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WHO classification of tumours of the oesophagus

Epithelial tumors

Premalignant lesions

Squamous

Intraepithelial neoplasia (dysplasia), low grade - ICD-O 8077/0
Intraepithelial neoplasia (dysplasia), high grade - ICD-O 8077/2

Glandular

Dysplasia (intraepithelial neoplasia), low grade - ICD-O 8148/0
Dysplasia (intraepithelial neoplasia), high grade - ICD-O 8148/2

Carcinoma

Squamous cell carcinoma - ICD-O 8070/3
Adenocarcinoma - ICD-O 8140/3
Adenoid cystic carcinoma - ICD-O 8200/3
Adenosquamous carcinoma - ICD-O 8560/3
Basaloid squamous cell carcinoma - ICD-O 8083/3
Mucoepidermoid carcinoma - ICD-O 8430/3
Spindle cell (squamous) carcinoma - ICD-O 8074/3
Verrucous (squamous) carcinoma - ICD-O 8051/3
Undifferentiated carcinoma - ICD-O 8020/3

Neuroendocrine neoplasms

Neuroendocrine tumor (NET)

NET G1 (carcinoid) - ICD-O 8240/3
NET G2 - ICD-O 8249/3

Neuroendocrine carcinoma (NEC) - ICD-O 8246/3

Large cell NEC - ICD-O 8013/3
Small cell NEC - ICD-O 8041/3

Mixed adenoneuroendocrine carcinoma - ICD-O 8244/3

Mesenchymal tumors

Granular cell tumor - ICD-O 9580/0
Hemangioma - ICD-O 9120/0
Leiomyoma - ICD-O 8890/0
Lipoma - ICD-O 8850/0
Gastrointestinal stromal tumor - ICD-O 8936/3
Kaposi sarcoma - ICD-O 9140/3
Leiomyosarcoma - ICD-O 8890/3
Melanoma - ICD-O 8720/3
Rhabdomyosarcoma - ICD-O 8900/3
Synovial sarcoma - ICD-O 9040/3

Lymphomas

Diffuse large B-cell lymphoma - ICD-O 9680/3
Marginal zone lymphoma of mucosa-associated lymphoid tissue (MALT lymphoma) - ICD-O 9699/3

Secondary tumors