What is the male:female ratio for isolated cleft palate?
What is the male:female ratio for cleft lip, with or without cleft palate?
What is the incidence of congenital hearing loss?
What is the incidence of carcinoma arising in a thyroglossal duct cyst?
What percent of these require surgical intervention?
What are the four clinical subtypes ofWaardenburg's syndrome?
- 1. SNHL (20%), heterochromia irides, pigment anomalies, dystopia canthorum.
- 2. As above, without dystopia canthorum (SNHL in >so%).
- 3• Klein-Waardenburg's syndrome: microcephaly, mental retardation, limb and skeletal abnormalities, in addition to signs of #1.
- 4•Shah-Waardenburg's syndrome: #2 + Hirschsprung's disease
What are the three clinical subtypes of Usher's syndrome?
- I-Severe-profound hearing loss, absent vestibular function, prepubertal retinitis pigmentosa.
- II-Moderate-severe hearing loss, normal vestibular function, postpubertal retinitis pigmentosa.
- III-Progressive hearing loss.
What percent of congenital hearing loses are hereditary?
What is the incidence of cleft lip, with or without cleft palate, in term newborns?
1 In 1000.
What is the incidence of submucous cleft palate in term newborns?
1 In 1200.
What is the incidence of isolated cleft palate in term newborns?
1 In 2000.
What is the incidence of congenital aural atresia?
What percent of children with congenital CMV have hearing loss?
10% are born with hearing loss, 10-15% eventually develop hearing loss.
What percent of infants with laryngomalacia require surgical treatment?
What percent of cases of choanal atresia involve only a mucosal diaphragm or membrane?
What are the typical inheritance patterns of nonsyndromic hearing loss?
10-20% AD, 75% autosomal recessive (AR), 2-3% X-linked,
What percent of infants have a hemangioma by age 1?
What percent of gliomas have a fibrous tract connecting to the subarachnoid space?
What is the incidence of synchronous airway lesions in children with laryngomalacia?
What is the incidence ofWaardenburg's syndrome?
1in 4,000 births.
Birth trauma accounts for what percent of vocal cord paralysis in children?
20% (associated with forceps use and C-section).
What percent of cases of congenital vocal cord paralysis are bilateral?
What is the recovery rate for idiopathic vocal cord paralysis in children?
What percent of Thyroglossal duct cyst contains thyroid tissue?
What percent of preauricular pits are bilateral?
What percent of teratomas become malignant?
What is the incidence of hemangiomas in premature infants weighing less than 1000 g?
What is the incidence of facial nerve displacement in congenital aural atresia?
What percent of sporadic cases of congenital hearing loss are caused by mutation of the DFNB1 gene on chromosome 13, encoding for Connexin-26?
What percent of congenital cholesteatomas are bilateral?