A 6-Month-Old Boy Is Brought to the Clinic for Routine

A 6-month-old boy is brought to the clinic for routine care.  He cannot sit with support, and his mother is concerned that his head is large for his age.  For the last week, the patient has napped more frequently and vomited at the end of sleep.  Height and weight are at the 25th percentile.  Head circumference is at the 95th percentile (increased from the 50th percentile at birth and the 75th percentile at age 4 months) .  The anterior fontanelle is bulging.  MRI of the head is shown in the image below: Which of the following is the most likely cause of this patient's condition?

A) Congenital atresia of the ventricular foramina
B) Decreased cerebrospinal fluid absorption
C) Generalized cerebral edema
D) Increased cerebrospinal fluid production
E) Intraparenchymal hemorrhage

Correct Answer:

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