FIG 3. A false-negative case on MRA maximum-intensity-projections; 57-year-old woman with diplopia and ptosis.

T2-weighted axial (A), and frontal (B) and superior (C) 3D TOF MRA maximum-intensity-projections show no evidence of dural arteriovenous fistula. Only MRA source image (D) reveals the fistula with flow-related enhancement of the right cavernous sinus (white arrowheads). The cavernous and inferior petrosal sinuses (black arrows) are demonstrated with slowly shunted, faint contrast filling on lateral projections of internal and external carotid angiographies (E and F).