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Table 4 The World Health Organization classification (2010)

From: Acute appendicitis, inflammatory appendiceal mass and the risk of a hidden malignant tumor: a systematic review of the literature

Appendiceal carcinomas.  
• Adenocarcinoma 8140/3  
• Mucinous adenocarcinoma 8480/3  
• Low-grade mucinous neoplasia 8480/1  
• Signet-ring cell formation carcinoma 8490/3  
• Undifferentiated carcinoma 8020/3  
Neuroendocrine appendix neoplasias.  
• Neuroendocrine tumors (NET).  
• NET G1 (carcinoid) 8240/3  
• NET G2 8249/3  
• Neuroendocrine carcinomas (NEC) 8246/3  
• NEC large cells type 8013/3  
• NEC smal cells type 8041/3  
• Mixed tumor:  
• Mixed Adenoneuroendocrine carcinomas 8244/3  
• Serotonin-producing endocrine carcinoma 8241/3  
• Globet cell carcinoid 8243/3  
• Tubular carcinoid 8245/1  
• Peptide-producing/ Glucagon-producing large cell tumor PP/PYY 8152/1