MRA Head and Neck Without IV Contrast There is no relevant literature regarding the use of MRA head and neck without IV contrast in the evaluation of isolated AVS. MRI Cervical and Thoracic Spine With IV Contrast There is no relevant literature regarding the use of MRI cervical and thoracic spine with IV contrast in the evaluation of isolated AVS. Dizziness and Ataxia MRI Cervical and Thoracic Spine Without and With IV Contrast There is no relevant literature regarding the use of MRI cervical and thoracic spine without and with IV contrast in the evaluation of isolated AVS. MRI Cervical and Thoracic Spine Without IV Contrast There is no relevant literature regarding the use of MRI cervical and thoracic spine without IV contrast in the evaluation of isolated AVS. MRI Head and Internal Auditory Canal With IV Contrast There is no relevant literature regarding the use of MRI head and IAC with IV contrast in the evaluation of isolated AVS. MRI Head and Internal Auditory Canal Without and With IV Contrast Imaging evaluation in isolated AVS without features of central vertigo is unnecessary. Routine MRI of the head in the setting of vestibular neuritis, the most common cause of isolated AVS, is characteristically normal. Dedicated imaging of the IACs allows for improved evaluation of the vestibular nerve and may show a decreased caliber of the nerve following vestibular neuritis; however, this is not always present and is not required to establish the diagnosis [34,35]. Detection of vestibular nerve enhancement following the IV administration of gadolinium- containing contrast would also support the clinical diagnosis of vestibular neuritis [36]. Labyrinthitis, another common cause of AVS, may also have findings on contrast-enhanced MRI of the IACs; however, this is often diagnosed clinically due to the presence of associated hearing loss or tinnitus and will be discussed separately (Variant 4) [1].
Dizziness and Ataxia. MRA Head and Neck Without IV Contrast There is no relevant literature regarding the use of MRA head and neck without IV contrast in the evaluation of isolated AVS. MRI Cervical and Thoracic Spine With IV Contrast There is no relevant literature regarding the use of MRI cervical and thoracic spine with IV contrast in the evaluation of isolated AVS. Dizziness and Ataxia MRI Cervical and Thoracic Spine Without and With IV Contrast There is no relevant literature regarding the use of MRI cervical and thoracic spine without and with IV contrast in the evaluation of isolated AVS. MRI Cervical and Thoracic Spine Without IV Contrast There is no relevant literature regarding the use of MRI cervical and thoracic spine without IV contrast in the evaluation of isolated AVS. MRI Head and Internal Auditory Canal With IV Contrast There is no relevant literature regarding the use of MRI head and IAC with IV contrast in the evaluation of isolated AVS. MRI Head and Internal Auditory Canal Without and With IV Contrast Imaging evaluation in isolated AVS without features of central vertigo is unnecessary. Routine MRI of the head in the setting of vestibular neuritis, the most common cause of isolated AVS, is characteristically normal. Dedicated imaging of the IACs allows for improved evaluation of the vestibular nerve and may show a decreased caliber of the nerve following vestibular neuritis; however, this is not always present and is not required to establish the diagnosis [34,35]. Detection of vestibular nerve enhancement following the IV administration of gadolinium- containing contrast would also support the clinical diagnosis of vestibular neuritis [36]. Labyrinthitis, another common cause of AVS, may also have findings on contrast-enhanced MRI of the IACs; however, this is often diagnosed clinically due to the presence of associated hearing loss or tinnitus and will be discussed separately (Variant 4) [1].