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Figure 3: (a and b) A poorly differentiated malignant tumor. Microscopy shows areas of stratified squamous epithelium with ulceration. The subepithelium shows presence of tumor with cells arranged in a lobular pattern with thin fibrous septae. The cells are large, polygonal with abundant bubbly eosinophilic cytoplasm due to vacuolation. The nucleus is vesicular with prominent nucleoli and exhibits moderate polymorphism. Mitotic figures are scanty. Areas of hemorrhage and necrosis are present. Myxoid mucinous material separating the tumor cells is seen in many areas. A patchy lymphocytic infiltration is also present. The features are suggestive of a metastatic chondroma (H and E X20)

Figure 3: (a and b) A poorly differentiated malignant tumor. Microscopy shows areas of stratified squamous epithelium with ulceration. The subepithelium shows presence of tumor with cells arranged in a lobular pattern with thin fibrous septae. The cells are large, polygonal with abundant bubbly eosinophilic cytoplasm due to vacuolation. The nucleus is vesicular with prominent nucleoli and exhibits moderate polymorphism. Mitotic figures are scanty. Areas of hemorrhage and necrosis are present. Myxoid mucinous material separating the tumor cells is seen in many areas. A patchy lymphocytic infiltration is also present. The features are suggestive of a metastatic chondroma (H and E X20)