Inverted Papilloma Originating Primarily from the Nasolacrimal Duct: A Case Report and Review of the Pertinent Literature

Figure 4

(a) Hyperplastic squamous epithelium growing endophytically. The inverted papilloma is seen to arise from nasolacrimal duct epithelium (arrow). Haematoxylin and Eosin, 20x. (b) Foci of atypia amounting to moderate dysplasia. No invasive malignancy is seen. Haematoxylin and Eosin, 40x. (c) Inverted pattern of growth. Haematoxylin and Eosin, 20x. (d) Immunohistochemistry for P16 showing block positivity. P16 IHC Syntech antibody, 20x.

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