Ipsilateral Lower Limb Ataxia in a Patient with Lower Lateral Medullary Infarction: A Motion Analysis and the Possible Mechanism of Body Lateropulsion

A 69-year-old man was admitted to our hospital because of a sudden gait disturbance. Based on the neurological examination performed upon admission, the patient exhibited ataxic movement in his right lower limb and body lateropulsion toward the right side. Magnetic resonance imaging revealed a lower lateral medullary infarction limited to the lateral surface. A motion analysis revealed ipsilateral lower-limb ataxia. Lower lateral medullary infarction can cause ipsilateral lower limb ataxia, particularly impaired hip joint coordination, resulting in body lateropulsion in dynamic conditions.