Abstract
This paper describes a rare case of pleomorphic adenoma originating from an accessory submandibular gland. A 28-year-old woman presented to our hospital with a mass in the left submandibular area. Imaging revealed an irregularly-shaped mass, approximately 20 mm in size, in contact with the anterior surface of the left submandibular gland. A thin layer of fat was observed between the submandibular gland and the mass, with no evident continuity, suggesting an extramandibular gland tumor. Additionally, the submandibular lymph node was enlarged, exhibiting a signal pattern similar to that of a tumor. The diagnosis was benign tumor; however, due to the possibility of malignancy, tumor excision and a neck lymphadenectomy of the Level IB region were performed. Pathohistological examination confirmed the presence of a pleomorphic adenoma, and tissue similar to that of a normal submandibular gland was present in the outer capsule of the pleomorphic adenoma. No recurrence has been observed in the nine years following surgery.
