Clinical and pathologic aspects of recurrent placental villitis.

In a retrospective survey, recurrent villitis was identified in ten of 59 patients in whom placental villitis had been diagnosed. The ten patients had a total of 41 pregnancies, with a reproductive loss of 60 per cent. In addition to enhanced fetal losses in all trimesters of gestation and postnatally, the incidences of fetal growth retardation and premature delivery were increased. There was no evidence of recent TORCH (toxoplasma, rubella, cytomegalovirus, herpes) infection, but all patients tested had rubella immunity. In six patients genital cultures were positive for gonorrhea and assorted microorganisms. Uterine abnormalities, including two septate uteri, one incompetent cervix, one submucosal leiomyoma, and one retroflexion, were common, and vaginal bleeding had occurred in five patients. Other factors included obesity (five patients) and clinical and laboratory evidence of autoimmunity (four of the five patients tested). In a control group of 20 patients with nonrecurrent villitis, the perinatal loss rate (37 per cent) was lower, and the incidences of positive cultures, uterine structural anomalies, obesity, and autoimmunity were also lower. Placental histologic findings included decidual plasma cell and intervillous fibrin and histiocytic infiltration, in addition to villous inflammation. These lesions, although consistent for a given patient, defined two clinically relevant groups of patients. The results of this study suggest that recurrent villitis is more frequent than previously reported, that it is associated with high perinatal mortality, and that immunologic and structural abnormalities in the host may play a role in its pathogenesis.