Identify the cerebral artery and branches typically involved in variable lacunar syndromes and describe the potential clinical deficits.

Variable lacunar syndromes are often associated with occlusion of the lateral lenticulostriate branches of the middle cerebral artery (MCA) on either side. Key diagnostic features include pure motor hemiparesis, pure sensory stroke, or ataxic hemiparesis, depending on the specific location of the infarct. Clinical pearls include recognizing that these small vessel strokes can present subtly and may be missed on initial imaging. Common pitfalls include confusing lacunar strokes with cortical strokes, which typically present with additional cortical signs such as aphasia or neglect.