Auricular Dysmorphia – Causes, Types and Treatment
Auricular dysmorphia refers to a malformation or shape abnormality of the outer ear, which can be congenital or acquired and may affect both the appearance and function of the ear.
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Auricular dysmorphia refers to a malformation or shape abnormality of the outer ear, which can be congenital or acquired and may affect both the appearance and function of the ear.
What is Auricular Dysmorphia?
Auricular dysmorphia is an umbrella term for congenital or acquired malformations of the outer ear (auricle). The auricle consists of elastic cartilage covered by skin and has a characteristic three-dimensional fold structure. Deviations from this normal shape – whether in size, form, position, or structure – are referred to as auricular dysmorphia. Depending on the severity, the malformation may be purely cosmetic or may also cause functional impairment of hearing.
Types and Classification
Auricular dysmorphias are classified according to their type and severity:
- Prominent ears (Otapostasis): The most common form, in which the ears protrude excessively from the head. This is usually caused by incomplete formation of the antihelix or an enlarged concha.
- Microtia: Underdevelopment of the auricle, ranging from a small, rudimentary outer ear to complete absence (anotia).
- Macrotia: An enlarged auricle that significantly exceeds normal dimensions.
- Cup ear: The auricle is rolled forward and constricted, which can impair hearing.
- Lop ear: The upper third of the auricle is folded forward and downward.
- Cryptotia: The upper portion of the auricle is embedded beneath the scalp and is not free-standing.
- Acquired dysmorphias: For example, following injuries, burns, or conditions such as cauliflower ear (after repeated hematomas).
Causes
The causes of auricular dysmorphia are varied:
- Genetic factors: Many malformations are hereditary or occur as part of syndromes (e.g., Treacher Collins syndrome, Goldenhar syndrome).
- Embryonic developmental disturbances: External influences during embryonic development (infections, medications, radiation) can disrupt ear formation.
- Mechanical causes: Abnormal positioning in the womb can influence ear shape.
- Trauma: Injuries or surgical procedures can permanently alter the shape of the auricle.
Symptoms and Impact
Symptoms depend on the type and extent of the dysmorphia:
- Noticeable ear shape or position that deviates from the norm
- Possible hearing impairment in severe malformations (e.g., microtia with aural atresia)
- Psychosocial burden, particularly in children and adolescents due to teasing or reduced self-image
- Difficulties wearing glasses or hearing aids
Diagnosis
Diagnosis is typically made clinically through physical examination. For more complex malformations or functional limitations, additional investigations are carried out:
- ENT examination: Assessment of ear shape as well as the ear canal and eardrum
- Audiological testing: Measurement of hearing ability, especially when an accompanying hearing disorder is suspected
- Imaging (CT/MRI): In severe malformations, to assess cartilage and bone structure as well as the middle ear
- Genetic testing: When a syndromic cause is suspected
Treatment
Treatment depends on the type of malformation, its severity, and the degree of distress experienced by the patient:
Conservative Therapy
In newborns, some ear deformities can be corrected using special ear splints or ear molding devices (e.g., the EarWell system), as ear cartilage remains highly malleable during the first weeks of life. This method is most effective when started within the first two to four weeks after birth.
Surgical Therapy
In older children and adults, surgical intervention is usually required:
- Otoplasty (ear pinning): Correction of prominent ears through cartilage reshaping and fixation of the auricle in a more natural position. The optimal timing is generally before school age (around 5-6 years).
- Auricular reconstruction: In cases of severe microtia, the auricle is reconstructed using autologous rib cartilage or synthetic materials (e.g., Medpor). This procedure requires multiple surgical stages.
- Laser treatments and scar management: For acquired dysmorphias following injuries.
Hearing Aids and Rehabilitation
For associated hearing disorders, particularly microtia with aural atresia, bone-anchored hearing aids (BAHA) or conventional hearing aids are used. Early audiological care is essential for language development in children.
References
- Weerda, H. - Chirurgie der Ohrmuschel: Verletzungen, Defekte und Anomalien. Thieme Verlag, Stuttgart, 2004.
- Brent, B. - Microtia repair with rib cartilage grafts. Clinics in Plastic Surgery, 1990; 17(2):263-285. PubMed PMID: 2189583.
- Byrd, H. S., Langevin, C. J., Ghidoni, L. A. - Ear molding in newborn infants with auricular deformities. Plastic and Reconstructive Surgery, 2010; 126(4):1191-1200.
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