system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Glycogen storage disorder due to muscle phosphorylase deficiency
assistant
The correct answer is  McArdle&;s disease: type V glycogen storage disease.Due to deficiency of muscle phosphorylase. Incidence 1 out of 1million.Ref: DM Vasudevan, 7th edition, page no: 144