36-year-old male with Ewing's sarcoma to right shoulder status post radiation. The patient has been called back for repeat imaging, free of charge, as the most recent study dated 4/12/2016 did not include the entire extent of the lesion. Please refer to recent report for MRI of the right shoulder dated 4/12/2016 accession #16025634. Again seen on this repeat study is a lobular mass within the right axilla. It measures approximately 3.8 cm (anteroposteriorly) x 3.1 cm (medial to lateral) x 4.9 cm (craniocaudal) suggesting a slight increase in the craniocaudal dimension of the mass, although subjectively the mass appears similar to that seen on the prior study and slight differences in dimension may simply reflect differences in patient positioning. The mass is isointense to muscle on T1-weighted images, heterogeneously hyperintense to muscle on T2-weighted images and enhances diffusely following contrast administration. The mass lies just beneath the neurovascular bundle without frank invasion of the neurovascular bundle, muscle, or bone. Several smaller lymph nodes are noted within the right axilla appearing similar to prior study. Linear enhancing foci extend from the mass towards the pectoralis muscle and breast tissue appear slightly more prominent on the current study when compared to the prior study and may represent extension of tumor.Please refer to recent MRI study dated 4/12/2016 (accession #16025634) for additional findings specific to the shoulder.
Right axillary mass and other findings as described above reflecting the patient's Ewing's sarcoma, perhaps slightly increased in size from the prior study. We do not see findings to suggest a treatment response.