Abstract
Salivary duct carcinoma is a high-grade tumor that mainly affects the parotid gland. Here, we reported a case of salivary duct carcinoma within the masseter muscle. The patient was a 46-year-old man who was referred to our department due to swelling of the left cheek and trismus. A renitent swelling was observed in the anterior part of the left ear, and the patient had a two-fingerbreadth oral aperture. Computed tomography revealed a 30 mm mass in the masseter muscle; therefore, fine needle aspiration cytology was performed. Although the results indicated a class IV tumor, the histological type could not be determined. Subsequently, a biopsy was performed under general anesthesia, and salivary duct carcinoma was diagnosed. Tumor resection including the masseter muscle was performed, and histopathology indicated salivary duct carcinoma, which might have been derived from an ectopic salivary gland. Radiotherapy was performed postoperatively since a part of the resection margin showed an unclear boundary. Three years have passed since treatment and no recurrence or metastasis has been observed.
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