Table 1: Comparison of classification systems of Head and Neck NENs between WHO 2005 and WHO 2017 Blue Books.
|Salivary glands 2005||-||-||Small cell NEC||Large cell NEC|
|Salivary glands 2017||-||-||Small cell NEC (under poorly differentiated carcinoma)||Large cell NEC (under poorly differentiated carcinoma)|
|Nasal cavity- Paranasal sinuses 2005||Typical carcinoid||Atypical carcinoid||Small cell carcinoma neuroendocrine type|
|Nasal cavity- Paranasal sinuses and Skull base 2017||-||-||Small cell NEC||Large cell NEC|
|Larynx 2005||Typical carcinoid||Atypical carcinoid||Small cell carcinoma neuroendocrine type||Combined small cell – non small cell carcinoma||Paraganglioma|
|Hypopharynx, larynx trachea and para- pharyngeal space 2017||Well differentiated NEC||Moderately differentiated NEC||Poorly differentiated NEC, small cell neuroendocrine carcinoma||Poorly differentiated large cell neuroendocrine carcinoma|