This is a 34-year-old patient, gravida 3 para 2, with no known family history of teratoma or germ cell tumors, with a history of two cesarean sections, admitted at 22 weeks of amenorrhea for the investigation of pelvic pain. A morphological ultrasound was conducted, revealing a sacrococcygeal mass that raised the possibility of a sacrococcygeal teratoma, myelomeningocele, or meningocele.

The morphological ultrasound examination identified a mass attached to the coccyx, characterized by a lobulated appearance and a mixed echostructure. The mass predominantly consisted of a liquid component alongside a tissue component with vascularization seen on Doppler imaging and was associated with a 10 cm cystic formation. There was no evidence of fetal hydrops or cardiac insufficiency. The Doppler ultrasound revealed moderate vascularization, which contributed to the assessment of hemodynamic risk and the monitoring of tumor progression. ( Figure 1 ; Figure 2 )

A cesarean section was conducted at 34 weeks of gestation due to a significant risk of premature labor. A female newborn weighing 2200 grams, with an Apgar score of 7/10, was delivered. The neonatal examination confirmed the presence of a large sacrococcygeal mass. Surgical intervention performed on the second day of life involved a complete excision of the teratoma along with the removal of the coccyx to reduce the risk of recurrence. The procedure lasted two hours and required close postoperative monitoring due to the risk of hemorrhage and infection. Histological analysis confirmed the mature nature of the teratoma, with no signs of malignancy. ( Figures 3 )

This case aligns with existing literature that indicates a higher incidence of sacrococcygeal teratoma in females [1] [2] . Although maternal age was not specified, some studies have noted a higher prevalence in mothers over the age of 30 [7] .

The diagnosis was established at 22 weeks of amenorrhea, which aligns with the standard detection period of 18 to 24 weeks of amenorrhea [8] . The mass was 10 cm in size, though there have been reports of masses reaching up to 25 cm [9] . The absence of fetal complications, particularly hydrops fetalis, serves as a positive prognostic indicator. However, the ultrasound criteria for distinguishing benign forms from potentially aggressive ones remain a topic of debate in the literature.

Performing a cesarean section at 34 weeks of amenorrhea complies with the guidelines for managing large teratomas (>5 cm), which helps to minimize obstetric complications. The newborn’s weight of 2200 g is within the typical range of 2000 to 3500 g [5] .

Performing surgery on the second day of life aligns with guidelines designed to mitigate the risks of hemorrhage and malignant degeneration. Our case highlights the importance of a multidisciplinary approach involving obstetricians, neonatologists, and pediatric surgeons in order to optimize the prognosis. Neonatal survival rates have improved due to advancements in imaging and surgery, with current postnatal mortality around 15%, compared to 35% - 60% during the antenatal period [7] .