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Table 3: Intermodality discrepancy in residual/recurrent dural arteriovenous fistula detection and classification^{^a}
Location Pretreatment Grading 4D-MRA/DSA Interval (Days) DSA Grading 4D-MRA Consensus Grading 4D-MRA Reader Disagreement (Yes/No) Year 4D-MRA Consensus Quality Score Possible Explanation
Parasagittal right III 65 IV 0 No 2010 3 Confusion between occipital artery and a cortical vein
Cavernous sinus right III 59 III 0 No 2015 2 Cortical vein visible but missed by 4D-MRA readers
Transverse sinus left IIb 112 I 0 No 2017 2 Artery and vein overlay
SSS IIb 129 0 IIa + b No 2012 3 Early drainage due to a meningioma
Cavernous sinus left III 0 III 0 No 2015 3 Cortical vein visible but missed by 4D-MRA readers
Posterior fossa right IV 43 III 0 No 2009 3 Early opacification of all dural sinuses; shunt missed due to misinterpretation of time sequence in 4D-MRA
Sigmoid sinus left III 2 IIa 0 No 2011 2 Cortical vein visible but missed by 4D-MRA readers
Medulla V 3 V 0 Yes (III/0) 2011 3 Not visible in the FOV
Parieto-occipital left III 85 III 0 No 2018 2 Cortical vein visible but missed by 4D-MRA readers
Note:—SSS indicates superior sagittal sinus.
↵a Grading according to Cognard et al.⁵