Cerebral MR Venography: Normal Anatomy and Potential Diagnostic Pitfalls
R. H. Ayanzena,
C. R. Bird
,a,
P. J. Kellera,
F. J. McCullya,
M. R. Theobalda and
J. E. Heisermana
a From the Department of MRI Research, Barrow Neurological Institute, Phoenix, AZ.
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FIG 1. A–C, Transverse sinuses were found to be right (A), left (B), and codominant (C) in 59%, 25%, and 16% of the cases examined, respectively.
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FIG 2. A and B, Length of flow gap is approximately one third (A, arrow) or two thirds (B, arrow) the size of the ipsilateral sinus
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FIG 3. A and B, The superior sagittal sinus (straight arrow), straight sinus (arrowhead), and vein of Galen (curved arrow) are clearly depicted, and were seen in all 100 cases studied, without flow gaps.
C and D, The right vein of Labbe (C, arrow) was seen in 91% of the cases. The right vein of Trolard (D, arrow), depicted as a large tributary to the superior sagittal sinus, was seen in only 37% of the cases.
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FIG 4. A and B, Venous phase of a conventional intra-arterial catheter angiogram clearly shows flow within the nondominant transverse sinus (A, arrow), whereas corresponding MR venogram (B) shows a flow gap
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AJNR - American Journal of Neuroradiology