PMC7240621_01
Initial images. CT: shadow of the soft-tissue density of the right maxillary sinus; T2W: well-circumscribed, smoothly marginated tumor with a peripheral low area and a central inhomogeneous area.
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Magnetic resonance imaging showed a well-circumscribed and smoothly marginated tumor with a peripheral low area and central inhomogeneous area on T1-and T2-weighted images, primarily suggesting an organized hematoma (Figure 1).
(a) Right maxillary sinus opened with endoscopic modified medial maxillectomy. (b) Tumor (3 x 2 cm) in the right maxillary sinus (with a 70  endoscope). (c) Bleeding from the feeding artery based on the anterior wall of the right maxillary sinus. (d) Feeding artery cauterized and unblocked tumor resected.
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We cauterized the feeding artery and resected the tumor en bloc with a mucosa margin of 1 cm around the stem (Figures 2 and 3).
Post-ESS images. CT: Resected tumor in the right maxillary sinus.
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We cauterized the feeding artery and resected the tumor en bloc with a mucosa margin of 1 cm around the stem (Figures 2 and 3).
(a) Papillary structure. Cell nuclei are slightly larger with coarsely granular chromatin (hematoxylin and eosin, 100x). (b, c) Immunohistochemical staining revealed tumor cells positive for thyroid transcription factor 1 (TTF-1) (positive for carcinoma arising from follicular epithelial cells) and thyroglobulin.
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Histopathological diagnosis revealed a metastatic PTC tumor to the maxillary sinus (Figure 4).