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Hereditary myopathy with early respiratory failure (HMERF) with heterozygous mutations in the titin gene (TTN) is characterized by respiratory failure developing from the early phase of limb weakness or gait disturbance. Here, we describe a characteristic distribution of muscle involvement in three members of a HMERF family with a TTN mutation. Despite the differences in severity exhibited among the father, daughter and son, the systemic imaging studies showed a similar pattern among these individuals. The semitendinosus and fibularis longus muscles were selectively affected, as described previously. In addition, we found marked atrophy in the sternocleidomastoid and psoas major muscles, regardless of the disease severity. The atrophy in selective trunk muscles observed in routine CT scans can be useful for the differential diagnosis of hereditary myopathies with heart and respiratory failure.

Selective muscular atrophy in a family with hereditary myopathy with early respiratory failure