When to Order Imaging for Hearing Loss and/or Vertigo: ACR Appropriateness Decoded

When to Order Imaging for Hearing Loss and/or Vertigo: ACR Appropriateness Decoded

It’s a common clinical scenario: a patient presents with new-onset vertigo, hearing loss, or both. The differential is broad, spanning from benign peripheral causes to more concerning central nervous system pathology. After the initial history and physical exam, the next step is often imaging, but the choice between Computed Tomography (CT) and Magnetic Resonance Imaging (MRI), with or without contrast, can be complex. Selecting the wrong initial study can delay diagnosis, expose the patient to unnecessary radiation, and lead to inefficient care. This guide decodes the American College of Radiology (ACR) Appropriateness Criteria for Hearing Loss and/or Vertigo, providing a clear, evidence-based framework for choosing the right imaging test for the right clinical situation.

What Does the ACR Topic on Hearing Loss and/or Vertigo Cover?

The ACR Appropriateness Criteria for Hearing Loss and/or Vertigo, developed by the Neurologic panel, provides guidance for specific clinical presentations. These guidelines are designed to evaluate nontraumatic causes of these symptoms in both adult and pediatric patients. The criteria are organized into distinct clinical variants that address the most common diagnostic questions faced by clinicians.

This topic covers the initial imaging workup for:

• Acquired conductive, sensorineural, and mixed hearing loss.
• Congenital hearing loss and preoperative assessment for cochlear implants.
• Evaluation of suspected cholesteatoma or middle ear neoplasms.
• Episodic vertigo (suggesting a peripheral cause like Meniere disease or vestibular neuritis).
• Persistent vertigo (suggesting a central cause like stroke, demyelination, or a cerebellopontine angle mass).

These guidelines do not cover hearing loss or vertigo in the setting of acute head trauma, which is addressed under separate ACR criteria. They also assume a thorough clinical evaluation has been performed to characterize the patient’s symptoms before imaging is considered.

What Imaging Should I Order for Hearing Loss and/or Vertigo? Recommendations by Clinical Scenario

The optimal imaging modality depends entirely on the suspected underlying cause, as determined by the patient’s history and clinical examination. The ACR provides specific recommendations for seven distinct scenarios.

For acquired conductive hearing loss where there is no clinically evident mass in the middle ear, the primary goal is to assess the ossicular chain and other middle ear structures. For this, a CT of the temporal bone without IV contrast is rated Usually appropriate. This high-resolution scan provides excellent detail of the bony anatomy critical for diagnosing conditions like otosclerosis or ossicular chain disruption. MRI is generally not indicated in this initial workup.

When a cholesteatoma or neoplasm is the suspected cause of conductive hearing loss and there is concern for intracranial or inner ear extension, both CT and MRI play a role in surgical planning. A CT temporal bone without IV contrast and an MRI of the head and internal auditory canal without and with IV contrast are both considered Usually appropriate. CT excels at defining bony erosion, while MRI is superior for evaluating soft-tissue extension and involvement of adjacent neural or vascular structures.

For acquired sensorineural hearing loss, the clinical question shifts to evaluating the vestibulocochlear nerve and central auditory pathways. An MRI of the head and internal auditory canal without and with IV contrast is Usually appropriate to assess for pathologies like vestibular schwannoma, demyelinating disease, or vascular loops. An MRI without contrast alone is also rated Usually appropriate. CT has a more limited role but may be appropriate in patients with contraindications to MRI.

In cases of mixed conductive and sensorineural hearing loss or for preoperative planning in a cochlear implant candidate, a comprehensive evaluation is needed. Both MRI of the head and internal auditory canal (with or without contrast) and CT of the temporal bone without IV contrast are rated Usually appropriate. CT assesses the bony anatomy for implant placement, while MRI evaluates the cochlear nerve and ensures no other pathology is present.

For vertigo, the workup depends on whether it is suspected to be peripheral or central. For episodic vertigo (peripheral vertigo), an MRI of the head and internal auditory canal (with or without contrast) is Usually appropriate to rule out retrocochlear pathology mimicking a peripheral process. For persistent vertigo (central vertigo), which raises concern for a brainstem or cerebellar cause, an MRI of the head and internal auditory canal without and with IV contrast is also Usually appropriate and is the modality of choice.

ACR Imaging Recommendations Table for Hearing Loss and/or Vertigo

Adult vs. Pediatric Hearing Loss and/or Vertigo Imaging: Radiation Dose Tradeoffs

When evaluating children for hearing loss or vertigo, minimizing exposure to ionizing radiation is a primary concern. The principle of As Low As Reasonably Achievable (ALARA) is paramount, as children are more radiosensitive than adults and have a longer lifetime over which potential radiation-induced effects could develop. For this reason, non-radiation modalities like MRI are strongly preferred whenever they can provide the necessary diagnostic information.

