Isolated ring finger palsy due to cortical infarction of the primary motor cortex hand area

Introduction: Isolated hand paralysis caused by small cortical infarction is rarely observed and may be misdiagnosed as peripheral nerve lesion when presenting with predominant involvement of the ulnar- or radial-sided fingers. We report a case of isolated palsy of the ring finger due to cortical infarction. Case report: A 68-year-old right handed man suddenly developed numbness in his right hand and right facial side followed by weakness of his right ring finger. Examination showed weakness particular in extension of the ring finger (MRC grade 3/5) whereas flexion, abduction and adduction were only mildly impai…