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The appearance and evaluation of intracranial hemorrhage on MRI (see the images below) primarily depend on the age of the hematoma and on the imaging sequence or parameters (eg, T1 weighting, T2 weighting). [1] Other influences are the site of the hemorrhage, the local partial pressure of oxygen in the tissues, the local pH, the patient's hematocrit, the local glucose concentration, the hemoglobin concentration, the integrity of the blood-brain barrier, and the patient's temperature. [2, 3, 4, 5]  Axial MR images show a hyperacute hematoma in the right external capsule and insular cortex in a known hypertensive patient. Axial T1-weighted image (T1W) shows isointense to hypointense lesion in the right temporoparietal region that is hyperintense on T2-weighted (T2W) imaging and with susceptibility appearing as low signal intensity due to blood on gradient-echo (GRE) images. A small rim of vasogenic edema surrounds the hematoma
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