34 year-old woman with history of pain and swelling. Markers are placed along the posterior aspect of the upper back and right shoulder. Deep to the markers is a large fatty mass which, inferiorly, appears to lie between the trapezius and rhomboid major muscles. This mass courses superiorly and anteriorly between the paraspinal and levator scapulae muscles. In maximal cross-sectional dimension, this mass measures 7.7 x 3.7 cm and in oblique longitudinal dimension 12.7 cm. The majority of this mass is of fat signal intensity with thin septae running through the mass, but we see no dominant non-adipose component. Vascular structures also course through the mass, but we see no gross enhancement following administration of gadolinium contrast.
Fatty mass as described above, most likely representing a lipoma or atypical lipomatous tumor.