An Intraoperative Encounter With Langer's Axillary Arch and Its Clinical Significance.

Area of Science:

• Anatomy
• Surgical Oncology
• Musculoskeletal System

Background:

• Langer's axillary arch (LAA) is the most frequently observed accessory muscle during axillary procedures.
• Minimally invasive axillary surgery is increasingly common in breast cancer treatment.

Observation:

• A case report details a 55-year-old female patient undergoing right wide local excision and sentinel lymph node biopsy.
• An aberrant muscle slip, identified as LAA, was observed traversing the axilla anterior to neurovascular structures.
• The muscle originated from the latissimus dorsi and inserted into the pectoralis major.

Findings:

• The aberrant muscle slip (LAA) was identified during intraoperative examination.
• Current literature on LAA and its surgical relevance is reviewed.

Implications:

• Failure to recognize LAA during axillary surgery can lead to suboptimal regional control.
• Undetected LAA may compromise oncological treatment efficacy.
• Potential for neurovascular injuries increases if LAA is not identified and managed appropriately.