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Bilateral Congenitally Absent Trapezius Musculature and Anomalous Scapuloclavicular Accessory Muscle: A Case Report
Naomi Kelley1, William Curtis, Nathan T Morrell
1Department of Orthopedic Surgery, University of New Mexico School of Medicine, Albuquerque, New Mexico.
Case:
An otherwise healthy 10-year-old boy presented with severe bilateral shoulder dysfunction because of lateral scapular winging. He underwent bilateral modified Eden-Lange tendon transfers, resulting in near-normal restoration of shoulder range of motion at the 1-year follow-up. Intraoperatively, he was found to have bilateral absent trapezial muscles and an anomalous scapuloclavicular muscle spanning from the superomedial scapula to the posterolateral clavicle.
Conclusion:
This case represents the only known report of bilateral absent trapezius muscles without involvement of other trunk musculature or congenital abnormalities. In addition, the patient exhibited a previously unidentified anomalous muscle.
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