A patient presents with left face and arm motor weakness and jocularity. Which stroke syndrome is most likely?

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Multiple Choice

A patient presents with left face and arm motor weakness and jocularity. Which stroke syndrome is most likely?

The pattern points to a middle cerebral artery stroke affecting the non-dominant (right) hemisphere, specifically the superior division. The motor cortex on the lateral surface controls the face and arm more than the leg, so a superior division MCA infarct produces contralateral weakness in the face and arm with sparing of the leg. The presence of jocularity indicates frontal lobe involvement with disinhibition, which is more typical of a right (non-dominant) hemisphere stroke rather than a left one. So this combination—left face/arm weakness plus inappropriate laughing—best fits a right MCA superior division stroke. Left MCA strokes would more likely produce language deficits if the dominant hemisphere is involved, or right MCA strokes would more commonly produce neglect and behavioral changes; PCA stroke would bring visual field defects; basilar artery stroke would cause brainstem signs.

The pattern points to a middle cerebral artery stroke affecting the non-dominant (right) hemisphere, specifically the superior division. The motor cortex on the lateral surface controls the face and arm more than the leg, so a superior division MCA infarct produces contralateral weakness in the face and arm with sparing of the leg. The presence of jocularity indicates frontal lobe involvement with disinhibition, which is more typical of a right (non-dominant) hemisphere stroke rather than a left one.

So this combination—left face/arm weakness plus inappropriate laughing—best fits a right MCA superior division stroke.

Left MCA strokes would more likely produce language deficits if the dominant hemisphere is involved, or right MCA strokes would more commonly produce neglect and behavioral changes; PCA stroke would bring visual field defects; basilar artery stroke would cause brainstem signs.

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