Salivary duct carcinoma of the submandibular gland presenting a diagnostic challenge: A case report

Figure 1 Radiographic imaging at the initial visit. A: Panoramic radiographic image at the initial visit. Panoramic radiograph revealed radiolucent lesion from the left maxillary lateral incisor to the right maxillary second premolar (the black dotted line); an oval radiopaque lesion similar to sialolithiasis (the white dotted line) was also observed under the right side of the mandible; B: Non-contrast computed tomography (submandibular region). A calcified body was found near the opening of the submandibular gland (the orange arrow). Swollen cervical lymph nodes and a mass in the submandibular gland were also observed.