Table 3.

The Milan System for reporting salivary gland cytopathology for cystic lesions

Diagnostic category	Example of cystic salivary gland lesion
Non-diagnostic	Cystic non-mucinous fluid only
Non-neoplastic	Inflammatory cyst with amylase crystalloids
Atypia of undetermined significance	Histiocytes ± scant epithelial cells in a background of abundant mucin (cannot exclude low-grade mucoepidermoid carcinoma)
Benign neoplasm	Warthin tumor, or cystic pleomorphic adenoma
Salivary gland neoplasm of uncertain malignant potential (SUMP)	Cellular oncocytic/oncocytoid neoplasm with cystic background (differential includes Warthin tumor or oncocytic cystadenoma)
Suspicious for malignancy	Atypical cells in a mucinous background, suspicious for low-grade mucoepidermoid carcinoma
Malignant	Keratinizing squamous cell carcinoma