Tympanic membrane perforations cannot be reliably detected using computed tomography based on 15 cadaver dogs.

Area of Science:

• Veterinary medicine
• Diagnostic imaging
• Otolaryngology

Background:

• Tympanic membrane integrity is crucial for diagnosing and treating canine ear disease.
• Otoscopic examination can be challenging due to external ear canal issues or patient behavior.
• Computed tomography (CT) aids middle ear evaluation but its accuracy for tympanic membrane defects is questioned.

Purpose of the Study:

• To prospectively assess the reliability of CT in detecting tympanic membrane perforations in dogs.
• To evaluate observer agreement on CT findings related to tympanic membrane integrity.
• To determine if CT findings can guide clinical treatment recommendations for canine ear conditions.

Main Methods:

• Fifteen canine cadavers were used for the study.
• Tympanic membranes were either left intact or intentionally perforated via myringotomy.
• CT scans were performed post-myringotomy, followed by blinded evaluation by four observers.

Main Results:

• The overall accuracy for detecting tympanic membrane perforations on CT was low (44%).
• Interobserver agreement among the four evaluators was only fair.
• CT scans showed apparent defects even in intact tympanic membranes, leading to misinterpretation.

Conclusions:

• CT is not a reliable tool for accurately detecting or excluding tympanic membrane perforations in dogs.
• Clinical decisions regarding canine ear disease should not solely rely on CT findings of the tympanic membrane.
• Further research may be needed to improve imaging techniques for canine tympanic membrane assessment.