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TABLE 1: Categorized changes in image interpretation
Type of Change No. of Cases
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

Type of Change	No. of Cases
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