Pinna abnormalities and low-set ears refer to an abnormal shape or position of the outer ear (pinna or auricle).
Low-set ears; Microtia; "Lop" ear
The outer ear or "pinna" forms when the baby is growing in the mother's womb. The growth of this ear part takes place at a time when many other organs are developing (such as the kidneys). Abnormalities in the shape or position of the pinna may be a sign that the baby also has other related problems.
Common abnormalities include cysts in the pinna or skin tags.
Many children are born with ears that stick out. Although people may comment on the ear shape, this condition is a variation of normal and is not linked with other disorders.
However, the following problems may be related to medical conditions:
Abnormal folds or location of the pinna
No opening to the ear canal
No pinna and ear canal (anotia)
Common conditions that can cause low-set and unusually formed ears include:
In most cases, a health care provider finds pinna abnormalities during the first well-baby exam. This exam is most often done at the hospital at the time of delivery.
What to expect at your health care provider's office
The doctor will:
Examine and test the child for other physical abnormalities of the kidneys, bones of the face, skull, and facial nerve
Ask if you have a family history of abnormal-shaped ears
To determine whether the pinna is abnormal, the doctor will take measurements with a tape measure. Other parts of the body will also be measured, including the eyes, hands, and feet.
All newborns should have a hearing test. Exams for any changes in mental development may be performed as the child grows. Genetic testing may also be done.
Most of the time, no treatment is needed for pinna abnormalities because they do not affect hearing. However, sometimes cosmetic surgery is recommended.
Skin tags may be tied off, unless there is cartilage in them. In that case, surgery is needed to remove them.
Ears that stick out may be treated for cosmetic reasons. During the newborn period, a small framework may be attached using tape or Steri-Strips. The child wears this framework for several months. Surgery to correct the ears cannot be done until the child is 5 years old.
More severe abnormalities may require surgery for cosmetic reasons as well as for function. Surgery to create and attach a new ear is often done in stages.
Haddad J Jr. Congenital malformations. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 630.
Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.