Chondroepitrochlearis Muscle--A Phylogenetic Remnant with Clinical Importance

Area of Science:

• Anatomy
• Developmental Biology
• Surgical Case Report

Background:

• Accessory muscles, such as the chondroepitrochlearis, are rare anatomical variations.
• These structures can potentially cause clinical symptoms due to their location and attachments.

Observation:

• An infant presented with a cord-like accessory muscle forming an axillary web.
• This anomaly caused restricted movement and abnormal shoulder shape due to humerus tethering.

Findings:

• The accessory muscle, identified as potentially the chondroepitrochlearis, was surgically resected.
• Post-operative follow-up at 7 months showed complete normalization of shoulder function and cosmetic appearance.

Implications:

• This case highlights the importance of recognizing rare accessory muscles in pediatric patients.
• Surgical intervention can effectively correct functional and cosmetic deficits caused by such anomalies.