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WHO histological classification of tumors of the nasal cavity and paranasal sinuses

Malignant epithelial tumors

Squamous cell carcinoma - ICD-O 8070/3

Verrucous carcinoma - ICD-O 8051/3
Papillary squamous cell carcinoma - ICD-O 8052/3
Basaloid squamous cell carcinoma - ICD-O 8083/3
Spindle cell carcinoma - ICD-O 8074/3
Adenosquamous carcinoma - ICD-O 8560/3
Acantholytic squamous cell carcinoma - ICD-O 8075/3

Lymphoepithelial carcinoma - ICD-O 8082/3
Sinonasal undifferentiated carcinoma - ICD-O 8020/3
Adenocarcinoma

Intestinal-type adenocarcinoma - ICD-O 8144/3
Sinonasal non-intestinal-type adenocarcinoma - ICD-O 8140/3

Salivary gland-type carcinomas

Adenoid cystic carcinoma - ICD-O 8200/3
Acinic cell carcinoma - ICD-O 8550/3
Mucoepidermoid carcinoma - ICD-O 8430/3
Epithelial-myoepithelial carcinoma - ICD-O 8562/3
Clear cell carcinoma, NOS - ICD-O 8310/3
Myoepithelial carcinoma - ICD-O 8982/3
Carcinoma ex pleomorphic adenoma - ICD-O 8941/3
Polymorphous low-grade adenocarcinoma - ICD-O 8525/3

Neuroendocrine tumors

Typical carcinoid - ICD-O 8240/3
Atypical carcinoid - ICD-O 8249/3
Small cell carcinoma, neuroendocrine type - ICD-O 8041/3

Benign epithelial tumors

Schneiderian papillomas

Inverted papilloma (Schneiderian papilloma, inverted type) - ICD-O 8121/1
Oncocytic papilloma (Schneiderian papilloma, oncocytic type) - ICD-O 8121/1
Exophytic papilloma (Schneiderian papilloma, exophytic type) - ICD-O 8121/0

Salivary gland-type adenomas

Pleomorphic adenoma - ICD-O 8940/0
Myoepithelioma - ICD-O 8982/0
Oncocytoma - ICD-O 8290/0

Soft tissue tumors

Malignant tumors

Fibrosarcoma - ICD-O 8810/3
Malignant fibrous histiocytoma - ICD-O 8830/3
Leiomyosarcoma - ICD-O 8890/3
Rhabdomyosarcoma - ICD-O 8900/3
- Embryonal rhabdomyosarcoma - ICD-O 8910/3
  Spindle cell rhabdomyosarcoma - ICD-O 8912/3
  Botryoid rhabdomyosarcoma - ICD-O 8910/3
  Anaplastic rhabdomyosarcoma - ICD-O 8910/3
  Alveolar rhabdomyosarcoma - ICD-O 8920/3
  Pleomorphic rhabdomyosarcoma - ICD-O 8901/3
Angiosarcoma - ICD-O 9120/3
Malignant peripheral nerve sheath tumor - ICD-O 9540/3

Borderline and low malignant potential tumors

Desmoid-type fibromatosis - ICD-O 8821/1
Inflammatory myofibroblastic tumor - ICD-O 8825/1
Glomangiopericytoma (Sinonasal-type hemangiopericytoma) - ICD-O 9150/1
Extrapleural solitary fibrous tumor - ICD-O 8815/1

Benign tumors

Myxoma - ICD-O 8840/0
Leiomyoma - ICD-O 8890/0
Hemangioma - ICD-O 9120/0
Schwannoma - ICD-O 9560/0
Neurofibroma - ICD-O 9540/0
Meningioma - ICD-O 9530/0

Tumors of bone and cartilage

Malignant tumors

Chondrosarcoma - ICD-O 9220/3
Mesenchymal chondrosarcoma - ICD-O 9240/3
Osteosarcoma - ICD-O 9180/3
Chordoma - ICD-O 9370/3

Benign tumors

Giant cell lesion
Giant cell tumor of bone - ICD-O 9250/1
Chondroma - ICD-O 9220/0
Osteoma - ICD-O 9180/0
Chondroblastoma - ICD-O 9230/0
Chondromyxoid fibroma - ICD-O 9241/0
Osteochondroma (exostosis) - ICD-O 9210/0
Osteoid osteoma - ICD-O 9191/0
Osteoblastoma - ICD-O 9200/0
Ameloblastoma - ICD-O 9310/0
Nasal chondromesenchymal hamartoma

Hematolymphoid tumors

Extranodal NK/T cell lymphoma - ICD-O 9719/3
Diffuse large B-cell lymphoma - ICD-O 9680/3
Extramedullary plasmacytoma - ICD-O 9734/3
Extramedullary myeloid sarcoma - ICD-O 9930/3
Histiocytic sarcoma - ICD-O 9755/3
Langerhans cell histiocytosis - ICD-O 9751/1

Neuroectodermal tumors

Ewing sarcoma - ICD-O 9260/3
Primitive neuroectodermal tumor - ICD-O 9364/3
Olfactory neuroblastoma - ICD-O 9522/3
Melanotic neuroectodermal tumor of infancy - ICD-O 9363/0
Mucosal malignant melanoma - ICD-O 8720/3

Germ cell tumors

Immature teratoma - ICD-O 9080/3
Teratoma with malignant transformation - ICD-O 9084/3
Sinonasal yolk sac tumor (endodermal sinus tumor) - ICD-O 9071/3
Sinonasal teratocarcinosarcoma
Mature teratoma - ICD-O 9080/0
Dermoid cyst - ICD-O 9084/0

Secondary tumors