case_images: PMC7749965_01
case_images: (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.
case_images: SNI-11-410-g001.jpg
case_images: PMC7749965_01_SNI-11-410-g001.jpg
case_images: F1
case_images: Patent bilateral codominant lateral venous sinuses were noted on preoperative imaging [Figure 1].
case_images: (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.
case_images: SNI-11-410-g002.jpg
case_images: PMC7749965_01_SNI-11-410-g002.jpg
case_images: F2
case_images: Postoperative contrasted MRI again revealed patent venous sinuses [Figure 2].
case_images: (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).
case_images: SNI-11-410-g003.jpg
case_images: PMC7749965_01_SNI-11-410-g003.jpg
case_images: F3
case_images: 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].
case_images: Magnetic resonance venogram demonstrating recanalization of the superior sagittal sinus (arrow) and partial recanalization of the right transverse and sigmoid sinuses (arrowheads).
case_images: SNI-11-410-g004.jpg
case_images: PMC7749965_01_SNI-11-410-g004.jpg
case_images: F4
case_images: TS. The patient remained asymptomatic at 6 months follow-up [Figure 4].