Answer
D. Adenoid cystic carcinoma
Comment
Adenoid cystic carcinomas are slow growing tumors that are more common in the salivary glands. However, the tumor may arise along the upper and lower respiratory tract.
There are several histological growth patterns described, but the most common and easily to recognize is the so-called cylindromatous pattern.
The tumor usually follows an aggressive behavior with distant metastasis.
