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17th August 2023

A 17-year-old male presents to the clinic with progressive muscle weakness

A 17-year-old male presents to the clinic with progressive muscle weakness. His brother had similar symptoms and passed away in his early twenties due to heart failure. The patient is found to have elevated serum creatine kinase and a dilated cardiomyopathy on echocardiogram.

What is the most likely diagnosis?

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