PMC8101653_01
A - MRI T2 weighted image displaying the tumor extension; B - PET-CT scan demonstrating a fluorodeoxyglucose (FDG) avid tumor; C - Whole body positron emission tomography-computed tomography (PET-CT) scan without distant metastases.
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A magnetic resonance imaging (MRI) scan of the paranasal sinuses and the neck revealed a heterogeneously enhanced expansile soft tissue mass arising from the left upper alveolus, which measured 6.4 x 5.2 x 5.6 cm (Figure 2A). A positron emission tomography-computed tomography (PET-CT) scan revealed a primary avid maxillary tumor (Figure 2B); however, there was no metastatic lesion (Figure 2C).
Photomicrographs of the tumor. A - subepithelial irregular vascular tumor (H&E, 10X); B -highly pleomorphic epithelioid tumor cells lining the vascular spaces (H&E, 40X); C - the tumor cells were diffusely positive for CD31 (10X); D - positive reaction to FLI-1 (10X); E - focally positive for CD34 (40X); F - focally positive for AE1/AE3 (10X).
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On immunohistochemistry (IHC), the tumor cells were positive for CD31 (Figure 3C), FLI-1 (Figure 3D), CD34 (Figure 4A) and focally for AE1/AE3 (Figure 4B).
Photomicrographs of the tumor. A- Immunohistochemical reaction focally positive for CD34 (40X); and for AE1/AE3 in B (10X).
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On immunohistochemistry (IHC), the tumor cells were positive for CD31 (Figure 3C), FLI-1 (Figure 3D), CD34 (Figure 4A) and focally for AE1/AE3 (Figure 4B).