Carcinoid syndrome classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Parminder Dhingra, M.D. [2]

Overview

Based on the location of tumor, carcinoid tumor may be classified into either foregut, midgut, or hindgut carcinoid tumors.

Classification

1. Carcinoid tumor in the gastrointestinal tract

Based on the location in the primitive gut

Carcinoid tumors of the gastrointestinal tract can be divided into the three groups based on the hlocation in the primitive gut:

• Foregut carcinoid tumors
• Midgut carcinoid tumors
• Hindgut carcinoid tumors

2. Carcinoid tumor in the lung

Based on histology

Carcinoid tumors of the lung can be divided into the two groups based on the histology:

• Typical carcinoid tumors of the lung
• Atypical carcinoid tumors of the lung

Based on location

Carcinoid tumors of the lung can also be divided into two groups based on the loaction:

• Bronchial carcinoid tumors: central lesions
• Peripheral pulmonary carcinoid tumors: peripheral lesions

3. Carcinoid tumor in the ovary

Carcinoid tumors of the ovary are divided into four main types:

• Insular type: most common and the only type that is associated with the carcinoid syndrome
• Trabecular type
• Strumal type: second commonest type
• Mucinous type (goblet cell 4)