Main clinical features
|
characterized by late adult onset in ankle or finger extensors, with vocal cord and pharyngeal weakness
first symptoms developed at the age of 35–57 years and the most frequent initial manifestation was ankle dorsiflexion weakness and foot drop (PMID: 19344878))
slowly progressive course with involvement of the feet and hands and eventually an effect on shoulder and pelvic muscles; vocal cord or swallowing dysfunction ; EMG and nerve conduction studies indicated a myopathy, and the levels of serum creatine phosphokinase (CPK) were usually only mildly or moderately elevated |