Parental or Trio Magnetic Resonance Imaging to Improve Prenatal Counseling in Brain Anomalies.

Objective: To assess whether targeted magnetic resonance of one or both of the progenitors could refine the diagnosis in cases of fetal brain anomalies with uncertain prognosis.

Methods: Single-center retrospective case series, where targeted magnetic resonance was performed on one or both of progenitors after a suspicion of fetal complex brain anomalies, and prognosis was unclear based solely on fetal tests (neurosonogram, fetal magnetic resonance, and genetic testing).

Results: Seven women were included. Results were relevant for prenatal counseling in five cases, with a definitive diagnosis in three: one periventricular nodular heterotopia, one mild tubulinopathy, and one dynein-associated neurodevelopmental disorder. Median gestational age at referral was 28.3 weeks (range, 20.7-34.9). Neurosonogram findings were inconclusive in all cases. Exome sequencing in amniotic fluid was conducted for all cases. Fetal magnetic resonance was performed at a median gestational age of 34.4 weeks (range, 29.3-35.7), confirming ultrasound diagnosis in all cases, and providing substantial additional information in two (2/7, 28.6%). Parental magnetic resonance findings aligned with fetal findings in 5/7 cases (71.4%).

Conclusion: DUO or TRIO magnetic resonance, involving both progenitors and the fetus, could play a significant role in prenatal diagnosis of selected brain anomalies with uncertain prognosis.