<unk> is a<unk> that forms in the tissues of a<unk><unk> . The<unk><unk> s are classified as major and minor. The major<unk><unk> s consist of the parotid, submandibular, and sublingual<unk> s. The minor<unk> s include small mucus-secreting<unk> s located throughout the palate, nasal, and oral cavity. Malignant<unk><unk>  neoplasms account for approximately 0.5% of all malignancies and approximately 3% to 5% of all head and neck<unk> .<unk>  may be classified according to the World Health Organization into five groups: malignant epithelial<unk> , benign epithelial<unk> , soft tissue<unk> , hematolymphoid<unk> , and secondary<unk> . The pathophysiology of<unk>  depends on the histological subtype. There are no established causes of<unk> . The incidence of<unk>  is approximately 2.5 to 3.0 individuals per 100,000 individuals worldwide. The incidence of<unk>  is estimated to be 2000 to 2500 cases per year in the United States. The incidence of<unk>  increases with age; the median age at diagnosis is 64 years.<unk>  are more common in males than females. There is no racial predilection to the<unk> . Common risk factors in the development of<unk>  are age, radiation exposure, environment and occupational exposure, certain viruses, male gender, smoking, and family history. Symptoms of<unk> includes difficulty swallowing, muscle weakness on one side of the face, a lump or swelling on or near the jaw or in the neck or mouth, numbness in part of the face, persistent pain in the area of a<unk><unk> , and trouble opening the mouth widely. The optimal therapy for<unk>  depends on the stage at diagnosis. The mainstay of therapy for<unk>  is surgery. External beam radiation therapy may be used following surgery, when surgery is not possible, or would cause significant complications. Chemotherapy is considered when radiation therapy or surgery is not possible.
Salivary gland tumors
Thyroid cancer
Nasal polyp
Ear cancer
Lacrimal gland tumor
Nasal glioma
Oral cancer
Thyroiditis