[Morphological criteria for thymic dyschronias in extremely low birth weight fetuses].

The paper emphasizes the importance of tissue malformations (dyschronias) in the development of immunodeficiency states in extremely low birth weight neonates. Thymuses from 115 fetuses at 22-27 weeks post-conception age were examined by immunohistochemical and electron microscopic studies. Two types of thymic structural changes were identified in fetuses developing during transplacental infection. The differential diagnostic signs of thymic tissue malformations were justified in extremely low birth weight fetuses.