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Click 62 year-old male with right axillary primary dedifferentiated liposarcoma. Noncontrast T1-weighted MRI. Axial T1-weighted MR images demonstrate an intermuscular mass with intrinsic T1 signal isointense to adjacent skeletal muscle. TR = 659, TE = 10, Magnet Strength: 1.5 Tesla.

Click 62 year-old male with right axillary primary dedifferentiated liposarcoma. T1-weighted MRI following the administration of intravenous gadolinium. Axial T1-weighted MR images demonstrate an intermuscular mass with intense, heterogeneous enhancement with contrast. Contrast agent: Magnevist 20 mL, TR = 659, TE = 10, Magnet Strength: 1.5 Tesla.

Click 62 year-old male with right axillary primary dedifferentiated liposarcoma. T2-weighted MRI. Coronal T2-weighted MR image demonstrates the mass to be generally moderately hyperintense to adjacent skeletal muscle with small areas of marked hyperintensity. In correlation with fat suppressed sequence, these areas within the main portion of the tumor correspond to fluid. The round focus at the superior extent (arrow) appears to contain a small amount of macroscopic fat. Thin, linear T2-hypointense capsule-like rim and internal septa around and within the mass, respectively, are demonstrated on this sequence. TR = 4107, TE = 100, Magnet Strength: 1.5 Tesla.

Click 62 year-old male with right axillary primary dedifferentiated liposarcoma. T2-weighted MRI. Coronal T2- SPAIR (spectral adiabatic inversion recovery) MR image demonstrates T2-hyperintense mass with areas of suppressed signal in the round focus at the superior extent of the tumor, consistent with macroscopic fat. TR = 4490, TE = 60, Magnet Strength: 1.5 Tesla.

Click 62 year-old male with right axillary primary dedifferentiated liposarcoma. Computed Tomography. Axial noncontrast CT-guided biopsy image demonstrates needle position within the soft tissue mass which has similar attenuation to adjacent muscles. GE Lightspeed CT scanner. kVp = 120, mAs = 180, slice thickness = 5 mm.