A Previously Healthy 16-Year-Old Boy Is Evaluated for Progressive Headaches

A previously healthy 16-year-old boy is evaluated for progressive headaches and blurred vision that started several months ago.  The headaches are more severe upon waking up in the morning and are often accompanied by nausea and vomiting.  He takes no medications and does not use tobacco, alcohol, or illicit drugs.  Physical examination is notable for bilateral papilledema.  MRI of the brain is shown in the exhibit.  This patient's brain lesion most likely originated from which of the following cells?

A) Astrocytes
B) Ependymal cells
C) Microglia
D) Neurons
E) Oligodendrocytes
F) Schwann cells
G) Vascular endothelial cells

Correct Answer:

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