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A CT cross-section through a patient's brain shows an intraparenchymal hemorrhage (arrow), meaning blood within the substance of the brain. Also shown is a subarachnoid hemorrhage (arrowhead), or blood surrounding the surface of the brain; and edema (asterisk), or swelling of the brain.

Note: Images are shown for illustrative purposes. Do not attempt to draw conclusions or make diagnoses by comparing these images to other medical images, particularly your own. Only qualified physicians should interpret images; the radiologist is the physician expert trained in medical imaging.