Prenatal MR imaging of Dandy-Walker complex: midline sagittal area analysis

Area of Science:

• Neuroimaging
• Fetal Development
• Cerebellar Anatomy

Background:

• Dandy-Walker (DW) complex encompasses a spectrum of congenital brain malformations.
• Accurate measurement of cerebellar structures is crucial for diagnosing DW spectrum disorders.
• Understanding variations in vermis area (VA) and posterior fossa area (PFA) can aid in differential diagnosis.

Purpose of the Study:

• To quantify and compare mid-sagittal vermis area (VA) and posterior fossa area (PFA) in fetuses with Dandy-Walker (DW) entities.
• To identify differences in VA and PFA among fetuses diagnosed with hypoplastic vermis (HV), HV with rotation (HVR), mega cistern magna (MCM), and controls.

Main Methods:

• Retrospective review of fetal MRI data from 25 DW spectrum cases (HV, HVR, MCM) and 85 controls.
• Manual tracing of mid-sagittal vermis area (VA) and posterior fossa area (PFA) on MRI scans.
• Statistical analysis of age-corrected VA and PFA to determine group differences.

Main Results:

• Mean vermis area (VA) was significantly smaller in fetuses with HVR and HV compared to controls and MCM.
• Mean posterior fossa area (PFA) was significantly larger in fetuses with MCM, HVR, and HV compared to controls.
• MCM fetuses had a larger mean VA than HVR and HV fetuses, but smaller than controls.

Conclusions:

• Fetuses with HVR or HV demonstrate reduced vermis areas, while MCM, HVR, and HV fetuses present with enlarged posterior fossas compared to controls.
• These findings contribute to differentiating DW spectrum entities based on quantitative volumetric analysis.
• Further research can clarify posterior fossa anomalies and improve diagnostic accuracy for Dandy-Walker complex.