Download combined checklist/report template for ct of the

RC CN VIII symptoms
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Imaging Findings
Contrast enhancement of the labyrinth or vestibular nerves
None or nonspecific scattered FLAIR/T2 hyperintensities.
Absence of bone overlying the superior semicircular canal
Opacified mastoid air cells; fluid in the middle ear.
See MacDonald criteria for diagnosis.
TIA: none. Stroke: MRI (+) DWI acutely, followed by (+) T2, FLAIR and
then (much later) (+) T1
Controversial; asymmetry of vestibular aqueduct.
Mass at the cerebellopontine angle or, more rarely, within the internal auditory
canal. With longstanding tumors, there may be erosion/widening of the canal.
Intra-axial or extra-axial brainstem mass.
Abnormal contrast enhancement of the meninges, with or without nodularity.
“RC CN VIII symptoms 01-01-01”, available at www.foxvalleyradiology.com
Cause
Vestibular neuritis
Migrainous vertigo
Semicircular canal
dehiscence
Otitis media
Multiple sclerosis
Vertebrobasilar
distribution ischemia
Meniere disease
Vestibular schwannoma
Brainstem tumor
Meningitis
RC CN VIII symptoms
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COMBINED CHECKLIST/REPORT TEMPLATE FOR MRI DONE FOR
CN VIII SYMPTOMS
MRI BRAIN UNENHANCED [<AND CONTRAST ENHANCED>]
INDICATION: []
COMPARISON: [Check priors to see if following a known lesion.]
TECHNIQUE: []
INTERPRETATION:
Brain and CSF spaces: [Scattered lesions of the brain showing decreased SI on T1WI and
increased SI on T2WI (multiple myeloma, migraine headaches with vertigo, vasculopathy).
Focus of restricted diffusion in the brainstem with or without accompanying signal abnormality
on other sequences (brainstem infarct). Extra-axial posterior fossa mass along the porous
acousticus (vestibular schwannoma).]
Pituitary gland and pineal: []
Vasculature: [Flow limiting lesion (as a cause of vertebrobasilar TIA or stroke). Aneurysm or
vertebrobasilar dolichoectasia (with compression on the brainstem or CN VII/VIII complex.]
Paranasal sinuses: []
Nasal cavity and nasopharynx: []
Otomastoid findings: [Contrast enhancing lesion along the course of the CN VII/VIII complex
(vestibular schwannoma). Abnormal contrast enhancement of the labyrinth or vestibular nerves
(labryinthitis).] [Opacification of the mastoid air cells (mastoiditis). Abnormal appearance of
the cochlea (Mondini or other congenital deformity).]
Bones and joints: []
Orbits: []
IMPRESSION: []
“RC CN VIII symptoms 01-01-01”, available at www.foxvalleyradiology.com
RC CN VIII symptoms
Page 3 of 4
COMBINED CHECKLIST/REPORT TEMPLATE FOR CT OF THE
TEMPORAL BONES DONE FOR CONDUCTIVE HEARING LOSS
CT TEMPORAL BONE WITHOUT IV CONTRAST
CLINICAL INFORMATION: []
COMPARISON STUDIES: [Check priors to see if following a known lesion.]
TECHNIQUE: []
INTERPRETATION:
External auditory canals: [Soft tissue density (cerumen or inflammation) or other material
(foreign body).]
Ossicles/middle ear: [Abnormal ossicles (congenital deformity or absence)+] [Mass or
destruction (cholesteatoma, glomus tumor). Fluid density filling the middle ear or bone
destruction (middle ear effusion, otitis media).]
Cochlea: [Abnormal number of turns or dilated vestibule (congenital deformity).]
Semicircular canals: [Destruction (otitis media, cholesteatoma).]
Internal auditory canal: [Mass or expansion (acoustic schwannoma, other tumors).]
Mastoid air cells: [Opacity (mastoiditis/otitis media). Mass (cholesteatoma, squamous cell
carcinoma, glomus tumor).]
Other structures: [Skin thickening or inflammation (infection extending into external auditory
canal).]
IMPRESSION: []
“RC CN VIII symptoms 01-01-01”, available at www.foxvalleyradiology.com
RC CN VIII symptoms
Page 4 of 4
Hearing loss frequent causes
Isolated conductive hearing loss: cholesteatoma, congenital anomaly of the cochlea, chronic
otitis media, middle ear effusion, glomus tumor, external auditory canal cerumen, foreign body,
or infection. For sensorineural or combined hearing loss, see “Cranial nerve 8 symptoms
frequent causes”.
Hearing loss error prevention
Isolated conductive hearing loss: Subtle hematoma, middle ear effusion, cochlear anomaly, and
glomus tumor. For sensorineural or combined hearing loss, see “Cranial nerve 8 symptoms
frequent causes”.
Cranial nerve 8 frequent causes
Vestibular neuritis, brainstem stroke or TIA, vestibular schwannoma, multiple sclerosis,
brainstem tumor, Meniere disease, migrainous vertigo, vestibular neuritis, otitis media,
meningitis and semicircular canal dehiscence.
Cranial nerve 8 prevention
Vestibular neuritis, brainstem stroke or TIA, vestibular schwannoma, multiple sclerosis,
brainstem tumor, Meniere disease, migrainous vertigo, vestibular neuritis, otitis media,
meningitis and semicircular canal dehiscence.
“RC CN VIII symptoms 01-01-01”, available at www.foxvalleyradiology.com