PMC7474362_01
Computer tomographic scan images of the paranasal sinuses. (a) Coronal cut showing a homogenous image filling the right nasal cavity (red arrow). (b) Axial cut with contrast showing enhancing lesion compressing the right lateral nasal bone and nasal septum without bone destruction (yellow arrow).
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The rest of the sinuses were normal (Figure 1).
Pleomorphic adenoma, showing cytoarchitectural features characteristic of this tumor. Capsule and a focus of chondroid stroma (x100) (a) and a variegated growth pattern (x100) (b) are seen. Tubules containing eosinophilic material (x200) (c) and foci of squamous differentiation (x200) (d) are seen. A myxoid background in which plasmacytoid hyaline cells (modified myoepithelial cells) are seen (x400) (e and f).
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The mass was then sent for histopathology (Figure 2), which revealed respiratory-type epithelium underneath which was a tumor with partial encapsulation and a variegated appearance comprising a chondroid (hyaline cartilage) and myxoid matrix in which were tubules lined by an inner layer of ductal cells and an outer layer of myoepithelial cells.