PMC3658539_01
(a) Histological examination shows two distinct areas, one with islands of squamous cells in various stages of differentiation, intercellular bridges, and small keratin pearls (black dotted arrows) and the other with papillae lined by cuboidal cells with overlapping nuclei and finely dispersed optically clear chromatin (black thick arrows), (Hematoxyllin and Eosin X200). (b) The tumor shows positive nuclear stain for TTF-1 in papillary area.
ISRN.OTOLARYNGOLOGY2011-582374.001.jpg
PMC3658539_01_ISRN.OTOLARYNGOLOGY2011-582374.001.jpg
fig1
Histological examination (Figure 1(a)) showed two distinct areas, one with islands of squamous cells in various stages of differentiation, intercellular bridges, and small keratin pearls and another with papillae lined by cuboidal cells with overlapping nuclei and finely dispersed clear chromatin. Immunohistochemical stains demonstrated positive nuclear stain for TTF-1 of the papillary carcinoma (Figure 1(b)) and positive cytoplasmic CK-5 staining with of the squamous area.