Objective: An aberrant subclavius posticus muscle was found during routine dissection of the left infraclavicular fossa of a 60-year-old male cadaver.
Presentation: This aberrant muscle arises antero-medially, from the costoclavicular ligament, runs postero-laterally, over the trunks of the brachial plexus, and postero-lateral has a common insertion with the omohyoid muscle.
Conclusion: The presence of such an aberrant muscle may cause a dynamic compression of the subclavian artery and brachial plexus.
Keywords: Aberrant subclavius posticus muscle; Muscle anomaly; Thoracic outlet syndrome.
© 2018 The Author(s) Published by S. Karger AG, Basel.