Cerebrospinal fluid cytomorphology in neonates

Area of Science:

• Neonatal cytology
• Cerebrospinal fluid analysis
• Pediatric pathology

Background:

• Cellular polymorphism in neonatal cerebrospinal fluid (CSF) is a known phenomenon.
• Previous studies have reported various cell types in neonatal CSF.

Purpose of the Study:

• To prospectively study the cellular composition of CSF in full-term neonates.
• To classify and characterize the cells found in neonatal CSF.
• To determine the diagnostic significance of specific cell types in neonatal CSF.

Main Methods:

• Prospective cytologic study of cerebrospinal fluids.
• Classification of cells into exogenous cells, blood and bone-marrow cells, histiomonocytes, cell aggregates, and "free" cells.
• Evaluation of cell morphology and presence of specific inclusions (e.g., fat, hemosiderin).

Main Results:

• Confirmed cellular polymorphism in neonatal CSF.
• Histiomonocytes were consistently present and associated with neonatal pleocytosis, showing varying activation states.
• Inactive histiomonocytes correlated with brain damage.
• Erythrophages and siderophages had diagnostic significance.
• Lipophages (macrophages containing fat) suggested serious developmental disorders.
• Free cells and cell aggregates were incompletely identified and require further investigation.

Conclusions:

• Histiomonocytes are a constant and significant cellular component of neonatal CSF, contributing to pleocytosis and potentially indicating brain damage.
• Specific macrophage subtypes (erythrophages, siderophages, lipophages) offer diagnostic insights into neonatal neurological conditions and developmental status.
• Further research is needed to fully characterize free cells and cell aggregates in neonatal CSF.