ICH is categorized by the underlying etiology, if it is known. Although some ICHs may not have an identifiable etiology, they may be caused by trauma, vascular malformations, aneurysms, masses, or hemorrhagic transformation of ischemic stroke. Age and hypertension are the 2 most relevant risk factors for ICH, with hypertension being the most significant reversible risk factor. Common causes and risk factors for ICH are described in Table 1.
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