Patient: 6 months Untreated I heard that surgery is necessary, is there a symptom of crooked mouth and eyes after surgery, and does it take some time to recover? . The Department of Stomatology, 301 Hospital, Beijing, China: In 1991, the World Health Organization divided salivary gland tumors into seven categories: adenoma, carcinoma, non-epithelial cell tumor, malignant lymphoma, secondary tumor, unclassified tumor and tumor-like disease. Parotid tumors account for about 70% of all salivary gland tumors. In addition to secondary and unclassified tumors, there are about 40 species. As there are many types of parotid tumors, clinically there can only be a tendentious diagnostic opinion based on the examination, which cannot confirm the diagnosis, and sometimes it is difficult to confirm the diagnosis even by rapid freezing under the microscope. Parotid tumors usually require surgical treatment. The most common tumor is pleomorphic adenoma, or mixed tumor, which has the characteristics of multicentric growth, some exhibit incomplete envelope and have satellite lesions or have local infiltration, and removal of the tumor alone is prone to recurrence. Be sure to remove the part of the so-called normal glandular tissue or even the whole gland that contains more than the tumor. Another reason for the high recurrence rate is that the facial nerve is distributed in the parotid gland. Damage to the facial nerve causes facial palsy, and crookedness of the mouth and eyes occurs, and in order to preserve the nerve, sometimes the tumor is broken and causes implantation. In fact, for patients who have undergone multiple surgeries, the scars and nerve adhesions are so severe that sometimes it is almost impossible to preserve the nerve. Parotid surgery, especially facial nerve management, needs to be done by a qualified physician who has passed rigorous training. In general, benign tumors can preserve the facial nerve and not cause a crooked mouth and eyes. If the tumor is in close proximity to the facial nerve, temporary crooked mouth and eyes may occur and take several days or even six months to recover.