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

Classification of carcinoid tumors is based generally on the location in the primitive gut that gives rise to the tumor:

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

Carcinoid tumors of the lung can be divided into the two groups dependent on histology as follows:

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

Carcinoid tumors of the lung can also be divided into two groups dependent on location as follows:

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

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)