Which of the following is a structural cause of altered mental status?

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Distinguishing structural brain pathology from metabolic or toxic processes as causes of altered mental status.

A brain injury is a direct disruption of brain tissue, a physical change in the brain’s structure that interferes with neural circuits and leads to changes in consciousness or cognition. This structural disruption is why brain injury can cause focal neurological findings and visible changes on imaging, reflecting damage to specific areas or widespread tissue disturbance.

In contrast, hypoxia alters mental status by depriving the brain of oxygen, a metabolic insult that impairs brain function without necessarily involving a direct lesion to brain tissue. Alcohol intoxication changes neurotransmitter activity chemically, affecting brain function systemically rather than through a lasting structural injury. Hypoglycemia deprives neurons of glucose, the brain’s main fuel, again through metabolic disruption rather than a structural lesion.

So, among the options, the one that represents a structural cause is brain injury.