UNILATERAL OMOHYOID MUSCLE ABSENCE: A CADAVERIC CASE REPORT A Rare variation of Omohyoid Muscle Section Case Report
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Abstract
ABSTRACT:
Introduction: The omohyoid muscle is a slender infrahyoid muscle composed of two bellies (superior and inferior) connected by an intermediate tendon. It serves as a critical anatomical landmark in cervical lymph node classification, neck dissection surgeries, and brachial plexus exploration. Variations of this muscle, though uncommon, carry clinical significance due to their proximity to major neurovascular structures.
Main Clinical Finding: During routine cadaveric dissection of the neck in a 72-year-old Indian male cadaver, the complete unilateral absence of the omohyoid muscle on the left side was observed. The right side displayed a normal omohyoid muscle with both bellies and intermediate tendon intact.
Diagnosis: Congenital unilateral agenesis of the omohyoid muscle on the left side, identified during anatomical dissection.
Intervention: No clinical intervention was required, as the case was identified during anatomical dissection. The variation was thoroughly documented with anterior and lateral photographs for educational and academic reference.
Outcome: The absence of the omohyoid was confirmed to be congenital, as there was no evidence of trauma, surgery, or pathological changes. Recognition of this variation contributes to anatomical knowledge and highlights the importance of being vigilant about such anomalies during surgeries involving the neck.
Conclusion: This case highlights a rare anatomical variation—unilateral agenesis of the omohyoid muscle—which has significant clinical implications. Awareness of such variations is essential for accurate surgical navigation, diagnostic precision, and effective medical education. Documentation and reporting of such anomalies ensure better preparedness in both clinical and academic settings.
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