This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hydrocephalus, Subject name: Pediatrics
Which of the following is not a cause of communicating hydrocephalus? 
Select and explain. 
A. Choroid plexus papilloma, B. Vein of Galen malformation, C. Achondroplasia, D. Meningeal metastasis
B: Vein of Galen malformation
Answer: B: Vein of Galen malformation 
Explanation: - Vein of Galen causes Obstructive or Non-communicating hydrocephalus. Causes: COMMUNICATING HYDROCEPHALUS NON-COMMUNICATING HYDROCEPHALUS C - Choroid plexus papilloma A - Achondroplasia M - Meningeal malignancy or metastasis P - Post hemorrhagic M - Mass lesion (ICSOL) A - Abscess A - Aqueductal stenosis A - Arnold Chiari malformation D - Dandy walker malformations H - Hematoma I - Infections (Toxoplasma, mumps, Neurocysticercosis) V - Vein of Galen malformations