Type III glycogen storage disease mimicking hypertrophic cardiomyopathy

A 9-year-old female patient has been experiencing hypoglycaemia and hepatomegaly since infancy. Currently, she has resting dyspnoea, tachycardia, and atypical chest pain. The echocardiographic examination revealed hypertrophic cardiomyopathy (HCM) with diastolic septum and posterior wall thickness of 42 and 16 mm, respectively ( Panel A and supplementary data: dynamic images of two-dimensional echocardiography). The echocardiographic images included the following: the left ventricular …