case_images: PMC2996005_01
case_images: Papillary luminal proliferation with intraepithelial crypts filled with mucin
case_images: JOMP-14-12-g001.jpg
case_images: PMC2996005_01_JOMP-14-12-g001.jpg
case_images: F0001
case_images: Microscopically, the specimen showed a nonkeratinized epithelial lining with areas of papillary growth enclosed with intraepithelial crypts that were either empty or filled with mucin [Figure 1].
case_images: Epithelial plaque showing clear cells and epidermoid-like cells
case_images: JOMP-14-12-g002.jpg
case_images: PMC2996005_01_JOMP-14-12-g002.jpg
case_images: F0002
case_images: Many mucous cells, clear cells and few cells resembling that of epidermoid cells were also observed [Figure 2].
case_images: Epithelial sphere or epithelial plaque showing mucous cells
case_images: JOMP-14-12-g003.jpg
case_images: PMC2996005_01_JOMP-14-12-g003.jpg
case_images: F0003
case_images: Focal areas depict epithelial thickening or plaque formation [Figure 3].
case_images: Cystic spaces in capsule filled with mucin
case_images: JOMP-14-12-g004.jpg
case_images: PMC2996005_01_JOMP-14-12-g004.jpg
case_images: F0004
case_images: Many cystic spaces filled with mucin were evident in the fibrous connective tissue capsule [Figure 4].
case_images: Mucicarmine stain: Mucous cells and mucous pooling showing positivity
case_images: JOMP-14-12-g005.jpg
case_images: PMC2996005_01_JOMP-14-12-g005.jpg
case_images: F0005
case_images: The presence of mucin was confirmed by mucicarmine staining [Figure 5].
case_images: Alcian blue stain (acetate buffer, pH 2.5) showing positivity for mucous cells and mucous pooling
case_images: JOMP-14-12-g006.jpg
case_images: PMC2996005_01_JOMP-14-12-g006.jpg
case_images: F0006
case_images: Mucous cells and mucous pooling showed positivity to alcian blue and PAS, suggestive of acidic mucin [Figures 6 and 7].
case_images: PAS stain: Clear cells showing positivity (without diastase)
case_images: JOMP-14-12-g007.jpg
case_images: PMC2996005_01_JOMP-14-12-g007.jpg
case_images: F0007
case_images: Mucous cells and mucous pooling showed positivity to alcian blue and PAS, suggestive of acidic mucin [Figures 6 and 7]. Clear cells were positive for PAS without diastase and negative for PAS with diastase, indicating their content of glycogen [Figures 7 and 8].
case_images: PAS stain: Clear cells becoming empty again after using diastase (indicating the presence of glycogen)
case_images: JOMP-14-12-g008.jpg
case_images: PMC2996005_01_JOMP-14-12-g008.jpg
case_images: F0008
case_images: Clear cells were positive for PAS without diastase and negative for PAS with diastase, indicating their content of glycogen [Figures 7 and 8].