TABLE 5.
Characterization of Atypia of Undetermined Significance Cases
| Histologic Category | Histologic Diagnosis | No. (%) |
|---|---|---|
| Non‐neoplastic | Lymphoepithelial cyst | 14 |
| Lymphoepithelial lesion | 9 | |
| IgG4‐related sialadenitis | 6 | |
| chronic sialadenitis | 3 | |
| Granulation | 2 | |
| Lymphoid hyperplasia | 2 | |
| Fibrosis | 1 | |
| Necrosis | 1 | |
| Nodular oncocytic hyperplasia | 1 | |
| Ranula | 1 | |
| Normal | 1 | |
| Subtotal | 41 (22.2) | |
| Benign neoplasm | Warthin tumor | 59 |
| Pleomorphic adenoma | 25 | |
| Basal cell adenoma | 4 | |
| Lymphadenoma | 4 | |
| Oncocytoma | 1 | |
| Myoepithelioma | 1 | |
| Calcifying epithelioma | 1 | |
| Lipoma | 1 | |
| Schwannoma | 1 | |
| Cystadenoma | 1 | |
| Subtotal | 98 (53.0) | |
| Malignant | Malignant lymphoma | 23 |
| Mucoepidermoid carcinoma | 7 | |
| Acinic cell carcinoma | 3 | |
| Secretory carcinoma | 3 | |
| Carcinoma ex pleomorphic adenoma | 2 | |
| Squamous cell carcinoma | 2 | |
| Small cell carcinoma | 1 | |
| Epithelial‐myoepithelial carcinoma | 1 | |
| Salivary duct carcinoma | 1 | |
| Adenoid cystic carcinoma | 1 | |
| Carcinosarcoma | 1 | |
| Metastatic squamous cell carcinoma | 1 | |
| Subtotal | 46 (24.9) | |
| Total | 185 |