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Fetal MRI for Brain Anomalies

High-resolution fetal magnetic resonance imaging performed after 20-22 weeks gestation to evaluate central nervous system anomalies suspected on prenatal ultrasound.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Radyoloji department. Book Appointment →

What is Fetal MRI for Brain Anomalies?

Fetal MRI is a non-invasive imaging modality that complements prenatal ultrasound for detailed evaluation of fetal anatomy, particularly the central nervous system, after 20-22 weeks of gestation when sufficient brain development allows reliable assessment.

Examination uses 1.5T or 3T magnets with ultrafast single-shot T2-weighted, T1-weighted, diffusion-weighted, and SWI sequences. No intravenous contrast (gadolinium contraindicated) or maternal sedation is required in most cases.

Common indications include ventriculomegaly, agenesis or hypoplasia of the corpus callosum, posterior fossa anomalies (Dandy-Walker, Joubert), cortical malformations, suspected destructive lesions (infection, hemorrhage, ischemia), and complex twin pregnancies (TTTS, monochorionic anomalies).

Symptoms

Ventriculomegaly on prenatal ultrasound (>10 mm atrial width)
Suspected agenesis or hypoplasia of the corpus callosum
Posterior fossa anomalies (Dandy-Walker complex, Blake's pouch, Chiari II)
Cortical malformations (lissencephaly, polymicrogyria, schizencephaly)
Intracranial hemorrhage or destructive lesions
Tumors or vascular malformations (vein of Galen)
Twin-to-twin transfusion syndrome (TTTS) sequelae

Risk Factors

Maternal infection (CMV, toxoplasmosis, Zika)
Family history of CNS malformation or genetic syndrome
Twin pregnancy with suspected complications
Maternal trauma or hemorrhage
Suspected fetal neoplasm or vascular malformation
Inconclusive prenatal ultrasound findings
Genetic counseling requiring detailed imaging

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Abnormal prenatal ultrasound findings requiring further evaluation
  • Family history of CNS malformation or syndromic disorder
  • Maternal infection with potential fetal CNS effects
  • Genetic counseling and termination decision-making support
  • Multidisciplinary fetal medicine consultation
  • Pre-delivery planning for postnatal care
  • Counseling about prognosis and outcomes

Treatment Methods

01
Pre-MRI counseling and informed consent
02
Maternal positioning (left lateral) and bladder emptying
03
Single-shot T2 (HASTE/SSFSE) sequences in three planes
04
T1, diffusion-weighted, and SWI sequences as needed
05
No intravenous contrast or maternal sedation in most cases
06
Pediatric neuroradiologist interpretation
07
Multidisciplinary team review (fetal medicine, neonatology, neurosurgery)

Which Department to Visit?

You can visit our Radyoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.