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Figure 7c. (a, b) Lateral MR venograms show the coronal (vertical white line in a) and axial (horizontal white line in b) planes of image data acquisition used for TOF MR venography. The distal portion of the superior sagittal sinus (arrow in a), which is located in the coronal plane, is poorly depicted on coronal TOF MR venograms. The horizontal portion of the superior sagittal sinus (straight arrows in b), the junction of the vein of Galen with the straight sinus (arrowhead in b), and the portions of the transverse sinus that are located in the axial plane (curved arrow in b) are poorly depicted on axial TOF MR venograms. Poor depiction of these areas may lead to misdiagnosis of occlusion at TOF MR venography. (c) Image from contrast-enhanced MR venography provides better depiction of all the venous structures.
