A. Wrong, although keloid type collagen is a feature of solitary fibrous tumor, there was no stag-horn blood vessels. Moreover, the consistent presence of inflammatory cells and stromal degeneration supported the diagnosis of nodular fasciitis.
B. Right, the lesion was consisted of short fascicles of bland spindle cells forming storiform or tissue culture-like pattern (Pic. 3), with areas of stromal degeneration that could be detected from low magnification power (Pic. 2). Upon higher magnification, keloid type collagen (circles) and inflammatory cells (arrows) could be seen in many fields.
C. Wrong, no zoning pattern nor formation of vascular balls could be seen.
B. Right,
the lesion was consisted of short fascicles of bland spindle cells forming storiform or tissue culture-like pattern (Pic. 3), with areas of stromal degeneration that could be detected from low magnification power (Pic. 2). Upon higher magnification, keloid type collagen (circles) and inflammatory cells (arrows) could be seen in many fields.
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