EP07.66: Prenatal ultrasound diagnosis of fetal sacrococcygeal teratoma: a case report

Sacrococcygeal teratoma is recognised as the most common and benign fetal tumour. However, tumours displaying predominantly solid composition and heightened vascularity present an increased risk of fatal outcomes. Hydrops and tumour hemorrhage are particularly associated with elevated fetal mortality rates. The management of sacrococcygeal teratomas typically entails employing ultrasound scans with Doppler, while magnetic resonance imaging (MRI) is commonly utilised to assess intrapelvic extension and the tumour's relationship with adjacent structures. Ms. A.R., a 24-year-old primigravida, was referred to our Level III maternity ward for investigation of a placental tumour in a pregnancy estimated at 24 weeks of gestation. Ultrasound examination revealed a Type I sacrococcygeal teratoma measuring 110*90 mm, without evidence of anemia on Doppler or fetal hydrops. Faced with the development of polyhydramnios and cardiomegaly, a decision was made to proceed with Caesarean section at 37 weeks. A planned Caesarean delivery resulted in the birth of a male newborn weighing 3600g. Regrettably, he was transferred to the neonatal unit, where he succumbed at 12 hours of age. Pathological examination confirmed the diagnosis of sacrococcygeal teratoma. In conclusion, this case report provides valuable insights into prenatal diagnosis and counselling of sacrococcygeal teratoma.