Sacrococcygeal teratoma classification

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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