<P> Contusions, which are frequently associated with edema, are especially likely to cause increases in intracranial pressure (ICP) and concomitant crushing of delicate brain tissue . </P> <P> Contusions typically form in a wedge - shape with the widest part in the outermost part of the brain . </P> <P> The distinction between contusion and intracerebral hemorrhage is blurry because both involve bleeding within the brain tissue; however, an arbitrary cutoff exists that the injury is a contusion if two thirds or less of the tissue involved is blood and a hemorrhage otherwise . </P> <P> The contusion may cause swelling of the surrounding brain tissue, which may be irritated by toxins released in the contusion . The swelling is worst at around four to six days after the injury . </P>

Is the bruising of brain tissue as the result of a head injury