Targeting secondary injury in intracerebral haemorrhage—perihaematomal oedema

Perihaematomal oedema (PHO) is an important pathophysiological marker of secondary injury following intracerebral haemorrhage. In this Review, the authors consider PHO in a novel framework and highlight the clinical relevance of the condition, both as a therapeutic target and as a surrogate marker for novel interventions that target secondary injury.