This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Salivary Gland, Subject name: Surgery
Perineural invasion is seen in: 
Select and explain. 
A. Mucoepidermoid carcinoma, B. Acinic cell carcinoma, C. Adenoid cystic carcinoma, D. Pleomorphic adenocarcinoma
C: Adenoid cystic carcinoma
Answer: C: Adenoid cystic carcinoma 
Explanation: Ans. (c) Adenoid cystic carcinomaRef Bailey 26/e p723* MC type of Adenoid Cystic Carcinoma - Cribriform Pattern which is characterized by Swiss Cheese Appearance.Other name is Cylindroma* MC type of Minor Salivary gland tumor - Adenoid Cystic (Most common site - hard palate)* May invade the nerves (Most common - Facial nerve)* May invade the Haversian System of Bones* MC site of Metastasis is to LUNGS (usually multiple metastasis)