This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous System, Subject name: Pediatrics
Investigation of choice for hydrocephalus in infants: 
Select and explain. 
A. Cranial USG, B. CT Scan, C. MRI, D. X-ray skull
A: Cranial USG
Answer: A: Cranial USG 
Explanation: a. Cranial USG(Ref: Nelson's 20/e p 2814-2817, Ghai 8/e p 574-575)As the infants have an open anterior fontanelle, transcranial ultrasound is the investigation of choice, as it also avoids the risk of radiation to the baby and gives an idea about the structural details