Perinatal White Matter Injury: Connecting Histology, Pathophysiology and Neurodevelopmental Outcomes

Area of Science:

• Neuroscience
• Developmental Biology
• Pediatrics

Background:

• Perinatal white matter injury has been recognized for over 150 years, with prematurity historically identified as a key risk factor.
• While prematurity remains significant, white matter injury also occurs in various clinical settings, often linked to hypoxic/ischemic insults and inflammation.
• Injury is categorized as focal (white matter necrosis/periventricular leukomalacia) or diffuse (diffuse white matter gliosis).

Purpose of the Study:

• To review the macroscopic and microscopic features of perinatal white matter injury.
• To explore the pathophysiology of white matter injury and its association with adverse neurodevelopmental outcomes.
• To discuss current uncertainties and future challenges in the field.

Main Methods:

• Review of existing literature on perinatal white matter injury.
• Analysis of macroscopic and microscopic pathological features.
• Correlation of injury patterns with pathophysiology and neurodevelopmental outcomes.

Main Results:

• Diffuse white matter gliosis involves reactive astrocyte proliferation and pre-oligodendrocyte injury, leading to delayed myelination.
• White matter necrosis causes focal injury to white matter components and axons.
• Axonal injury is also observed in diffuse injury, suggesting focal and diffuse forms may exist on a continuum.

Conclusions:

• Perinatal white matter injury, encompassing both focal and diffuse types, is a significant concern with long-term neurological implications.
• Understanding the spectrum of injury and its pathophysiology is crucial for predicting and mitigating adverse neurodevelopmental outcomes.
• Further research is needed to address existing uncertainties and challenges in managing this condition.