NF1 with malignant NST Within the left rhomboid and trapezium muscles is a well-circumscribed mass measuring approximately 6.5 x 6.4 x 4.3 cm in the greatest craniocaudal, transverse and AP dimensions. The mass is heterogeneously isointense on T1 sequences and hyperintense on T2 sequences and demonstrates heterogeneous enhancement following contrast administration.There is skin irregularity overlying the left shoulder and upper back relating to prior resection and reconstruction. Numerous foci of signal void are identified within the area representing susceptibility artifact from prior surgical intervention. A large amount of increased T2 signal is seen within the soft tissues surrounding the mass which likely reflect a combination of edema and postsurgical change. Following contrast administration, there is diffuse enhancement surrounding the mass which is likely reflective of edema and/or scar tissue from prior intervention.Innumerable enhancing nodules within the soft tissues consistent with known history of neurofibromatosis.
Slight interval increase in size of residual and/or recurrent malignant peripheral nerve sheath tumor.