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Anomalous Intracranial Venous Drainage Associated with Basal Ganglia Calcification

Z. Chena, H. Fenga, G. Zhua, N. Wua and J. Lina

a From the Department of Neurosurgery, Southwest Hospital, Third Military Medical University, Chongqing, China


Figure 1
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  		Fig 1. CT scan of the patient.

A, Noncontrast axial CT scan shows subcutaneous mass (arrow) and local skull defect on the upper portion of the petrous bone.

B, Contrast axial CT scan shows that the enhanced subcutaneous mass (arrow) is communicated with the lateral sinus (arrowheads) through the skull defect, which suggests that the mass lesion is dilated scalp veins filled through the prominent mastoid emissary foramen.

C, 3D CT-shaded surface display showing enlargement of the outer opening of the mastoid emissary foramen (arrow) and depression of the skull surface (arrowheads) around it.


Figure 2
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  		Fig 2. Noncontrast axial CT scan shows diffuse calcification on the bilateral basal ganglia and subcortical white matter.


Figure 3
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  		Fig 3. Digital subtraction angiogram.

A and B, Venous phase of left internal carotid artery angiogram in lateral view (A) and anterioposterior view (B) demonstrate nonopacification of right transverse sinus and left sigmoid sinus. There are tortuous collateral scalp veins via the enlarged mastoid emissary vein.

C, Late venous phase of internal carotid artery angiogram in lateral view with manual compressing of the outer opening of the mastoid emissary foramen shows marked narrowing of left transverse sinus and atresia of bilateral sigmoid sinus (arrow) and occipital sinus (arrowheads), suggesting the venous drainage of intracanial structures are mainly throught the mastoid emissary vein.





Copyright © 2008 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X