Extraskel. Chondrosarc.
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Extraskeletal Myxoid Chondrosarcoma

A rare low-grade soft tissue sarcoma that occurs at a mean age of 50 years. It often presents as a slowly growing painful and tender soft-tissue mass, usually affecting the extremities. 40 to 45 percent are metastatic lesions at the time of presentation. On CT or plain radiography, a soft tissue mass with ring, arc, stippled, and highly opaque calcifications may be noted. They most commonly are isointense to muscle on T1 and hyperintense (isointense to fat) on T2 W images. T1W post Gd images show contrast enhancement. Low signal intensity foci of calcification are present. They may mimic a cyst or myxoma.

64-year-old male with a painless soft tissue mass in the lateral aspect of the right heel. Plain radiograph demonstrates a densely calcified mass in this region. MR demonstrates this mass to be isointense on T1 and hyperintense on T2W images, with a central area of hypointense calcification.


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