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Unusual clinical, laboratory, and muscle histopathological findings in a family with myotonic dystrophy type 2

Myotonic dystrophy type 2 (DM2) is a multisystem degenerative disorder with distinctive clinical and electrophysiological features. Recently, genetic confirmation has become available with the identification of the molecular defect, an expansion of a CCTG repeat located in intron 1 of the zinc finger protein 9 (ZNF9) gene. We present two first‐degree relatives with an athletic clinical phenotype, pathological evidence of subsarcolemmal vacuolation, and molecular genetic confirmation of DM2. When found in the proper clinical context, athleticism and pathological subsarcolemmal vacuoles should not dissuade the clinician from the possible diagnosis of DM2. Muscle Nerve, 2006