COQ8A and Miyoshi myopathy: The neurologic basis of imbalance in MM includes cerebellar and/or sensory ataxia,31 peripheral neuropathy,32 vestibular dysfunction,33 and/or visual impairment.34 Cerebellar ataxia is a prominent clinical symptom in MM patients of all genetic aetiologies including POLG35 and ADCK3,36 where tandem stance (TS) is difficult.