ABSTRACT
The question of the existence of penumbral tissue in primary ICH is best addressed in two parts. The first is the more specific question of an ischemic penumbra, as defined in previous chapters. The second is to consider the penumbra in a more general sense; cerebral tissue that is not immediately injured by the effects of the acute event, but also at risk for secondary progressive damage subacutely or over even longer periods. We shall make the case that there is little to support the existence of an ischemic penumbra, but substantial evidence for the more general definition.
