Hair on end skull appearance in thalassaemia. But why?

In this video we explore the reasons or at least the theories behind the classic "hair on end" appearance described on skull x-ray and CT scans in patients with thalassaemia.
Thalassaemia is a good exam case which your examiner may well show you!

[@12.mayukhghosh53]

Sir This was hands down the best explanation on A radiograph depicting hair on end appearance... Greatly appreciated thank u so much.