[Glycogenesis Type II (M. Pompe). Selective failure of the respiratory musculature--a rare first symptom].

Late-onset Pompe's disease, a generalized lysosomal glycogen storage disease caused by acid maltase deficiency, usually presents as a slowly progressive muscular weakness of proximal muscles in lower limbs, followed by involvement of respiratory muscles. In the case presented here, however, respiratory failure was the first and selective symptom which caused the uncommon appearance of a patient entering our outpatient clinic on foot carrying his own artificial respirator. Intercostal muscle biopsy eventually led to the diagnosis.