Fig. 4

Histological findings. Histological findings at low magnification in each group (a: Group 1, b: Group 2, c: Group 3) showed that fibrin was present in the lung parenchymal surface (in all groups), and in Groups 1 and 2, it extended into the lung parenchyma. Histological findings at high magnification in each group (d: Group 1, e: Group 2, f: Group 3) revealed that in Groups 1 and 2, fibrin was widely observed in the deep regions of the lung parenchyma (marked with *), while in Group 3, only minimal fibrin was evident within the lung parenchyma