Inferior Trapezius Muscle Agenesis and Scapular Dyskinesis in a 58 Year-Old Black Male Donor: A Cadaveric Case Report

Amanda Samuel; Kayla Wands; Guinevere Granite; Elizabeth Maynes; Gary Wind; Jordan Dimitrakoff; Kerrie Lashley; Maria Ximena Leighton

doi:10.61797/ijcsav.v5i1.305

Amanda Samuel F. Edward Hebert School of Medicine, Uniformed Services University of the Health Sciences, Bethesda, USA
Kayla Wands F Edward Hebert School of Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA
Guinevere Granite Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA https://orcid.org/0000-0003-3953-2250
Elizabeth Maynes Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA
Gary Wind Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA
Jordan Dimitrakoff Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA
Kerrie Lashley The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD 20814, USA
Maria Ximena Leighton Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA

DOI: https://doi.org/10.61797/ijcsav.v5i1.305

Keywords: Trapezius muscle, Agenesis, Scapular dyskinesis, Semispinalis capitis muscle deviation, Abnormality

Abstract

A functionally significant abnormality was observed in a 58 year-old Black male donor with a cause of death of thyroid cancer. He exhibited left inferior trapezius muscle agenesis as well as scapular dyskinesis. The left scapula is shown pressing into the adjacent vertebral bodies of C7 and T1, which resulted in deviations in the location of the left semispinalis capitis, semispinalis cervicis, and splenius cervicis muscles. This resulted in compromise of the left levator scapulae muscle. It is suspected that these abnormalities would have resulted in functional limitations in arm movement, particularly in adduction. A literature review was completed to understand the significance of these abnormalities.