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Histopathological examination of intraosseous vascular granulation tissue at different stages of OS (H&E stain ×200). (A) Internal hemorrhage were observed within the bone tissues at G1 stage. (B) Granulation tissue and responsive hyperosteogeny increased at G2 stage. (C) Granulation tissue and responsive hyperosteogeny increased further at G3 stage. (D) Giant granulation tissue and responsive hyperosteogeny at G4 stage.
