Figure 4: Morphological characteristics of groups 1 and 2. (a) Group 1: an infiltrate zone. Macrophages lying loosely are observed with the cytoplasm containing light granules. Erythrocytes effused out of the vessels in the image. (b) Group 1: infiltrate zone. Macrophages and newly formed capillary tubes are observed with an erythrocyte inside. (c) Group 1: penumbra. The cells of an infiltrate, a neuron, and a vessel with a thick wall in the section. (d) Group 1: penumbra. A blood vessel has hypertrophied walls; a circle of macrophages is absent. Perivascular edema. Semithin section. (e) Group 2: infiltrate zone. Branched vascular tree is filled with erythrocytes. (f) Group 2: penumbra zone. Infiltrate cells and venules with small diameters are observed. The wall of one of the vessels is thickened. (g) Group 2: infiltrate zone. Tightly packed macrophages filled with green granules are observed. Cross-section of a large vessel surrounded by a sphere of macrophages can be identified. (h) Group 2: rxternal part of the cortex, where there are hypertrophied vessels outside of the zone of injury. The scale bars in (a)–(g) are 20 μm, and in (h), 100 μm.