Paramedian pontine infarction. Neurological/topographical correlation

Area of Science:

• Neurology
• Neuroimaging
• Stroke Medicine

Background:

• Paramedian pontine infarcts are infrequently reported causes of pontine syndromes.
• Understanding the clinical manifestations and prognosis of these infarcts is crucial.

Purpose of the Study:

• To correlate clinical signs with magnetic resonance imaging (MRI) findings in patients with paramedian pontine infarcts.
• To clarify the clinicotopographical patterns and prognosis of these specific stroke events.

Main Methods:

• Analyzed 49 patients with acute paramedian pontine infarcts.
• Classified infarcts into three subtypes based on MRI-defined lesion location.
• Assessed patient functional status using the Rankin Disability Scale (RDS) at admission and 60 days post-stroke.

Main Results:

• Different infarct locations (basal, basal-tegmental, tegmental) were associated with distinct clinical syndromes, including dysarthria, hemiparesis, and horizontal gaze abnormalities (e.g., internuclear ophthalmoplegia).
• Patients with upper pontine lesions showed significantly better RDS scores at both assessment points compared to those with lower pontine lesions.
• Basal-tegmental infarcts in the upper pons correlated with better outcomes than those in the lower pons.

Conclusions:

• Paramedian pontine infarcts, often caused by perforating artery thrombosis, typically present with faciobrachial hemiparesis, dysarthria, sensory disturbances, and gaze palsies.
• The level of the pontine lesion, affecting the corticospinal tract, appears to be a key factor in the generally favorable prognosis observed in some cases.