Information: Asymmetry of the Anterior Scalene Muscles in Scalene Syndrome

Slideshow: T1 axial image demonstrating asymmetry of the anterior scalene muscles.

This T1 axial image demonstrates asymmetry of the anterior scalene muscles. The arrows point to the anterior scalene muscles. The muscle on the right is about 50% larger than the muscle on the left.

This can reflect either hypertrophy (overgrowth) of the muscle on the left or spasm/atrophy of the muscle on the right. This condition can cause pain and weakness in the shoulder, arm and hand. It is most often caused by whiplash in motor vehicle accidents, by trauma to the neck and shoulder, or by excessive carrying or lifting in a "repetitive strain" situation. It also occurs in some athletes who overbuild the muscle by their training routine or weightlifting.

There is loss of fat between the anterior and middle scalene muscles on the left as well suggesting that the pathology is primarily on the left.

If the diagnosis is confirmed, treatment can include injections to relax the muscle as well as surgery to cut or trim the muscle.

 


TOS Information
TOS Diagnosis
TOS Treatment
TOS Information
Proximal Entrapment
Scalene Syndrome
Asymmetry of the Anterior Scalene Muscles
Distal Entrapment in the Axilla
Entrapment in Middle Plexus at 1st Rib

TOS Diagnosis
Injection of Anterior Scalene Muscle
Open MR injection for Axillary Entrapment Diagnosis
TOS Treatment
Surgical Treatment for Thoracic Outlet Syndome
Adhesions Causing Recurrence after 1st Rib Resection