Johansson T, Fahlgren H
Neurology. 1979 Mar;29(3):390-3. doi: 10.1212/wnl.29.3.390.
Four cases of alexia without agraphia were studied by 99m-technetium pertechnetate brain scan. Two types of increased uptake were seen. One was of the triangular type near the midline in the posterior view, said to characterize an infarction in the distribution area of the posterior cerebral artery. This was associated with the well-known clinical picture of alexia without agraphia accompanied by hemianopia and color-naming defect, and was confirmed by postmortem examination. The other type of pathologic isotope uptake, observed in three patients, was more laterally placed, in the basal part of the left occipital lobe, and did not reach the midline. In these cases the alexia was transient and not associated with color-naming defects.
对4例失读不伴失写症患者进行了锝-99m高锝酸盐脑扫描研究。发现有两种摄取增加的类型。一种是在后前位中线附近呈三角形，据说是大脑后动脉分布区梗死的特征。这与失读不伴失写症、偏盲和颜色命名缺陷的典型临床症状相关，并经尸检证实。在3例患者中观察到的另一种病理性同位素摄取，位置更偏外侧，在左枕叶基部，未达中线。在这些病例中，失读是短暂的，且与颜色命名缺陷无关。
