This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Radiology
The investigation of choice for meningeal carcinomatosis in CNS is: 
Select and explain. 
A. Enhanced MRI, B. SPECT, C. PET, D. NCCT
A: Enhanced MRI
Answer: A: Enhanced MRI 
Explanation: Ans. A. Enhanced MRI* Leptomeningeal carcinomatosis (LC) refers to diffuse seeding of the leptomeninges by tumor metastases.* LC occurs in 'an estimated 20% of patients diagnosed with cancer and is most commonly found in breast carcinoma, lung carcinoma, and melanoma in adults and hematogenous malignancies and primitive neuroectodermal tumor (PNET) in children.* Contrast-enhanced MRI of the brain and spine is the imaging modality of choice because of its safety, excellent contrast resolution, and multiplanar abilities.