NA;Tumors and vascular malformations in the posterior parts of the dominant hemisphere are frequently associated with preoperative alexias, and surgical maneuvers in these areas may cause the appearance of this neurobehavioral deficit as an operative complication. Lesions of the dominant lpar;leftrpar; angular gyrus are associated with the syndromes of alexiawithagraphia. Alexiawithoutagraphia results from lesions of the pathways which conduct visual information from the calcarine areas to the left angular gyrus lpar;splenium of the corpus callosum, left lingual and fusiform gyri, left transverse and vertical occipital fasciculirpar;. A brief bedside examination lpar;outlined in the textrpar; provides useful prehyphen;and postoperative localizing information. Fresh cadaver studies of the brainin situhave shown that the approximate center of the left angular gyrus area is found by first locating a point 9 cm forward along the midline from the inion and then moving 4frac14; cm laterally. These measurements define a point which is a few centimeters medial and posterior to the center of the parietal eminence.
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