A 4-month-old boy presents to the pediatric clinic with rapidly progressive head enlargement crossing percentiles over 2 months, poor head control, delayed social smile, and intermittent projectile vomiting. On examination, he has a bulging anterior fontanelle, splayed sutures, setting sun sign, hypotonia, and early papilloedema. MRI brain shows the structure marked **A** (cystic dilatation of the fourth ventricle) communicating with the posterior fossa, complete cerebellar vermis agenesis, enlarged posterior fossa, and elevated tentorium. Supratentorial triventricular hydrocephalus is present with cortical thinning. Which of the following best describes the pathophysiological consequence of the structural abnormality marked **A** in this case?
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