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Epidural hematoma: A 20-year-old man presented with a brief loss of consciousness following a fall from standing height. He had a brief lucid interval then became progressively less responsive. A computed tomography scan of the head reveals effacement of the third ventricle, quadrigeminal cistern, and compression of the anterior and posterior horns of the lateral ventricle. A lenticular-shaped hyperdense area consistent with an acute epidural hematoma is seen on the right. (L.S.)