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. Author manuscript; available in PMC: 2021 Jul 21.
Published in final edited form as: Mod Pathol. 2020 Mar 10;33(8):1492–1504. doi: 10.1038/s41379-020-0513-4

FIGURE 3.

FIGURE 3.

Case 3 - (A) A lateral radiograph showed a mass with clustered peripheral calcification (arrows) in the left proximal posterior thigh. (B) Axial T1-weighted and (C) T2-weighted MR image showed a mass infiltrating the gluteus maximus and hamstring muscles. The mass consisted of an ossified component (arrow) and a non-ossified soft tissue component (curved arrows). (D) A needle biopsy showed solid fibroblastic spindle cell proliferation in a collagenized stroma. (E) Gross examination showed an ill-defined and lobulated mass with multifocal ossification involving the deep adipose tissue and skeletal muscle. (F) Both ossified and non-ossified components were present on histologic examination. In contrast to other cases with a zonal pattern, the non-ossified component composed of spindle cells infiltrated the adipose tissue with multiple haphazard foci of woven bone.