Abstract: To investigate the relation between bleeding after mifepristone induced abortion and placental remains in endometrium, histopathological and immunocytochemical methods were carried out to study the abstracted (20 patients) and aborted (10 patients) tissue. Histopathological study showed that there was decidua with necrotic cells in the abstracted tissue. A lot of white blood cells could be seen in decidua and endometrium. There were also glands and extracellular materials in different stages of development. Immunocytochemical study showed that factor Ⅷ antigen and PALP were positive in vascular endothelium. There were structurally and functionlly normal vassels in the remining decidua. This indicated that a lot of white blood cells in endometrium, the different development of endometrium, and the normal blood supply in the remining decidua which helps it to live could be the cause of bleeding after mifepristone induced abortion.

Key words: To investigate the relation between bleeding after mifepristone induced abortion and placental remains in endometrium, histopathological and immunocytochemical methods were carried out to study the abstracted (20 patients) and aborted (10 patients) tissue. Histopathological study showed that there was decidua with necrotic cells in the abstracted tissue. A lot of white bl, the different development of endometrium, and the normal blood supply in the remining decidua which helps it to live could be the cause of bleeding after mifepristone induced abortion.