KEL and choreatic disease: The most common findings in MLS are weakened Kell antigen (100%), genetic alterations in XK (100%), changes in muscle biopsy (100%, 4 myopathic, 6 neurogenic alterations, 4 mixed), elevated creatine kinase (97%), acanthocytes (96%), MRI changes (95%, mainly atrophy of basal ganglia), chorea (84%) and hyporeflexia (82%).