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Right Medial Pons Stroke in USMLE Neurology Using Rule of Fours Localization

The Rule of Fours is a neuroanatomical localization framework used to classify brainstem strokes based on midline versus lateral structural involvement within the midbrain, pons, and medulla. The theory posits that motor syndromes involve medial structures (e.g., corticospinal tracts) while sensory and sympathetic anomalies localize laterally, allowing for precise lesion mapping via cranial nerve distribution and tract orientation in neurology.