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Bosma arhinia microphthalmia syndrome

Bosma arhinia microphthalmia syndrome (BAMS) is a rare condition characterised by abnormalities of the nose and eyes and problems with puberty.

Beskrivning

Bosma arhinia microphthalmia syndrome (BAMS) is a rare condition characterised by abnormalities of the nose and eyes and problems with puberty.

The key feature of BAMS is arhinia, which is the absence of an external nose. While most people with BAMS are born without a nose, some affected individuals have a severely underdeveloped (hypoplastic) nose. Affected individuals may also be missing the brain structure involved in the sense of smell (olfactory bulb). Because of these abnormalities, people with BAMS have an impaired ability to smell and, consequently, to taste.

In most people with BAMS, the eyeballs are abnormally small (microphthalmia) or absent (anophthalmia), which causes severe vision impairment or blindness. Additional eye abnormalities common in BAMS include a gap or hole in one of several structures of the eye (coloboma) and clouding of the lenses of the eyes (cataracts).

Additional head and face abnormalities that can occur in people with BAMS include a high arch or opening in the roof of the mouth (high-arched or cleft palate), absence of the sinuses behind the nose (paranasal sinuses), blockage of the nasal passages (choanal atresia), narrowing of the tear ducts (nasolacrimal duct stenosis), or a small upper jaw (hypoplastic maxilla). Many of these abnormalities contribute to difficulty breathing, particularly in affected babies. Some affected individuals have abnormal external ears.

Individuals with BAMS also have hypogonadotropic hypogonadism, which is a condition caused by reduced production of hormones that direct sexual development. Without treatment, these hormone problems often result in delayed puberty. Affected males may also have underdeveloped reproductive tissues and undescended testes (cryptorchidism).

Inheritance patterns

The source lists the following possible inheritance patterns: Autosomal dominant. More than one pattern can apply in different cases.

Other names

Arhinia choanal atresia microphthalmia

Arhinia, choanal atresia, and microphthalmia

Arhinia, choanal atresia, microphthalmia, and hypogonadotropic hypogonadism

BAM syndrome

BAMS

Bosma syndrome

Gifford-Bosma syndrome

Hyposmia-nasal and ocular hypoplasia-hypogonadotropic hypogonadism syndrome

Ruprecht Majewski syndrome

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Artikelhistorik

Informationen på denna sida är skriven och granskad av kvalificerade kliniker.
  • 21 Mar 2023 | Senaste versionen
  • 1 Jul 2017 | Ursprungligen publicerad

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