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Disruption of Cerebellar Granular Layer as a Consequence of Germinal Matrix Intraventricular Hemorrhage in Extreme Prematurity: An Acute Direct Mechanism Too?
Pediatric Neurology 2024 March
Cerebellum is an important brain structure for the future development of motor, cognitive, and behavioral abilities in children. This structure undergoes its most significant growth during the third trimester of pregnancy. Prematurity gathers several risk factors for cerebellar impairment and underdevelopment, and among them is ventricular dilatation following germinal matrix intraventricular hemorrhage (GMH-IVH). In this report, we illustrate how this prevalent complication associated with prematurity may induce secondary cerebellar cortical damage. A premature male born by an emergency Caesarean section displayed massive GMH-IVH at brain ultrasound performed after three hours of extrauterine life and died after 18 hours of life, despite maximized vital support. We report a postmortem histopathological specimen of the cerebellar cortex showing the disruption of the external granular layer (EGL) by hemorrhagic content flowing from the supratentorial ventricles into the fourth ventricle and cisterna magna. The expansion of the ventricular system and the presence of blood in the lateral ventricles can cause inflammation and damage to the cerebellar gyri. Experimental models have shown a thinning of the EGL, suggesting that blood surrounding the cerebellum has a harmful action. Additionally, a sudden influx of cerebrospinal fluid from the lateral ventricles may directly contribute to cerebellar damage, indicating that this may be another way in which the cerebellar gyri are impaired during acute severe GMH-IVH. This is the first histopathologically confirmed case of acute disruption in the cerebellar cortex during a GMH-IVH in a premature baby.
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