Short answer · Medically reviewed summary · Last updated: 2026-05-08
TL;DR: Sacrococcygeal teratoma (SCT) is a rare germ cell tumor that develops at the base of the tailbone (the coccyx) in a developing fetus. While most cases are diagnosed prenatally or at birth, effective surgical management often leads to excellent long-term outcomes for children affected by this condition. What exactly is a Sacrococcygeal Teratoma? A Sacrococcygeal Teratoma is a tumor composed of various tissue types—such as bone, nerve, or hair—that arises from the sacrococcygeal region.
What is Sacrococcygeal Teratoma
What is Sacrococcygeal Teratoma? Plain-language, medically reviewed definition plus the lived reality told by patients.
TL;DR: Sacrococcygeal teratoma (SCT) is a rare germ cell tumor that develops at the base of the tailbone (the coccyx) in a developing fetus. While most cases are diagnosed prenatally or at birth, effective surgical management often leads to excellent long-term outcomes for children affected by this condition.
What exactly is a Sacrococcygeal Teratoma?
A Sacrococcygeal Teratoma is a tumor composed of various tissue types—such as bone, nerve, or hair—that arises from the sacrococcygeal region. Because it originates from primitive germ cells, a Sacrococcygeal Teratoma can grow rapidly during fetal development, potentially impacting the circulatory system or nearby pelvic organs. It is the most common tumor found in newborns, occurring in approximately 1 in every 35,000 to 40,000 live births.
How is a Sacrococcygeal Teratoma classified?
The Altman classification system is used to categorize a Sacrococcygeal Teratoma based on how much of the tumor is located outside the body versus inside the pelvis and abdomen:
- Type I: Predominantly external, attached to the tailbone.
- Type II: External mass with a significant internal pelvic component.
- Type III: External mass with a major extension into the abdomen.
- Type IV: Entirely internal, located within the presacral space (often harder to detect initially).
Who is typically affected by this condition?
Sacrococcygeal Teratoma cases are seen significantly more often in females than in males, with a ratio of approximately 3:1 or 4:1. While the exact cause is not fully understood, it is generally considered a sporadic event rather than an inherited genetic condition. At DiseaseMaps.org, 40 people with Sacrococcygeal Teratoma have already joined our community to share their experiences and support one another through the treatment journey.
What makes a Sacrococcygeal Teratoma unique?
Unlike many other pediatric tumors, a Sacrococcygeal Teratoma is usually benign (non-cancerous) at the time of birth, especially when detected early. However, the risk of malignancy increases with age if the tumor is not surgically removed. Because of this, early surgical intervention is the standard of care to ensure the best possible prognosis for those living with Sacrococcygeal Teratoma.
Next steps
- Consult with a pediatric surgeon or a fetal medicine specialist to discuss monitoring and surgical options.
- Join our community at DiseaseMaps.org to connect with other families who have navigated this diagnosis.
- Request genetic counseling if you are concerned about recurrence risks in future pregnancies.
Medical disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment.
References
- NIH Genetic and Rare Diseases Information Center (GARD): Sacrococcygeal Teratoma overview.
- Orphanet: Rare tumor database and classifications.
- OMIM (Online Mendelian Inheritance in Man): Germ cell tumor data.
- Journal of Pediatric Surgery: Clinical guidelines on the management of sacrococcygeal tumors.
