Low-set ears are a clinical feature in which the ears are positioned lower on the head than usual. They are present in many congenital conditions. Low-set ears are defined as
outer ears positioned two or more
standard deviations lower than the population average.
Clinically, if the point at which the helix of the
outer ear meets the cranium is at or below the line connecting the inner
canthi
The canthus (pl. canthi, palpebral commissures) is either corner of the eye where the upper and lower eyelids meet. More specifically, the inner and outer canthi are, respectively, the medial and lateral ends/angles of the palpebral fissure.
The ...
of eyes(bicanthal plane), the ears are considered low set.
Low-set ears can be associated with conditions such as:
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Down syndrome
Down syndrome or Down's syndrome, also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. It is usually associated with physical growth delays, mild to moderate intellectual dis ...
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Turner syndrome
Turner syndrome (TS), also known as 45,X, or 45,X0, is a genetic condition in which a female is partially or completely missing an X chromosome. Signs and symptoms vary among those affected. Often, a short and webbed neck, low-set ears, low hair ...
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Noonan syndrome
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Patau syndrome
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DiGeorge syndrome
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Cri du chat syndrome
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Edwards syndrome
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Fragile X syndrome
Fragile X syndrome (FXS) is a genetic disorder characterized by mild-to-moderate intellectual disability. The average IQ in males with FXS is under 55, while about two thirds of affected females are intellectually disabled. Physical features may ...
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Okamoto syndrome
It is usually bilateral, but it can be unilateral in
Goldenhar syndrome.
See also
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LEOPARD syndrome
References
External links
Diseases of the ear and mastoid process
Congenital disorders of ears
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