This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
Tumor with perineural invasion 
Select and explain. 
A. Adenocarcinoma, B. Adenoid cystic Ca, C. Basaal cell Ca, D. Squamous cell ca
B: Adenoid cystic Ca
Answer: B: Adenoid cystic Ca 
Explanation: .SRB&;S Manual of Surgery 4th edition pg Adenoid cystic carcinoma has got high affinity for perineural spread both axially and circumferentially, antegrade and retrograde fashion along mandibular and maxillary divisions of trigeminal nerve and facial nerve. It infiltrates nerve more proximally for long distance. Tumor may reach Gasserion ganglion, pterygopalatine ganglion and cavernous sinus.