Abstract
We describe two cases of ossified soft tissue tumors of the retroperitoneum. Computed
tomographic and magnetic resonance imaging both revealed retroperitoneal masses consisting
of two components—densely ossified and lipid-rich components. In one case, a 50-year-old
man, a histological diagnosis of dedifferentiated liposarcoma with osteosarcoma was
made based on the needle biopsy of the two components. In another case, a 54-year-old
man, surgical resection of the complex perirenal mass was performed and the same diagnosis
was made. Although an ossified component represent high-grade lesion, the fatty component
is an important clue to the diagnosis of dedifferentiated liposarcoma. The imaging
features may be similar to those of malignant mesenchymoma, which is not a currently
used term.
Keywords
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Article info
Publication history
Published online: June 03, 2008
Accepted:
April 3,
2008
Received in revised form:
April 1,
2008
Received:
January 10,
2008
Identification
Copyright
© 2009 Published by Elsevier Inc.
