●。| Morphology o变质渗出期(1 month) mucoid degeneration and fibrinoid necrosis serous. fibrinous exudate leukocytes infiltration complete resolution fibrosis granulomasMorphology  变质渗出期(1 month) mucoid degeneration and fibrinoid necrosis serous, fibrinous exudate leukocytes infiltration complete resolution fibrosis granulomas