<prompt> Investigation of choice for hydrocephalus in infants:Cranial USGCT ScanMRIX-ray skull  <response>: a. Cranial USGRef: Nelsons 20e p 2814-2817, Ghai 8e p 574-575As 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 