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Medcyclopaedia - Haematoma |
 | | A haematoma is the inevitable consequence of the rupture of a blood vessel, either artery, vein or capillary. |
 | | While an acute haematoma may produce a space-occupying effect owing to its size, and subsequent peripheral oedema, chronic haematoma is usually a smaller posthaemorrhagic porencephalic cavity, possibly associated with atrophic dilatation of the adjacent ventricle or subarachnoid space. |
 | | The MR appearance of a haematoma at different stages is less straightforward and varies according to physical parameters of the machine and the sequences employed and to the intrinsic composition of the haematoma itself, mainly concerning oxidation states of haemoglobin and macroscopic structure of the clot (protein concentration, clot hydration, red blood cell morphology). |
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