Table 4.
Frequency of chronic inflammatory placental lesions of normal singleton pregnant women at term.
| Histologic Lesionsa | % (n/N) |
|---|---|
| Chronic inflammatory lesions | 29.9% (283/946) |
| A. Maternal inflammatory response | 29.8% (282/946) |
| Chronic deciduitis | 19.2% (182/946) |
| Lymphocytic (without plasma cells) | 10.3% (97/946) |
| Lymphoplasmacytic | 9.0% (85/946) |
| Chronic villitis of unknown etiology | 18.6% (176/946 ) |
| Low-grade lesions | 13.2% (122/927) |
| High-grade lesions | 1.2% (11/927) |
| Chronic chorioamnionitis | 12.7% (120/946) |
| Stage 1 | 3.8% (36/942) |
| Grade 1 | 3.6% (34/942) |
| Grade 2 | 0.2% (2/942) |
| Stage 2 | 7.6% (72/942) |
| Grade 1 | 6.6% (62/942) |
| Grade 2 | 1.1% (10/942) |
| Chronic histiocytic intervillositis | 0.4% (4/944) |
| Villitis of infectious origin | 0% (0/944) |
| B. Fetal inflammatory response | |
| Eosinophilic T-cell vasculitis | 0.4% (4/944) |
a
Placentas may have more than one type of chronic placental inflammatory lesions.