Unilateral calf atrophy secondary to a de novo mutation of the caveolin‐3 gene

Abstract

A 23-year-old man was evaluated for atrophy of the left calf. He had a myopathic pattern on electromyography. Light microscopy showed dystrophic changes and reduced immunostaining for dysferlin and caveolin-3. The subsarcolemmal space was enlarged, and abnormal vesicles were visible with electron microscopy. A genetic study showed a heterozygous A45T mutation at exon 2 of the caveolin-3 gene. Such a mutation has been reported previously with limb-girdle muscular dystrophy type 1C and rippling muscle disease phenotypes.