As I understand, your little 4.5years old boy is unable to do balancing activity in the normal way it should be done. As for the MRI
scan of his brain, there is calcification in bilateral globus pallidi and adjacent genu of internal capsules.
In this setting, the report says that there is calcium deposition in certain important areas of your son's brain. I would recommend a through neurological consultation for him. You have not said anything about his mental devlopment through his childhood. Your doctor might ask all details on that.