Objective: To assess the value of three-dimensional volume contrast imaging C (VCI-C) combined with magnetic resonance imaging (MRI) in the diagnosis of fetal posterior cranial cavity disease.

Methods: This study retrospectively analyzed the imaging data of 100 pregnant women with diagnosed abnormal development of fetal cerebellar vermis or posterior cranial fossa in our hospital from January 2020 to February 2022. VCI-C combined with MRI was used to evaluate the morphology of fetal cerebellar vermis, and the display of primary fissures and secondary fissures. The angle between the brain stem and cerebellar vermis (BVA) and the angle between brain stem and cerebellar tentorium (BTA) were measured and compared through MRI images.

Results: There was no significant difference between VCI-C and MRI in measuring the height, anteroposterior diameter, or area, BVA and BTA of fetal cerebellar vermis in the normal control group (P > 0.05). It can be considered that the two imaging methods are consistent in measuring the height, anteroposterior diameter and area, BVA, and BTA of the fetal cerebellar vermis in the normal control group. There was no significant difference between VCI-C and MRI in measuring the height, anterior posterior diameter and area, BVA, or BTA of the vermis in the group of fetal cerebellar vermis dysplasia (P > 0.05). The two imaging methods were comparable for all these measurements.

Conclusion: Combining three-dimensional VCI-Cwith MRI diagnosis, the median sagittal section of the cerebellar vermis can be observed, the morphologic structure of the vermis, and the anatomical structure of the posterior cranial fossa can be reflected stereoscopically. Quantitative indexes can be measured and calculated to evaluate the developmental abnormalities of the fetal cerebellar vermis and the lesions of the posterior cranial fossa. Their combined effect is better than that of a single application.

Keywords: MRI; Three-dimensional VCI-C; diagnosis; fetal posterior cranial cavity disease.

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