Focal diffusive placentitis was detected in 17.1%, seropurulent deciduitis
in 37.4% cases, and amnionitis in 6.2% of cases of the full-term pregnancy.
There were 9 cases of chronic deciduitis, 7 in HIV-positive placentas and 2 in HIV-negative patients (p=0.704).
Plasma cell (chronic) deciduitis is demonstrated by the presence of plasma cells in the maternal decidua.
According to the study by Schwartz et al.,  no histopathological finding occurred with increased frequency in placentas of transmitting women even though there was a trend towards increased frequency of plasma cell deciduitis. Only 1/17 transmitting women had a placenta with low-grade neutrophilic inflammation.
In the basal plate, inflammatory cells (deciduitis) were present in 15 (39.5%) of 38 patients and 91 (26.1%) of 348 patients with and without C.
Placental histology Miscarriage group 235 Lymphocytes in chorion, acute endometritis 355 Polymorphonuclear cells in decidua 518 Subchorial fibrin, lymphocytes in decidua 564 Lymphocytes in decidua 568 Lymphocytes in decidua, hemorrhagic necrosis 460 Presence of eosinophils Control group 35 Histiocytes, rare calcifications 390 Chronic deciduitis * Ig, immunoglobulin; IHC, Immunohistochemical analysis; +, positive; -, negative.
Parabasal and basal villitis is often associated with chronic deciduitis and is reportedly seen more frequently in pregnancies from assisted reproductive technology, especially ovum-donor conceptions, (68) with implications for the understanding of aberrant maternofetal immunologic interplay (Figure 35).
Other Inflammatory Lesions.--Entities reported to be associated with villitis, such as eosinophilic/T-cell vasculitis, chronic intervillositis, and chronic deciduitis, should be noted.
(74,75) Chronic deciduitis can be defined by the extent of chronic inflammation, and the presence of plasma cells, within the basal plate (Figure 38).
Pathologic examination of the placenta demonstrated focal acute funisitis, acute chorioamnionitis with fetal surface acute arteritis and acute deciduitis
. Cultures from the maternal and fetal sides of the placenta grew predominantly MRSA and rare colonies of methicillin-susceptible S.
Also, the placental hypoxic lesions did not positively correlate with inflammatory patterns of placental injury, such as acute chorioamnionitis, chronic villitis, or plasmacytic deciduitis
, the first one being most common in group 4, with placental infections rarely associated with impaired placental function.