PMC10316143_01
Brain computed tomography brain without contrast: (a and b) well-defined hypodense lesion seen at the foramen of Monroe with a hyperdense area in the dependent portion (arrowhead in image a and brackets in image b), most likely representing a colloid cyst. Two linear intraventricular hyperdensities represent bilateral external ventricular drainage shunt insertion (arrows).
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F1
As shown in Figures 1 and 2, brain CT and magnetic resonance imaging (MRI) revealed a third ventricle CC with dilated ventricles.
Brain MRI with contrast. Axial FLAIR (fluid attenuated inversion recovery). Image a and b Legend: A well-defined predominantly cystic lesion (arrow) measuring approximately 19 mm in diameter at the foramen of Monroe. The hypointense area within the cystic lesion corresponds to hyperdensity at the dependent portion on the prior CT scan (arrowhead). The lesion causes anterior displacement of the forniceal pillars and lateral deviation of the posterior part of both frontal horns of lateral ventricles. No significant suppression relative to CSF was observed in the FLAIR images. Brain MRI, axial 3D with contrast. Image c and d Legend: No significant enhancement is observed in the lesion after contrast administration (asterisk) or in the isointense area within the cystic lesion (curved white arrow).
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F2
As shown in Figures 1 and 2, brain CT and magnetic resonance imaging (MRI) revealed a third ventricle CC with dilated ventricles.
Pathology slide picture. (a) The colloid content of the cyst (x20). (b) The fibrovascular wall of the cyst (x4). (c) The lining of the cyst is attenuated and inflamed (x20).
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F3
Brain computed tomography (CT) venography. (a-d) CT venography shows an extensive filling defect at the level of the anterior and posterior superior sagittal sinus (arrowheads in a), right transverse sinus (arrowheads in b), right sigmoid sinus (arrowhead in c), and right internal jugular vein with peripheral calcification (arrowhead in d). (e) Sagittal CT venogram shows an extensive filling defect of the superior sagittal sinus (arrowheads in e).
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F4
However, as shown in Figure 4, brain CT venography confirmed extensive thrombosis of the superior and inferior sagittal sinuses, right sigmoid sinus, and right internal jugular vein.