Cerebrovascular Disease Management

Anatomical Basis for Clinical Presentation

Left hemisphere lesions cause contralateral (right-sided) motor deficits, including hemiparesis, hemiplegia, and facial weakness, as stated by the American Heart Association 1, 2.
A left internal capsule or thalamic infarct produces right-sided weakness and right-sided sensory loss as the primary manifestations, according to the American Heart Association 1, 2.
Upper extremity motor deficits occur in approximately 77% of acute stroke patients with hemispheric infarcts, as reported by the American College of Cardiology 2.
Right-sided facial droop with forehead involvement suggests a peripheral/lower motor neuron pattern, but supranuclear (central) facial palsy from hemispheric stroke typically spares the forehead due to bilateral cortical innervation of upper facial muscles, as noted by the American College of Radiology 3.

Cerebellar infarcts cause ipsilateral (same-sided) ataxia, coordination problems, and balance difficulties—not contralateral weakness, as stated by the International Stroke Society 4, 5.
Space-occupying cerebellar infarction presents with progressive impairment of consciousness, diplopia, cranial nerve palsies, progressive ataxia, and pyramidal signs from brainstem compression, according to the International Stroke Society 4, 5.
Pyramidal signs can appear with cerebellar infarcts only when there is brainstem compression, which would be accompanied by other brainstem signs like altered consciousness, cranial nerve palsies, and respiratory changes, as reported by the American Heart Association 4, 5, 6.

"Spastic" paralysis implies upper motor neuron injury with increased tone, hyperreflexia, and spasticity—this develops over days to weeks after acute stroke, not immediately, as stated by the American College of Cardiology 2.
Frequent monitoring of level of arousal and pupillary function is essential to detect deterioration from cerebral swelling, according to the American Heart Association 6, 2.
Osmotic therapy is reasonable for clinical deterioration from cerebral swelling, though not for routine prophylaxis, as noted by the American Heart Association 6, 2.

Frequent assessment of the patient’s level of arousal and observation for ipsilateral pupillary dilation are essential in the acute phase to detect early neurological deterioration. The emergence of mid‑position pupils together with worsening motor response should prompt immediate intervention for possible cerebral swelling. 7

The presence of concurrent ataxia and hemiparesis strongly suggests involvement of deep structures such as the thalamus, pons, corona radiata, or internal capsule, and helps differentiate thalamocapsular infarcts from isolated cortical or cerebellar strokes. [8][9]