Statin-Induced Myopathy in a Patient with Schwartz-Jampel Syndrome.

Schwartz Jampel syndrome (SJS) is a genetic disorder characterized by myotonia and chondrodysplasia. Mutations of the Perlecan gene (HSPG2), which encodes a key component of the extracellular matrix of muscle, bone, and cartilage is cause for the characteristic dysmorphisms of SJS. Clinically remarkable creatinine phosphokinase (CPK) levels are typical and can be associated with myotonia as an underlying cause in SJS patients.