PMC7749965_01
(a and b) Axial and coronal T1 postcontrast preoperative magnetic resonance imaging (MRI) before retrosigmoid craniotomy. (c and d) Axial and coronal T1 postcontrast postoperative MRI after retrosigmoid craniotomy.
SNI-11-410-g001.jpg
PMC7749965_01_SNI-11-410-g001.jpg
F1
Patent bilateral codominant lateral venous sinuses were noted on preoperative imaging [Figure 1].
(a and b) Axial and coronal T1 postcontrast preoperative magnetic resonance imaging (MRI) before translabyrinthine craniotomy. (c and d) Axial and coronal T1 postcontrast postoperative MRI after translabyrinthine craniotomy.
SNI-11-410-g002.jpg
PMC7749965_01_SNI-11-410-g002.jpg
F2
Postoperative contrasted MRI again revealed patent venous sinuses [Figure 2].
(a) Axial noncontrast computed tomography (CT) demonstrating a hyperdense right transverse sinus (arrow). (b) Coronal noncontrast CT demonstrating a hyperdense superior sagittal sinus (SSS) (arrow). (c) Coronal CT venogram demonstrating thrombosis of the SSS (arrow).
SNI-11-410-g003.jpg
PMC7749965_01_SNI-11-410-g003.jpg
F3
CT venogram confirmed the presence of thrombosis within the ipsilateral internal jugular (IJ), sigmoid sinus (SS), transverse sinus (TS), SSS, and superficial cortical veins but without associated hemorrhage [Figure 3].
Magnetic resonance venogram demonstrating recanalization of the superior sagittal sinus (arrow) and partial recanalization of the right transverse and sigmoid sinuses (arrowheads).
SNI-11-410-g004.jpg
PMC7749965_01_SNI-11-410-g004.jpg
F4
TS. The patient remained asymptomatic at 6 months follow-up [Figure 4].