Langer's arch: a rare anomaly affects axillary lymphadenectomy

Area of Science:

• Anatomy
• Surgical Anatomy
• Human Morphology

Background:

• Langer's arch is an uncommon anatomical variation involving a muscular slip in the axilla.
• This anomaly originates from the latissimus dorsi (LD) muscle and inserts near the humerus.
• It has significant implications for surgical procedures in the axillary region.

Observation:

• A rare case of left axillary arch was identified during a modified radical mastectomy.
• The anomalous muscle slip traversed the axilla, connecting the LD muscle to the pectoralis major muscle.
• This structure was observed anterior to the axillary neurovascular bundle.

Findings:

• The observed axillary arch represented a rare anatomical variant with potential surgical relevance.
• Its presence necessitates careful preoperative assessment to avoid intraoperative injury.
• The anomaly highlights the importance of detailed anatomical knowledge in oncologic surgery.

Implications:

• Preoperative identification of Langer's arch is essential for surgical planning in the axilla.
• Awareness can prevent iatrogenic injury to the arch and associated neurovascular structures.
• Understanding such anatomical variations improves patient safety during breast cancer surgery and other axillary procedures.