Sacrococcygeal teratoma classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Sacrococcygeal teratoma (SCT) is a teratoma (a kind of tumor) located at the base of the coccyx (tailbone). It is thought to be a derivative of the primitive streak.

Classification

SCTs are classified morphologically according to how much of them is outside or inside the body:

• Altman Type I — entirely external, sometimes attached to the body only by a narrow stalk
• Altman Type II
• Altman Type III
• Altman Type IV — entirely internal; this is a presacral teratoma