Subdural haemorrhage – collection of blood between the dura and…

Subdural haemorrhage – collection of blood between the dura and arachnoid mater of the meninges. The crescent shape of subdural haematoma is classically taught as the major method of distinguishing it from the more typically lentiform shaped extradural haematoma, however there are other helpful distinguishing signs. Due to the physical structure of the meninges subdural blood is able to cross skull sutures and extend along dural reflections (falx and tentorium) while extradural blood cannot. The above case shows blood which on shape assessment could be extradural or subdural in location, however the fact that it crosses the lambdoid suture means it must be subdural. 

from our tumblr blog: http://radiologysigns.tumblr.com/post/27100256742

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