To assess the clinical application of prenatal ultrasound and magnetic resonance imaging (MRI) in fetal dural sinus malformation (DSM).

A series of 8 fetuses with DSM diagnosed by prenatal ultrasound and MRI at Hubei Maternal and Children's Hospital from September 2014 to May 2022 were included. The fetal imaging data were retrospectively analyzed to summarize the characteristic prenatal ultrasound and MRI manifestations of DSM. The clinical outcomes of the fetuses were followed.

(1) The torcular herophili was involved in 7 cases, and the right transverse sinus and sigmoid sinus were affected in 1 case. (2) The locations of venous sinus thrombosis included the thetorcular herophili in 7 cases, and the right transverse sinus and sigmoid sinus in 1. (3) Regarding intracranial abnormalities combined, 2 cases had cerebellomedullary cistern enlargement, 2 had lateral cerebral ventricular enlargement, and 1 had white matter oedema in the left frontal lobe, bleeding in the left frontal lobe, and subarachnoid hematoma. (4) No combined extracranial and systemic abnormalities occurred. (5) Of the 8 cases included, 7 underwent induced labor (2 cases were confirmed to have dura mater sinus malformation with venous sinus thrombosis by autopsy, 1 was confirmed to have craniocerebral structure destruction after craniotomy, and 4 did not undergo autopsy), and 1 was born (telephone follow-up to 7 months after the delivery found no neurological sequelae).

Prenatal ultrasound can be the preferred method for screening fetal DSM, while MRI can be the main diagnostic method. The combination of prenatal ultrasound and MRI can accurately and comprehensively evaluate fetal DSM, which is helpful for prenatal clinical decision-making and fetal prognosis evaluation.