Left thigh myxofibrosarcoma

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Clinical history: 52-year old man with left thigh mass


Diagnosis: Myxofibrosarcoma


Imaging techniques:

Imaging of the left thigh was performed on a 3T MR system (Skyra, Siemens) and 64-MDCT (GE). (A) Coronal T2-weighted TIRM (TR/TE 3000/38), (B) sagittal T2-weighted TIRM (TR/TE 3000/38ms), (C) axial T1-weighted TSE (TR/TE 700/11ms), and (D) T2-weighted TSE images with Dixon fat suppression (TR/TE 2600/90ms) were acquired along with contrast-enhanced T1-weighted TSE images with Dixon fat suppression (TR/TE 700-994/11) in three orthogonal planes (E, F). Left lower extremity CTA was also performed (G, H).


Imaging findings:

Pre-contrast MR imaging demonstrates a heterogenous mass located within the left vastus lateralis with extensive soft tissue edema. The lesion exhibits predominantly intermediate to low signal intensity on T1WI and markedly heterogenous high signal intensity on FS T2WI with extensive soft tissue edema. After administration of contrast, the lesion demonstrates avid, heterogeneous enhancement. CTA demonstrates vessels feeding the lesion with enhancement of the mass.