Left face and arm motor/sensory loss with left inferior quadrantanopsia and left hemi-neglect. Which stroke territory?

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A right MCA territory lesion best explains this pattern because neglect on the left side points to nondominant parietal involvement, and the right parietal lobe houses networks for attention to the left side of space. The left inferior quadrantanopsia indicates involvement of the right parietal optic radiations, which pass through that region. Motor and sensory loss in the left face and arm localizes to the lateral sensorimotor cortex supplied by the MCA. Taken together, these findings fit a stroke in the right MCA territory, affecting the parietal region (inferior division) and adjacent cortex. A brainstem or deeper stem stroke would more likely produce a different mix of symptoms, a left MCA lesion would cause right-sided deficits and often language problems if it’s the dominant hemisphere, and a left PCA stroke would cause right visual field loss without left neglect.