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Acute thymic involution in fetuses and neonates with chorioamnionitis.
P Toti1, C De Felice, M Stumpo
1Institute of Pathology, University of Siena, Italy.
Human Pathology
|October 3, 2000
Summary
Chorioamnionitis, an infection during pregnancy, significantly alters fetal thymus development, leading to reduced organ size and thymocyte depletion, even without sepsis. This impacts preterm birth outcomes.
Area of Science:
- Pathology
- Neonatalogy
- Immunology
Background:
- Chorioamnionitis is a primary cause of preterm birth and fetal death.
- Subclinical chorioamnionitis has been linked to reduced thymus size in preterm infants.
- Morphologic changes in the fetal thymus due to chorioamnionitis are not well-described.
Purpose of the Study:
- To describe the morphologic modifications of the thymus gland in fetuses and neonates with chorioamnionitis.
- To investigate the impact of chorioamnionitis, with or without sepsis, on thymic pathology.
Main Methods:
- Histologic examination of thymuses from fetuses and neonates with confirmed chorioamnionitis.
- Analysis of thymic organ volume, corticomedullary ratio, thymocyte counts, and interstitial tissue changes.
- Statistical analysis (ANOVA) to assess the significance of observed changes.
Main Results:
- Decreased thymic organ volume (P < .0024).
- Reduced corticomedullary ratio (P < 10(-6)).
- Increased thymic organ complexity due to altered parenchyma-interstitial tissue relationship (P = .03).
- Severe reduction in thymocytes and degenerative changes like monocyte/macrophage infiltration of Hassall's bodies.
Conclusions:
- Chorioamnionitis, with or without sepsis, is associated with significant thymic morphologic modifications.
- These thymic changes are part of the fetal systemic inflammatory response to chorioamnionitis.
- The findings highlight a critical aspect of fetal response to intrauterine infection.