重症脳梗塞のCT像

-脳梗塞モデル犬との対比-

抄録

The CT of acute (within a week) severe cerebral infarctions was analyzed in comparing with pathological findings of our experimental cerebral infarctions in dogs. The results obtained were as follows:
1. The CT fell into two categories. The first type represented that contrast enhancement was positive at the border zone of the cortical gray and subcortical white matters in the ischemic area. The second type showed contrast enhancement which did not limit within the border zone but occurred throughout the entire cortical parenchyma in the ischemic area.
2. The dogs in which the middle cerebral artery (MCA) was clipped unilaterally, were devided into two groups. The first group represented animals which were kept MCA clipped for 24 hours and at that time carbon particles were perfused...permanent occlusive models. The second group was that in which MCA clip was removed 4 hours after, then involved area was recirculated for 20 hours and carbon particles were perfused...recanalized models. In permanent occlusive models, carbon particles extravasated only into the border zone of the gray and white junction, while in recanalized models, carbon particles strongly extravasated both in the gray and white junction and in all cortical layers.
3. An extravasated area of the permanent occlusive models were well corresponded to an enhanced area of CT in the first type and the recanalized models were also corresponded to the second type. The second type showed a poor prognosis which might be attributable, at least in parts, to frequent occurrences of the hemorrhagic infarctions.