A Clinical Study on Basal Cell Adenoma of the Parotid Gland:—Comparison Pleomorphic Adenoma and Warthin's Tumor—

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We studied 11 cases of basal cell adenoma (BCA) of the parotid gland in which surgery had been performed in the past 12 years to investigate the clinical and pathological characteristics and to compare the diagnosis/treatment of BCA with those of Warthin's tumor (WT) and pleomorphic adenoma (PA). Among 358 patients with benign tumors of the parotid gland who underwent surgery, 11 had BCA. All of these tumors showed a benign pattern on US, CT and MRI. The accuracy of fine needle aspiration biopsy (FNA) for diagnosis of BCA was slightly lower than for PA. Most PA and BCA lesions developed in the upper part of the parotid gland. Considering the gender difference and tumor site, it is necessary to differentiate BCA from PA rather than from WT. There were no significant differences in the duration of surgery, the blood loss, and the incidence of transient facial paralysis between surgical resection of BCA and surgery for PA or WT. BCA is the third most common of the benign parotid tumors, following WT and PA, although its incidence is low. When PA and WT are ruled out by FNA after a tentative diagnosis of benign tumor has been made based on imaging findings, BCA should be considered.