system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Most malignant tumor of salivary glands ?
assistant
The correct answer is  Ans. is 'c' i.e., Adenoid cystic carcinoma "Adenoid cystic carcinoma has been described as one of the most biologically aggressive and destructive malignant neoplasms, presenting a tendency for local recurrance and late distant metastasis throughout the course of disease." The adenoid cystic carcinoma, adenocarcinoma, squamous cell carcinoma and undifferentiated carcinoma are all agggressive malignant tumors that carry a poor prognosis regardless of treatment. The acinic cell carcinoma and the mucoepidermoid carcinoma, although undoubtedly malignant tumors with a potential for local invasion and metastatic spread, are frequently very low grade histologically and do not require the radical treatment needed for more aggressive tumors. Cysadenolymphoma (Wahin's tumor) is a benign tumor.