Pleomorphic Adenoma of the Submandibular (submaxillary) Gland. These tumors are benign. They are removed very carefully, so as not to injure the marginal mandibular branch of the facial nerve which courses in the deep cervical fascia covering the submandibular gland. Other nerves at risk are the hypoglossal and the lingual nerves which are also intimately related to the submandibular gland.
Axial CT scan of the neck, showing the submandibular pleomorphic adenoma, depicted in the picture on the left.