RESUMO
Clear-cell carcinoma (CCC) of the salivary gland is a very rare malignancy. It is recently introduced in the WHO classification of salivary gland tumors. CCC is considered a low-grade tumor, which is commonly seen in elderly females. The most common intraoral sites affected by CCC are palate and tongue. CCC comprises 1% of all salivary gland tumors. CCC has a silent course and a limited nodal metastasis. A hyalinized variant of CCC has good prognosis and requires wide surgical excision with or without adjuvant radiotherapy. Microscopically, it is characterized by the presence of nests of glycogen-rich monomorphic clear cells within a hyalinized stroma. Immunohistochemistry analysis of CCC depicts tumor cells which are positive for epithelial markers and negative for S-100. Here, we report the case of a hyalinized CCC of minor glands of the palate which was misdiagnosed as poorly differentiated squamous cell carcinoma.
RESUMO
Adenomatoid hyperplasia (AH) is an uncommon, non-neoplastic swelling on the palate caused due to hyperplasia of the mucinous acini. The lesion clinically presents as a sessile tumor-like nodule resembling pleomorphic adenoma. Histopathologic findings include lobules of enlarged mucinous acini which are filled with secretory granules. The nuclei are squeezed to the basal portions, associated with focal inflammation and ductal dilatation, and a history of trauma is often elicited. Here, we report a rare case of AH of the lower lip in a 20-year-old male patient, which mimics a mucous retention cyst or mucocele.