In many of the scenarios outlined by the ACR, such as suspected sensorineural hearing loss or central vertigo, MRI is the most appropriate initial study for both adults and children, carrying a relative radiation level of zero. However, for conditions requiring fine bony detail, such as evaluating the ossicles in conductive hearing loss or assessing cochlear anatomy for an implant, CT remains essential. When CT is necessary in a pediatric patient, protocols should be tailored to reduce the radiation dose, using techniques like lower tube current and voltage. The ACR guidelines often provide separate pediatric radiation level estimates for CT scans, reflecting these dose-reduction strategies. Clinicians should always weigh the diagnostic benefit of a CT scan against the long-term risks of radiation exposure in young patients.

Imaging Protocol Details for Hearing Loss and/or Vertigo

Once you’ve decided on the right study, the specific imaging protocol is critical for diagnostic accuracy. A non-contrast head CT ordered for trauma is very different from a high-resolution temporal bone CT designed to visualize the ossicular chain. Our protocol guides cover the essential technical parameters, contrast considerations, and key interpretation principles for the studies recommended in these guidelines.

• CT Brain Without Contrast

Tools to Help You Order the Right Study

Navigating imaging guidelines and radiation safety can be challenging in a busy clinical practice. GigHz provides a suite of free, easy-to-use tools to support evidence-based decision-making at the point of care.

The ACR Appropriateness Criteria Lookup tool allows you to quickly search the full ACR guidelines for thousands of clinical scenarios beyond hearing loss and vertigo, ensuring you can find the right test for any presentation. For detailed procedural information, the Imaging Protocol Library offers concise, practical guides on how major imaging studies are performed. To help with patient communication and safety, the Radiation Dose Calculator provides a simple way to estimate and track cumulative radiation exposure from medical imaging.

Why is MRI preferred for sensorineural hearing loss?

MRI is the preferred modality because sensorineural hearing loss (SNHL) originates from the inner ear (cochlea) or the vestibulocochlear nerve (cranial nerve VIII). MRI provides superior soft-tissue contrast, making it ideal for visualizing the nerve, brainstem, and inner ear structures. It is highly sensitive for detecting common causes of SNHL such as vestibular schwannomas (acoustic neuromas), other cerebellopontine angle tumors, inflammatory conditions, and demyelinating diseases like multiple sclerosis, which would be missed on CT.

When is a CT scan better than an MRI for hearing loss?

A CT scan is superior to MRI for evaluating the bony structures of the middle and inner ear. It is the study of choice for suspected conductive hearing loss when the cause is thought to be osseous, such as otosclerosis (abnormal bone growth), ossicular chain dislocation or erosion, or superior semicircular canal dehiscence. High-resolution temporal bone CT provides exquisite detail of these tiny bones and is also essential for preoperative planning for cochlear implants to assess the bony anatomy of the cochlea and mastoid.

Does vertigo always require imaging?

No, not all cases of vertigo require imaging. Many cases, particularly episodic vertigo, are caused by benign peripheral vestibular conditions like benign paroxysmal positional vertigo (BPPV) or vestibular neuritis. These conditions are typically diagnosed based on history and specific physical exam maneuvers (like the Dix-Hallpike test). Imaging is generally reserved for cases where the diagnosis is uncertain, symptoms are persistent or progressive, there are associated neurological signs (suggesting a central cause), or there is unilateral hearing loss, which could indicate a retrocochlear pathology like a vestibular schwannoma.

What is the difference between a routine brain MRI and an MRI of the internal auditory canals (IACs)?

An MRI of the internal auditory canals is a specialized brain MRI protocol focused on the 8th cranial nerve and the structures of the inner ear. It uses very thin, high-resolution imaging slices through the temporal bones and cerebellopontine angle. It also typically includes specific sequences, like a heavily T2-weighted sequence (e.g., FIESTA or CISS), to clearly visualize the fluid-filled inner ear and the nerves within the IAC. A routine brain MRI uses thicker slices and may not have the resolution or specific sequences needed to reliably detect small pathologies like an intracanalicular vestibular schwannoma.

Is intravenous contrast necessary for all MRIs for hearing loss or vertigo?

Not always, but it is often recommended. The ACR rates MRI with and without contrast as “Usually Appropriate” for most scenarios involving sensorineural hearing loss and vertigo. Gadolinium-based contrast agents are crucial for detecting and characterizing enhancing lesions like vestibular schwannomas, other tumors, and inflammatory or infectious processes. An MRI without contrast alone can also be appropriate and can detect many structural abnormalities, but it is less sensitive for small enhancing tumors. The decision to use contrast may depend on institutional protocol and the specific clinical suspicion.

Reviewed by Pouyan Golshani, MD, Interventional Radiologist — May 12, 2026