Which is/are true of adenoid cystic carcinoma?

A. It is a common type of salivary gland tumor.

B. Another name is cylindroma.

C. Most patients are completely resected for cure.

D. Different histological types have different prognoses.

DISCUSSION: Adenoid cystic carcinomas (cylindromas) are commonly observed salivary gland tumors that can occur in the conducting airways. The undifferentiated solid type is associated with distant metastases, of which the cribriform and tubular types are associated with perineural and submucosal invasion. Most patients (60%) can be resected for cure.