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Computed tomography (CT) image showing a subarachnoid hemorrhage (bleeding in the area between the brain and the space surrounding the brain) in a patient who experienced a sudden, severe headache, followed by unconsciousness.

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.