sacrococcygeal teratoma
A congenital tumor arising from the coccyx, representing the most common tumor in newborns.
Full Definition
Sacrococcygeal teratoma (SCT) is the most common tumor in newborns, arising from pluripotent cells at the tip of the coccyx. The tumor may contain elements from all three germ cell layers (ectoderm, mesoderm, endoderm) and can range from small, predominantly external masses to large, predominantly internal tumors with significant pelvic extension. Prenatal ultrasound often detects these lesions, and fetal MRI helps characterize internal extension and plan delivery. The Altman classification system categorizes SCT based on internal versus external components, which correlates with malignancy risk and surgical complexity.
Usage
Usage note: Specify Altman classification type when known; distinguish from neural tube defects.
In Context
- "Fetal MRI demonstrated a large Type II sacrococcygeal teratoma with both external and intrapelvic components." — fetal imaging report
- "The newborn required immediate surgical resection of the sacrococcygeal teratoma due to high-output heart failure." — neonatal surgery consultation