Neoadjuvant therapy completed. History of sarcoma. There is a mass which appears to be centered within the right proximal vastus lateralis muscle. This mass measures approximately 11.7 x 8.1 x 5.2 cm (craniocaudal x transverse x AP dimension). The mass has intermediate T1 signal, heterogeneous T2 signal, and significant enhancement on post-contrast imaging with internal areas of low signal compatible with necrosis. The inferior 2 cm of the mass is predominately cystic with multiple septations. This mass appears similar in size and signal characteristics to the prior MRI. The mass does not appear to involve the underlying bone. The vastus intermedius and rectus femoris muscles are displaced medially. There is an abundance of red marrow in the femurs.
Large mass centered within the right vastus lateralis muscle compatible with provided history of sarcoma. 