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Fig 2. A, Axial T2 shows loss of the normal flow void in the right transverse sinus (arrows). B, Coronal view of MIP from 2D TOF MRV shows loss of signal intensity in the right and left transverse sinuses. C, Sagittal view of MIP from 2D TOF MRV shows loss of signal intensity in the posterior aspect of superior sagittal sinus (arrow), which is clearly demonstrated despite image degradation by motion. The appearance is suspicious of artifactual flow gap in the transverse sinuses and superior sagittal sinus caused by in-plane saturation, possibly exacerbated by skull molding. Coronal (D) and sagittal (E) reformatted images of CTV show that the transverse and superior sagittal sinuses are patent. This confirms that the flow gaps seen in the venous sinuses on TOF MRV are artifactual. There is, however, persistent narrowing of the superior sagittal sinus in the region where the lambdoid sutures converge (arrowhead), which suggests that skull molding may play a role in narrowing the caliber of the superior sagittal sinus, thereby increasing the likelihood of demonstrating flow gaps in the superior sagittal sinus on 2D TOF MRV in neonates.
