Pathology All of the following are true about medulloblastoma except? A It is the most common primary malignant brain tumor in childhood B Isochrome 17q indicates poor prognosis C Most common site is brainstem (medulla) D Tumor is highly radio sensitive 💡 Explanation All of the following are true about medulloblastoma except? ✓ Correct Answer: C. Most common site is brainstem (medulla)