Fixed and dilated pupils in a child with head injury most likely indicate

• A. Normal intracranial pressure
• B. Improvement in status
• C. Deterioration without change in pupils
• D. Increased intracranial pressure or cranial nerve damage

Answer: (D)

Fixed and dilated pupils after head injury point to compression of the oculomotor nerve or brainstem due to rising intracranial pressure. When pressure climbs, the third cranial nerve can be stretched or compressed, especially the parasympathetic fibers that normally constrict the pupil. The result is a pupil that stays enlarged and unresponsive to light, signaling that the brain is under serious distress and that intracranial pressure may be increasing or there may be brainstem involvement. In a child, this is a warning sign of potential herniation and requires urgent assessment and management.

Normal intracranial pressure would typically show reactive pupils; improvement would bring better reactivity rather than fixed dilation; and deterioration without change in pupils isn’t as consistent with this specific sign.