[26-year-old female patient with left pectoral swelling and pain.] [There is near fluid signal intensity between the left aspect of the manubrium and the superior fibers of the left pectoralis muscle extending over a 2.7 cm distance in the craniocaudal dimension (image 17, series 23) and 2.2 cm in the transverse dimension (image 17, series 5) consistent with tearing of superior left pectoralis muscle origin. There is approximately 1 cm of retraction of the muscle fibers in this region. Furthermore, there is asymmetric thickening, increased signal on T2-weighted images, and enhancement of the left pectoralis muscle in this region and extending laterally consistent with inflammation. There is underlying low T1 signal, increased T2 signal, and enhancement of the manubrium which likely represents reactive osteitis.
[Tearing of the superior left pectoralis muscle at its origin from the manubrium with surrounding inflammation within the muscle and bone. CT can be considered to further evaluate the bony anatomy.Findings communicated via telephone to M. Sandoval at 1131 hrs on 1/6/2016.