The hearing loss of<unk>  is often, although not always, present from birth, and language acquisition may be a significant problem if deafness is severe in childhood. The hearing loss typically worsens over the years, and progression can be step-wise and related to minor head trauma. In some cases, language development worsens after head injury, demonstrating that the inner ear is sensitive to trauma in<unk> ; this is as a consequence of the widened vestibular aqueducts usual in this syndrome. Vestibular function varies in<unk>  and vertigo can be a feature of minor head trauma. A goitre is present in 75% of all cases.
Pendred syndrome
MORM syndrome
McGillivray syndrome
Grisel's syndrome
Sly syndrome
Mungan syndrome
Lujan–Fryns syndrome
Fraser syndrome