What is salivary gland tumor: Salivary gland is also called salivary gland, which mainly secretes saliva. There are three pairs of large glands in human body, namely parotid, submandibular and sublingual glands, and there are also some small salivary glands distributed in oral mucosa. Salivary gland tumors account for 6% of head and neck tumors, and the etiology is unknown. Various salivary gland tumors: Parotid gland tumors: Parotid gland is located on the deep side of the two cheeks and is an irregular gland with ducts leading to the oral cavity and secreting saliva. The parotid gland is artificially divided into 2 lobes, and the boundary between the 2 lobes is the important facial nerve, which has 5 branches in the facial part. The deep lobe of the parotid gland has internal carotid artery and vein, so be careful not to damage them. Most of the parotid tumors are unintentionally found to be slow-growing masses centered on the earlobe, painless and of long duration. Malignant tumors are harder in texture, but in the end, it is the pathology section that says it all. A CT scan or MRI of the parotid gland is often performed before surgery to determine the location of the tumor, i.e., to initially determine its benignity and malignancy. A fine needle aspiration biopsy can also be performed to understand the type of pathology. Surgery is an important means of treating parotid tumors. Tumors occurring in the superficial lobe of the parotid gland can be resected under the premise of dissecting out the facial nerve and protecting it properly, which can often cure the tumor without recurrence. For malignant parotid tumors that invade the facial nerve, the facial nerve may be sacrificed during surgery in order to ensure complete removal of the tumor, leaving facial paralysis as a sequela after surgery. Benign tumors of parotid gland have good prognosis with successful first surgery. Malignant tumors with early attention and timely treatment can still improve the survival rate of patients. Submandibular gland tumor: The submandibular gland is located in the bilateral lower jaw and is oval-shaped. It has glandular ducts leading into the oral cavity, opening next to the tongue ligament and secreting saliva. The benign and malignant tumors of the submandibular gland account for half of the tumors. The benign ones are mainly polypoid adenomas, while the malignant ones are commonly adenoid cystic carcinomas and mucinous epidermis-like carcinomas. The main symptom is a lump in the submandibular area, painless ones are mostly benign, malignant ones are more fast growing and accompanied by pain. Some tongue numbness and tongue pain are mainly described. The examination by specialist is important. After diagnosis, all should be surgically removed. Surgical removal should protect the extra maxillary artery and the mandibular margin branch of the lingual nerve, sublingual nerve and facial nerve. The postoperative effect is worse than parotid tumors, mainly because there are more malignant tumors in the submandibular gland, especially adenoid cystic carcinoma, which is prone to distant metastasis. Sublingual gland tumors: As the name implies, the sublingual gland is located under the tongue, in the sublingual space under the mucosa of the floor of the mouth, and the gland is flat. Sublingual gland tumors are rare, accounting for about 1% of salivary gland tumors, and most of them are malignant. Malignant tumors of the sublingual gland are not easily detected by the patient, and when there is no positive sign of numbness or tongue pain on one side of the tongue, the specialist should palpate the sublingual area, and if there are hard nodules, malignant tumors should be highly suspected, and the diagnosis can be made by combining with photographs of the submandibular gland. Small salivary gland tumors: Small salivary glands are located in mucosal tissue and widely distributed, including soft palate, hard palate, lips, cheeks, tongue, nasal cavity, larynx, nasopharynx and so on. Small salivary gland tumors account for 15% of salivary gland tumors, with benign and malignant accounting for about half of each. Symptomatic masses in each of the above mentioned areas are subject to biopsy. Treatment is mainly surgical, with good results for benign tumors. Malignant tumors have different prognosis depending on the type of pathology, and the overall outcome is not good.