PMC4533478_01
CT scan showing radiolucency of the subcutaneous mass (arrow), accompanied by prominent hyper-ostosis (arrowheads) at the parietal bone (A, B). Hyperostosis is noted on a three-dimensional CT image (C). CT: computed tomography.
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F1
A computed tomography (CT) scan demonstrated a subcutaneous mass of fatty density, accompanied with cortical bone deformity and massive hyperostosis (Fig. 1).
Magnetic resonance imaging demonstrating a subcutaneous mass displays predominantly high signal intensity on both T1- (A) and T2-weighted images (B). A part of the lipomatous lesion progressed into the underlying hyperostosis (arrow).
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F2
However, a part of the lipomatous lesion extended into the skull, suggesting bone invasion (Fig. 2).
A: A gross photograph of the cut surface showed a lipomatous yellowish lesion attached to the prominent hyperostosis. Small foci of lipomatous lesions were macroscopically observed within the hyperostosis and the skull (arrows). B: A lipoma was firmly attached to the reactive hyperostosis. Islands of lipoma were involved in the hyperostosis and the skull (arrows) (H&E x10). C: No lipoblasts were observed in a higher power view (H&E x200).
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F3
When bisected, the cut surface showed a lipomatous yellowish lesion attached to the prominent hyperostosis (Fig. 3A). Those bone tissues were matured ones with reactive hyperostosis induced by parosteal lipoma (Fig. 3B, C).