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Developmental anomaly of the process of Folius
T Minatogawa1, N Kanoh, T Kumoi
1Department of Otolaryngology, Hyogo College of Medicine, Nishinomya, Japan.
Summary
This study details four cases of ossicular anomalies, specifically malformations of the malleus handle. Researchers identified abnormal bony structures, potentially originating from the os goniale, impacting middle ear development.
Area of Science:
- Otolaryngology
- Developmental biology
- Anatomy
Background:
- Ossicular anomalies can lead to conductive hearing loss.
- The malleus, a middle ear ossicle, plays a crucial role in sound transmission.
- Understanding the developmental origins of ossicular malformations is essential for diagnosis and treatment.
Observation:
- Four cases of ossicular anomalies involving the malleus handle were analyzed.
- Abnormal bony bars fused with the tympanic bone and absent malleus landmarks (short process, umbo) were observed.
- A V-shaped ossicle connected by fibrous tissue to the malleus head was noted in one case.
Findings:
- The observed bony bars are hypothesized to be abnormally developed mesenchyme bone (os goniale), representing an aberrant anterior process of the malleus.
- The findings suggest a potential developmental pathway for malleus handle malformations originating from the os goniale.
- A V-shaped ossicle was also considered a malformed os goniale.
Implications:
- These findings contribute to the understanding of rare ossicular malformations.
- Accurate identification of these anomalies can aid in diagnosing hearing loss.
- Further research into the developmental genetics of the os goniale may reveal insights into middle ear development.