1 MCQs in Anatomy for NEET PG
An 8-year-old boy presents with progressive headache, morning vomiting, and truncal ataxia over 3 weeks. Axial CT brain shows a midline cerebellar mass compressing the structure marked **A** in the diagram, with enlargement of the lateral and 3rd ventricles. MRI confirms a medulloblastoma of the cerebellar vermis. Which of the following best explains the ventricular enlargement pattern seen in this patient?
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