MRI prenatal diagnosis for vasa previa when inconclusive
ultrasonography results come, cons and pros?
[Abstract] Objective To explore MRI assistance in
diagnosing of vasa previa when ultrasonography is inconclusive.Design Apply MRI to identify vasa previa in cases that
ultrasonography is inconclusive, and establish control group for
comparison. Setting Vasa previa results in poor outcomes if not
diagnosed prenatally, and ultrasonography usually can detect it, yet is
inconclusive occasionally. Very few papers discussed advantages of MRI
diagnosis on vasa previa. Sample From January 2018 to December
2021, 12 patients with suspected vasa previa but inconclusive
ultrasonography diagnoses were enrolled into the study group. 51
patients diagnosed by ultrasonography as mild ventriculomegaly without
vasa previa were enrolled into the control group. Methods Both
groups took MRI scanning during the 3rd trimester to check the existence
of vasa previa. Placentas from both groups were checked to confirm
existences of vasa previa immediately at delivery, and postoperatively
by pathology. Main Outcome Measures The vasa previa existences,
types, positions and directions were checked in MRI. Results In
the 12 patients from the study group, MRI demonstrated vasa previa in 11
patients. The rest one was excluded of vasa previa by MRI. In all the 51
patients from the control group, MRI had excluded vasa previa. Pathology
examination after delivery had confirmed these MRI diagnoses.Conclusions When ultrasonography is inconclusive on vasa
previa, MRI can offer some assistance in diagnosis. FundingMedical and Health Research Project of Zhejiang Province(2019ZH008).
[Key words] Vasa previa, Magnetic resonance imaging(MRI),
Inconclusive ultrasonography, Parachute type of placenta, Mangrove
placental vessels, Type Ⅲ vasa previa