What CT head finding was reported in the ED case with loss of consciousness after a fall?

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This item tests recognizing subdural hematoma on head CT and how its size and location relate to injury after a fall. A subdural hematoma arises from tearing of bridging veins and is common after blunt head trauma, especially in older adults. On CT, it typically appears as a crescent-shaped collection along the brain surface that can cross sutures. A small right‑sided subdural with mild mass effect fits a scenario where the bleed is limited in size but still exerts some pressure on the brain, enough to cause loss of consciousness without producing a large midline shift or severe deficits.

The other options don’t fit as well: a large left subdural hematoma would usually show more pronounced mass effect and symptoms; no acute intracranial abnormalities would not explain the loss of consciousness after trauma; an epidural hematoma is classically lens-shaped and often linked to a skull fracture with a potential lucid interval, not a crescent-shaped subdural.