Quantitative criteria of obscure thymic pathology (OTP) are obtained by morphometric study of the thymus of 102 infants with severe infectious-inflammatory processes (IIP). OTP is characterised by depression of epithelial hyperplasia in accidental involution found in 28.4% IIP and is followed by the disturbances mainly in the cell immunity system. This type of thymus pathology is associated in 69% of cases with congenital anomaly of the viscera and skeleton this allowing to regard it as a form of thymus fetal dysplasia.
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