Presentation
Lump for several months distal femur, just above the left knee.
Patient Data
There is a well-defined hypoechoic lesion with internal vascularity adjacent to the distal femur. Appearances are not of a benign lesion, and further imaging is required for characterization.
Adjacent to the distal femoral shaft is a rounded mass lesion with well-defined borders. It has homogeneous signal characteristics: high-T2 and low-T1.
There is peripheral enhancement and enhancing edema surrounding the lesion. Apperances are concerning for an aggressive lesion, and a biopsy was suggested.
Case Discussion
Imaging findings are of a soft-tissue lesion with non-benign characteristics including internal vascularity. The differential is broad but includes soft-tissue sarcomas like synovial sarcoma or soft-tissue Ewing sarcoma.
A core biopsy confirmed that the mass lesion was a synovial sarcoma.
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