(A) Acute endometritis. Heavy infiltration with neutrophils in endometrium (arrows) HE X100. (B) Acute endometritis. Fibrin thrombi in endometrial blood vessels (arrow) HEX100. (C) Acute endometritis. Rod shape bacilli in phagosome of macrophage (arrow) (Uranyl acetate and lead citrate) X28000. (D) Chronic endometritis. Periglandular fibrosis of endometrial glands (3-5 layers of fibroblasts) (arrow) Masson’s trichrome stain X100.