Fetal Sacrococcygeal Teratoma: A Case Report of a Giant Tumor with an Excellent Outcome

Abstract

Sacrococcygeal teratoma (SCT) occurs in approximately 1 per 20,000–40,000 births and is the most frequently encountered fetal teratoma, with 75% of cases observed in female fetuses. SCT can be detected on ultrasound as early as the first trimester, presenting as a large mass originating from the sacrococcygeal area, with or without an intrapelvic component. The prenatal course for most fetuses with SCT is generally uneventful, with only a few cases experiencing obstetric and fetal complications. We present the case of a 19-year-old woman who was in good health and had no relevant family or medical history. She was gravida 2 and para 1. During the first trimester scan, an examination revealed a heterogeneous mass in the presacral area with a predominantly multicystic appearance, measuring 12 mm in diameter. At 21+6 weeks of gestation, the Type 2 fetal SCT showed an increase in volume with the size of 49×37×36 mm and contiune to increase in size. The male fetus was deliv-ered by elective Cesarean section at 38 weeks of gestation. The resection of the tumor and coccyx was performed when the newborn was 7 days old. The tumor measured 190×160×100 mm and weighed 1100 g. Pathological examination confirmed the diagnosis of a mature teratoma (Grade 0), and the resection margins were negative. Our case report highlights a fetus with a large and rapidly growing SCT, yet the outcome was excellent.