Prevalence:

• 1 in 1,000,000 births.
• Teratomas are the most common brain tumors.

Ultrasound diagnosis:

• Irregular solid mass, with cystic and/or calcified components, distorting the brain anatomy.

Associated abnormalities:

• The incidence of chromosomal abnormalities and genetic syndromes is not increased.

Investigations:

• Detailed ultrasound examination, including neurosonography.

Follow up:

• 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.

Delivery:

• Place: hospital with neonatal intensive care and pediatric neurosurgery.
• Time: 38 weeks.
• Method: cesarean section if the fetal head circumference is >40 cm.

Prognosis:

• Survival rate: <10%.

Recurrence:

• No increased risk of recurrence.