This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ultrasonography, CT, and MRI, Subject name: Radiology
Retinoblastoma best evaluated by - 
Select and explain. 
A. Ultrasonography, B. CT SCAN, C. CT SCAN + MRI, D. MRI
C: CT SCAN + MRI
Answer: C: CT SCAN + MRI 
Explanation: Ans. is 'c' i.e., CT SCAN + MRI Imaging in Retinoblastomao MRI - best for challenging retinoblastoma patient evaluation; also used to rule out optic nerve and intracranial invovlemento CT SCAN - detects calcification, can also be used for initial evaluation.o MRI + CT SCAN - best for trilateral, tetralateral, recurrent retinoblastoma, metastases from retinoblastoma