Artefacts at a glance: differentiating features of artefactual stenosis from true stenosis at the genu of the petrous internal carotid artery on TOF MRA

•TOF MRA is increasingly used for the noninvasive evaluation for imaging the cerebrovascular system.•We investigated several artifacts at the genu of petrous ICA on TOF MRA to prevent misinterpretations as true stenosis.•Short segmental, ill-defined, less dark defect at the epicenter of genu without tandem stenosis is more likely an artifact.