PMC4541636_01
Mass noted in the left inferior meatus during nasal endoscopic examination. S = nasal septum; IT = inferior nasal turbinate; L = lateral wall of the nasal cavity; F = floor of nasal cavity.
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F1
On nasal endoscopy, the nasal cavities were patent, but a friable mass was noted in the left inferior meatus (Fig. 1).
Axial computed tomography of the paranasal sinuses, showing a tumor abutting the nasolacrimal duct. S = nasal septum; IT = inferior nasal turbinate; M =maxillary sinus.
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F2
The mass was associated with medial displacement of the inferior turbinate and slight underlying bony thinning of the medial wall of the maxillary sinus (Figs. 2-4).
Sagittal computer tomography of the paranasal sinuses, showing a tumor abutting the nasolacrimal duct.
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F3
The mass was associated with medial displacement of the inferior turbinate and slight underlying bony thinning of the medial wall of the maxillary sinus (Figs. 2-4).
Coronal computed tomography of the paranasal sinuses, showing a tumor underneath the inferior turbinate.
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F4
The mass was associated with medial displacement of the inferior turbinate and slight underlying bony thinning of the medial wall of the maxillary sinus (Figs. 2-4).
Inner luminal cells and outer myoepithelial cells positive for cytokeratin 5/6 (magnificationx100).
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F5
Both cell populations were positive for cytokeratin 5/6 (Fig. 5) and cytokeratin 903, and variably positive for S-100.
Outer myoepithelial cells stain positive for alpha smooth muscle actin (magnificationx100).
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F6
The epithelial cells were identified by dedicated CAM 5.2 staining, whereas the myoepithelial cells were identified by dedicated alpha smooth muscle actin (Fig. 6), p63, and calponin staining.