TABLE 1:

Categorized changes in image interpretation

Type of ChangeNo. of Cases
Nodal
 Missed pathologic nodes18
  Cervical14
  Retropharyngeal4
 Nodes misinterpreted as pathologic3
 Submandibular gland mistaken for nodes2
Changes related to tumor extension
 Missed submucosal extension5
  Parapharyngeal3
  Preepiglottic2
 Presence or absence of cartilage invasion5
 Presence or absence of perineural spread4
 Underestimation of size or extent of tumor4
 Overestimation of size or extent of tumor3
Changes related to primary neoplasm
 Primary cancer missed on imaging8
  Oral cavity6
  Pharynx2
 Normal anatomy mistaken for primary neoplasm3
Missed second primary neoplasm6
Missed metastasis2
Missed middle cerebral artery aneurysm1