Nodal | |
Missed pathologic nodes | 18 |
Cervical | 14 |
Retropharyngeal | 4 |
Nodes misinterpreted as pathologic | 3 |
Submandibular gland mistaken for nodes | 2 |
Changes related to tumor extension |
Missed submucosal extension | 5 |
Parapharyngeal | 3 |
Preepiglottic | 2 |
Presence or absence of cartilage invasion | 5 |
Presence or absence of perineural spread | 4 |
Underestimation of size or extent of tumor | 4 |
Overestimation of size or extent of tumor | 3 |
Changes related to primary neoplasm |
Primary cancer missed on imaging | 8 |
Oral cavity | 6 |
Pharynx | 2 |
Normal anatomy mistaken for primary neoplasm | 3 |
Missed second primary neoplasm | 6 |
Missed metastasis | 2 |
Missed middle cerebral artery aneurysm | 1 |