Elastofibroma Dorsi

This pseudotumor represents benign reactive fibrosis, thought to result from chronic friction between the scapula and chest wall.  They are almost always asymptomatic.

Elastofibromas appear as an ill-defined soft tissue density located in the subscapular region. They are frequently bilateral, usually asymmetric in size. 

Although typically non-avid, they can demonstrate mild or even intense metabolic activity. Irrespective of their metabolic activity, these are benign lesions. 

We mention them in the body of the report only if they are unusually large or unusually FDG-avid.