This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Radiology
Investigation of choice for recurrent GIST: 
Select and explain. 
A. MIBG, B. PET CT, C. MRI, D. CECT
B: PET CT
Answer: B: PET CT 
Explanation: Ans BRecurrent GIST indicates a small residual focus which can be identified by functional imaging like PET. GIST is not a neuroendocrine tumour and hence does not show uptake of MIBG.