Isolated congenital ossicular anomalies.

Area of Science:

• Otolaryngology
• Medical Imaging
• Genetics

Background:

• Congenital ossicular anomalies are diverse and impact hearing.
• Accurate classification is crucial for surgical planning and outcome prediction.
• Existing classification systems may not fully capture the spectrum of anomalies.

Purpose of the Study:

• To describe isolated congenital ossicular anomalies in patients with normal tympanic membranes.
• To evaluate the surgical outcomes of these anomalies.
• To propose a modified classification system for congenital ossicular anomalies.

Main Methods:

• Retrospective review of 78 patients (94 ears) with congenital ossicular anomalies.
• Analysis of preoperative and postoperative audiological findings.
• Correlation of surgical findings and temporal bone CT results with a modified classification.

Main Results:

• Twenty-one types of ossicular anomalies were identified.
• Stapes footplate fixation was the most common anomaly, often bilateral.
• Incus and malleus anomalies were typically unilateral.
• A modified classification based on stapes footplate status identified severe anomalies and predicted hearing outcomes.

Conclusions:

• Isolated congenital ossicular anomalies exhibit significant diversity.
• The proposed modified Teunissen and Cremers classification enhances evaluation of these anomalies.
• This classification aids in predicting surgical outcomes for congenital ossicular anomalies.