PMC7584270_01
(a) A CT scan axial cut soft tissue setting showing the non-enhancing soft-tissue density from the left posterior ethmoid sinus breached the lamina papyracea. (b) The mass extended downward into the maxillary infundibulum.
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F1
A computed tomography (CT) scan of the patient's brain and orbit revealed non-enhancing soft-tissue density arising from the left posterior ethmoid sinus that breached the lamina papyracea (Figure 1a) and extended into the maxillary infundibulum (Figure 1b).
(H&E, x200) Spindle cells ( ) arranged in storiform, C and S shaped embedded within a fibromyxoid stroma. Perivascular hyalinization (*) with scattered lymphocytes, eosinophils and multinucleated giant cells.
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F2
The cells were arranged in storiform, C- and S-shaped patterns (Figure 2). Blood vessels in different sizes characterised by perivascular hyalinization with scattered lymphocytes, eosinophils, and multinucleated giant cells were also identified (Figure 2).
(H&E, x400) Spindle cells ( ) are shown more clear. Slightly mitotic figures were seen (*).
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F3
Mitotic figures were only rarely seen (Figure 3).