Which salivary gland tumor is characterized by perineurial invasion?

• A. Polymorphous low grade adenocarcinoma
• B. Adenoid cystic carcinoma
• C. Mucoepidermoid carcinoma
• D. Pleomorphic adenoma

Answer: (A)

The tumor that is particularly characterized by perineurial invasion is adenoid cystic carcinoma. This malignant salivary gland tumor is known for showing a tendency to invade surrounding neural structures, which can lead to significant clinical implications such as pain and loss of function. Perineurial invasion refers to the tumor's growth along the nerves, which is a common feature observed in adenoid cystic carcinoma and is associated with its aggressive nature and potential for recurrence.

While polymorphous low-grade adenocarcinoma does exhibit some invasive characteristics, it is not as prominently associated with perineurial invasion as adenoid cystic carcinoma. This distinction makes adenoid cystic carcinoma a unique concern in the management of salivary gland tumors. Other types of tumors, like mucoepidermoid carcinoma and pleomorphic adenoma, do not typically feature this invasive behavior along neural pathways. Understanding these characteristics is crucial for proper diagnosis and treatment planning in oral and maxillofacial surgery.