Fig. 3

Ossifying fibromyxoid tumor. The cut surface of the tumor is oval, gray-white and well-demarcated from the adjacent soft tissues with delicate fibrous septa (asterisk indicates) (a). The tumor is associated with a peripheral shell of metaplastic bone (arrows indicate) (b, c). Fibrous septa can be seen from the capsule into the neoplasm, separating them into cellular islands (d). Cells in this case are typically uniform, they are polygonal or spindle shape with fibromyxoid-appearing matrix (e). Clusters of calcification are within the tumor (f). Nodules of tumor cells can be seen outside of the capsule (g). Sections of the soft tissues adjacent to the tumor show clusters of tumor cells (h, j). Scale bar: 250 μm (d), 100 μm (h),50 μm (c), 25 μm (e, f, g, i)