Pinna abnormalities and low-set ears

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Medical findings based on ear anatomy Ear abnormalities Pinna of the newborn ear

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Pinna abnormalities and low-set ears

This condition describes the abnormalities of the shape or position of the external ear (pinna or auricle).

During fetal development, the outer ear or "pinna" forms at a time when many other critical organs are developing (such as the kidneys). Abnormalities in the shape or positioning of the pinna may be an indication that there are other associated abnormalities present.

Common abnormalities include abnormal folds in the pinna, prominence of the ears, low-set positioning, abnormal rotation of the pinna, and even absence of the pinna.

Many children are born with ears that stick out (protruding ears). Although people may comment on the ear shape, this condition is a variation of normal and is not associated with other disorders. However, low-set ears, absent pinna, and abnormal folds may be associated with various medical conditions.

The following common conditions are associated with low-set and malformed ears:

• Down syndrome
• Turner syndrome

Rare conditions associated with low-set and malformed ears include:

• Treacher Collins syndrome
• Potter syndrome
• Trisomy 18
• Beckwith-Wiedemann syndrome
• Trisomy 13
• Rubinstein-Taybi syndrome
• Smith-Lemli-Opitz syndrome

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