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Mucoepidermoid carcinoma arising in Warthin's tumor of the parotid gland
Author(s) -
Yamada Shinichi,
Matsuo Takemitsu,
Fujita Shuichi,
Suyama Kazutaka,
Yamaguchi Akira,
Mizuno Akio
Publication year - 2002
Publication title -
pathology international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.73
H-Index - 74
eISSN - 1440-1827
pISSN - 1320-5463
DOI - 10.1046/j.1440-1827.2002.01408.x
Subject(s) - mucoepidermoid carcinoma , pathology , parotid gland , medicine , malignant transformation , carcinoma
Malignant transformation of Warthin's tumor is extremely rare, although it is the second most common benign tumor of the parotid gland. We describe our experience of mucoepidermoid carcinoma arising in Warthin's tumor of the parotid gland in a 64‐year‐old man. He had a swelling in the left parotid‐masseteric region. The removed tumor was well encapsulated and histopathologically comprised Warthin's tumor and low‐grade mucoepidermoid carcinoma. The mucoepidermoid carcinoma infiltrated lymphoid stroma of the Warthin's tumor, but capsular invasion is not found. Considering the clinical course and physical examination, the lesion was diagnosed as mucoepidermoid carcinoma arising in Warthin's tumor because its features filled the criteria of malignant transformation of Warthin's tumor. There has been no recurrence or distant metastasis for 19 months. Histological change from Warthin's tumor to mucoepidermoid carcinoma may be implicated in squamous or goblet cell metaplasia of epithelial cells. It is considered that the neoplastic cells of Warthin's tumor acquire malignant genotypes simultaneously with this dual differentiation.