63-year-old man with right chest wall swelling. History of chest wall sarcoma. T2 hyperintense lesion under the right pectoralis major and over the right pectoralis minor muscle measuring 2.7 x 8.2 x 6.4 cm and demonstrating internal T2 hyperintensity and relative T1 isointensity relative to adjacent skeletal muscle in a heterogeneous pattern, especially on T2 weighted sequences. There is avid enhancement within this mass post gadolinium. This mass appears to insinuate with pectoralis major muscle but appears to have a relatively well demarcated plane with the pectoralis minor muscle.
Large right chest wall mass consistent with sarcoma associated with the right pectoralis major and minor muscles. This appears to invade the right pectoralis major muscle but may be free of the pectoralis minor muscle. 