This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
Parameningeal Rhabdomyosarcoma is best diagnosed by- 
Select and explain. 
A. MRI, B. CT Scan, C. SPECT, D. PET
A: MRI
Answer: A: MRI 
Explanation: A i.e. MRI PET & SPECT are functional brain imaging modalities so these cannot be used for dx of parameningeal Rhabdomyosarcoma. Other informations indicating towards answer are Investigation of choice for primary or metastatic brain tumor = MRI + Contrast (Harrison) Inv. of choice for meningeal tumors = MRI + Contrast (Ganong-2337) Inv. of choice for meningeal disease = MRI + Contrast (Harrison) MRI is excellent for soft tissue imaging & CT is best for bone imaging.