PMC3350275_01
Abdominal precontrast CT shows a thick-walled, cystic, multilocular mass, measuring 10 x 10 cm in front of the right psoas and iliopsoas muscles and adjacent to the iliac vessels. Spotty calcification (black arrow) was seen in the thick, hyperdense wall. White arrow shows fluid-fluid levels.
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fig1
Spotty calcification was seen in the thick, hyperdense wall on nonenhanced CT (Figure 1).
On enhanced CT, the wall and septa were not enhanced.
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fig2
On enhanced CT the wall and septae were not enhanced (Figure 2).
The giant cell form of malignant fibrous histiocytoma contains less mature bone in the tumor (H and E x 200).
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fig3
There was an aneurismal bone cyst-appearing hemorrhagic area, with focal osteoid and mature bone in the tumor capsule (Figures 3 and 4).
Immunohistochemical CD68 staining of the malignant fibrous histiocytoma (x400).
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fig4
There was an aneurismal bone cyst-appearing hemorrhagic area, with focal osteoid and mature bone in the tumor capsule (Figures 3 and 4).
Hemorrhagic areas and aneurismal bone cyst-like areas.
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fig5
Immunohistochemically, the tumor cells were positive for CD68 and lysozyme and negative for S-100 and SMA (Figure 5).