← All decks
ENT
Temporal Bone Imaging
Built from Haynes-Glasscock-Shambaugh Surgery of the Ear, Seventh Edition
What’s inside
11 sections · 149 slides
Overview
- Scope of temporal bone imaging
Imaging modalities
- Physical basis of computed tomography
- Hounsfield units and image reconstruction
- Helical acquisition and scan time
- Clinical indications for CT
- Intravenous contrast in CT
- Physical basis of magnetic resonance imaging
- T1-weighted signal characteristics
- T2-weighted signal characteristics
- Gadolinium enhancement and fat suppression
- Gadolinium safety and renal function
- Clinical indications for MRI
- Temporal bone MRI protocol
- Angiography, MRA and CTA
- Nuclear imaging in temporal bone disease
- Modality selection by presenting problem
Anatomic variations
- Anatomic variation as a diagnostic pitfall
- Variability of mastoid pneumatization
- Variable mastoid pneumatization on axial CT
- Marrow signal in the non-pneumatized temporal bone
- Tegmen anatomy and the low-hanging tegmen
- Down-sloping lateral tegmen in congenital aural atresia
- Petrous apex pneumatization variants
- Variation of the jugular fossa and bulb
- Consequences of a dehiscent jugular bulb
- High-riding dehiscent jugular bulb in the mesotympanum
- High-riding jugular bulb versus glomus tumour on MRI
- Aberrant internal carotid artery
- Aberrant internal carotid artery crossing the middle ear
- Distinguishing aberrant carotid from glomus tympanicum
- Arachnoid granulations of the temporal bone
- Complications of eroding arachnoid granulations
Inflammatory and infectious disease
- Acute otomastoiditis: imaging findings
- Progression of acute otomastoiditis
- Coalescent mastoiditis with subperiosteal abscess
- Intracranial complications of otomastoiditis
- Intraparenchymal abscess complicating acute otomastoiditis
- Role of imaging in chronic otomastoiditis
- Two forms of chronic otomastoiditis
- Chronic otomastoiditis without cholesteatoma
- Contracted sclerotic mastoid and epitympanic cholesteatoma
- Cholesteatoma: CT features
- Labyrinthine fistula from cholesteatoma
- Cholesteatoma with ossicular erosion and lateral canal dehiscence
- Limitations of CT in cholesteatoma
- Diffusion-weighted MRI for residual cholesteatoma
- Restricted diffusion of cholesteatoma on DWI
- Skull base osteomyelitis: clinical features
- Route of spread in skull base osteomyelitis
- Imaging strategy in skull base osteomyelitis
- Nonspecific skull base enhancement on MRI
- Gallium uptake in the central skull base
- Indium-tagged white cell uptake in the central skull base
Temporal bone trauma
- Indications for imaging after temporal bone trauma
- Classification of temporal bone fractures
- Longitudinal and transverse temporal bone fractures
- Assessment of ossicular injury on CT
- Traumatic incudomalleolar dislocation
- Otic capsule classification and vascular injury
- Post-traumatic labyrinthine haemorrhage
- Meningocele and meningoencephalocele
- MRI in suspected meningoencephalocele
Congenital hearing loss
- Burden and role of imaging in congenital hearing loss
- Imaging in congenital sensorineural hearing loss
- Enlarged vestibular aqueduct on axial CT
- Retrocochlear lesions in the older child
- Bilateral vestibular schwannomas in neurofibromatosis type II
- Pre-cochlear implant imaging
- Labyrinthitis ossificans and cochlear patency
- Radiation and gadolinium in children
- Imaging in congenital conductive hearing loss
- Imaging in congenital aural atresia
- Timing of imaging in aural atresia
Pulsatile tinnitus and vascular tumours
- Imaging approach to pulsatile tinnitus
- Paraganglioma imaging characteristics
- Salt-and-pepper appearance of a jugular foramen paraganglioma
- Role of angiography in glomus jugulare tumours
- Occult vascular causes of pulsatile tinnitus
- Sigmoid sinus diverticulum and dehiscence
- Sigmoid sinus diverticulum on axial CT
Facial nerve lesions
- Indications for imaging in facial paralysis
- Imaging protocol in facial nerve palsy
- Facial nerve enhancement pattern in Bell's palsy
- Facial nerve schwannoma
- Facial nerve schwannoma expanding the fallopian canal
- Facial nerve schwannoma extending into the CPA
- Facial nerve hemangioma
- Facial nerve hemangioma with intratumoral calcification
- Perineural tumour spread to the facial nerve
- Perineural spread along the descending facial nerve
- Imaging in hemifacial spasm
Retrocochlear lesions
- Evaluation of a suspected retrocochlear lesion
- Retrocochlear lesions: MRI imaging characteristics
- Vestibular schwannoma: MRI features
- Ice cream cone appearance of a vestibular schwannoma
- Intralabyrinthine and intracochlear schwannoma
- Contrasting spectrum of vestibular schwannomas
- Fast spin-echo MRI for surveillance
- Post-operative imaging after schwannoma removal
- CT when MRI is contraindicated
- CT cisternography for intracanalicular tumours
- Meningioma of the cerebellopontine angle
- Distinguishing meningioma from vestibular schwannoma
- Cerebellopontine angle meningioma with a dural tail
- Epidermoid cysts of the cerebellopontine angle
- Imaging characteristics of epidermoid cysts
- Epidermoid cyst versus arachnoid cyst on DWI
- Differentiating epidermoid from arachnoid cyst
- Lipomas of the cerebellopontine angle
- CPA and intravestibular lipoma with fat suppression
- Superficial siderosis
- Low-signal haemosiderin lining the posterior fossa
Petrous apex lesions
- Petrous apex anatomy and differential diagnosis
- Petrous apex lesions: imaging characteristics
- Cholesterol granuloma of the petrous apex
- Expansile cholesterol granuloma of the right petrous apex
- Petrous apex cholesteatoma
- Petrous apex cholesteatoma with restricted diffusion
- Petrous apex mucocele
Otosclerosis, canal dehiscence and metastasis
- Role of CT in otosclerosis
- Fenestral otosclerosis
- Fenestral otosclerosis blurring the oval window margin
- Cochlear otosclerosis
- Cochlear otosclerosis with a pericochlear halo
- CT grading of otosclerosis
- MRI in otosclerosis
- Superior semicircular canal dehiscence
- Superior semicircular canal dehiscence on coronal CT
- Imaging technique and pitfalls in SSCD
- Metastatic disease of the temporal bone
- Destructive temporal bone metastasis from renal cell carcinoma
- Modality choice by clinical question
- Key sequences and their diagnostic use
- Conclusions
- References
- References (continued)
- References (continued)
- Haynes-Glasscock-Shambaugh Surgery of the Ear, Seventh Edition
- Join our WhatsApp groups