PMC6279985_01
A: On MRI an ovoid mass lesion seen in the right parieto-occipital region measuring 10 x 7 x 4 cm with peritumoral edema. B: The tumor showed intermediate-low signal intensity in the T1-Weighted Image (T1WI). The mass was attached to tentorium and was seen extending into the right transverse sinus.
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Given the imaging characteristics, a provisional diagnosis of a meningioma was made (Fig. 1A and B).
A: Photomicrograph depicting a spindle cell tumor with a "PAtternless-pattern with hypercellular and hypocellular areas. (H& E-40 X). B: Tumor cells are spindle shaped and collagen fibres are seen to separate them. Hypercellular areas showed interlacing fascicles of spindle-shaped cells with moderate amount of eosinophilic cytoplasm and oval to elongated nuclei exhibiting variable pleomorphism. (H&E-200X). C: Reticulin fibres are seen to separate the tumor cells (RETICULIN-200X). D: On IHC, CD 99 Is strongly positive in tumor cells. (100x). E: Stat 6 strongly positive in tumor cells (100X).
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With these results, hemangiopericytoma was ruled out, and a diagnosis of SFT was made (Fig. 2A-D).