METHOD OF LOCATING NEUROVASCULAR CONFLICT OF VESTIBULOCOCHLEAR NERVE IN POSTERIOR CRANIAL FOSSA

摘要

FIELD: medicine.;SUBSTANCE: invention relates to medicine, otorhinolaryngology and magnetic resonance imaging (MRI). MRI in modes T2 Drive (Fiesta) and B_TFE and 3D-phase contrast angiography (3D PCA) are made at flow rate of measurement 35 cm/s. Identical section geometry is used for all examinations, as well as thickness and pitch of cut. Plane is also the same at all investigations and it exposed at anatomical points: Chamberlain line in sagittal plane and centers of cochleas in coronary plane. Aggregate image in one plane is obtained by applying on each other images obtained at said studies, visualized on total image of vestibulocochlear nerve and anterior inferior cerebellar artery. Wherein nerve display is identified by hypointensive signal - black color, artery - hyperintensive signal - white color. Then one performs measurement of linear distances of intersection of vessel with nerve relative to reference point on lateral surface of brainstem - at outlet of vestibulocochlear nerve at lateral surface of brainstem. If nerves and vessels do not intersect, norm is stated. In case of presence of contact point of artery and nerve compression is diagnosed, localisation of which is determined by distance from control point, which is located on lateral surface of brainstem at outlet of vestibulocochlear nerve at lateral surface of brainstem.;EFFECT: method provides high accuracy, minuteness of non-invasive diagnosis in patients with cochlear and vestibular disorders by determining accurate ratio of point of conflict with anatomical feature of passage of vestibular and cochlear nerve parts, which enables to make conclusion on influence on clinical picture of zone of conflict.;1 cl, 1 ex