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FIG 1. 83-year-old woman who presented with right-sided face mass.
A, Axial contrast enhance CT demonstrates a soft-tissue mass in the right buccal and masticator space with heterogeneous enhancement. Note the mass effect on the surrounding muscles of mastication and bony remodeling of the right maxilla (arrows) and mandible (arrowhead).
B, Axial T1-weighted MR image (TR/TE, 550/11) demonstrates an isointense mass in the same region (arrows).
C, Coronal T2-weighted MR imaging (TR/TE, 3950/110) reveals a diffusely hypointense mass containing areas of hyperintensity. No infiltrative changes are seen, though there is significant mass effect to the adjacent structures.
D, Axial T1-weighted MR image (TR/TE, 606/16) with gadolinium demonstrates heterogeneous enhancement of the mass.
E, Resected gross specimen shows a well-circumscribed encapsulated soft tissue mass.
F, Cut sections through the tumor reveal homogeneous tan surfaces with a whorled and slightly nodular appearance and focal areas of hemorrhage.
G, Photomicrograph reveals alternating hypocellular and hypercellular areas of spindle-shaped tumor cells with scarce cytoplasm and vesicular nuclei (hematoxylin and eosin, original magnification x10).
H, High power field demonstrates the classic "patternless pattern" of random wirelike collagen deposition with interlacing bands of fibroblast-like cells (hematoxylin and eosin, original magnification x20).
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