Group A: The endangium of cephalic vein of left forelegs hurt obviously, the bulk of endothelial cells fell off and little mural thrombus was formed in the vessel.

• B组：左前肢静脉血管内膜损伤，大部分内皮细胞脱落，管腔内可见大块附壁血栓形成，几乎充满管腔。