Evaluation of sigmoid sinus hemodynamics through four-dimensional flow magnetic resonance imaging in pulsatile tinnitus patients caused by sigmoid sinus wall dehiscence coexisting with idiopathic intracranial hypertension

4D flow MRI provides hemodynamic detail in a specific pulsatile tinnitus subtype (sigmoid sinus wall dehiscence plus idiopathic intracranial hypertension) that may aid surgical planning, but the study design limits generalizability — no immediate protocol change for most clinics.