients with this lesion using kanji (Japanese morphograms) and kana (Japanese syllabograms). RESULTS Patient 1 first presented with pure alexia more impaired for kana after an infarction in the left middle and inferior ...

BACKGROUND AND PURPOSE The characteristics of hypoperfusion in the supratentorial region of patients with brain stem infarction are unclear. We investigated the relationships between the presence of hypoperfusion and the location, number, and size of the infarcts with xenon contrast-enhanced CT. METHODS One hundred five patients with brain stem infarction detected by MR imaging underwent xeno...

Anton's syndrome (AS) describes the condition in which patient deny their blindness despite objective evidence of visual loss, and moreover confabulate to support stance. It is a rare extension cortical which, addition injury occipital cortex, other centers are also affected, with patients typically behaving as if they were sighted. This case presents 76-year-old verified result stroke. The per...

Case Description- Three female Pomeranian dogs with mean age about 1-year-old and history of seizure and sudden shock were referred to Small Animal Hospital of University of Tehran. Clinical Finding- Occipital Dysplasia was diagnosed by radiographic findings in rostrodorsal- coudoventral oblique view in all cases. Treatment and Outcome- These dogs recovered by 14 days administration of Glucoc...