- 1 in 1,000,000 births.
- Teratomas are the most common brain tumors.
- Irregular solid mass, with cystic and/or calcified components, distorting the brain anatomy.
- The incidence of chromosomal abnormalities and genetic syndromes is not increased.
- Detailed ultrasound examination, including neurosonography.
- Ultrasound scans every 4 weeks to monitor the size of the tumor: brain teratoma presents rapidly growing, and may be associated with progressive hydrocephalus and polyhydramnios.
- Place: hospital with neonatal intensive care and pediatric neurosurgery.
- Time: 38 weeks.
- Method: cesarean section if the fetal head circumference is >40 cm.
- Survival rate: <10%.
- No increased risk of recurrence.