Is placing a VP shunt a major risk to spread medulloblastoma or other malignant brain tumors into the gut?  

While most malignant primary brain tumors will NOT spread to the gut via VPS, case reports of pediatric brain tumors dominate the literature regarding this risk. Germ cell tumors are probably most commonly reported, followed by PNETs and medulloblastomas [Piatt and Garton, PMID 18431216, Kay et al.,...