A Case of Pleomorphic Adenoma of the Tongue

Abstract

：Pleomorphic adenoma is the most common benign tumor of salivary glands. Pleomorphic adenoma derived from minor salivary glands most commonly occurs in the palate. However, to the best of our knowledge, reports of pleomorphic adenoma on the tongue are extremely rare, with only 24 cases including the present case. The patient, a male in his 40s, had an encapsulated mass, about 20mm in diameter, on the front part of his tongue. The mass was well-demarcated and movable.On magnetic resonance imaging (MRI) examination, T2 weighted imaging showed a lesion of moderate signal with clear border and low signal rim. For a clinical diagnosis of the tumor of the tongue, we performed an excisional biopsy under general anesthesia. The final diagnosis of the extirpated specimen was pleomorphic adenoma. Anterior lingual gland (Blandin Nuhnʼs gland) and the posterior lingual gland exist in lingual glands. It was presumed to be a tumor derived from Blandin Nuhnʼs gland. About 2 years after surgery, there has been no recurrence or malignancy in clinical or radiological findings.Key words：pleomorphic adenoma(多形腺腫) ，minor salivary gland(小唾液腺) ，anterior lingual gland(前舌腺) ， Blandin-Nuhnʼs gland(ブランダン・ヌーン腺) ，posterior lingual gland(後舌腺)