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Aural atresia is the underdevelopment of the middle ear and canal and usually occurs in conjunction with microtia. Atresia occurs because patients with microtia may not have an external opening to the ear canal, though. However, the cochlea and other inner ear structures are usually present.
Burt Brent is a retired reconstructive plastic surgeon best known for his work in reconstructing the absent outer ear. He built upon the techniques of his mentor, Dr. Radford Tanzer [1] of the Mary Hitchcock Clinic at Dartmouth Medical School and repaired ear defects in 1,800 patients, most of them children born with ear deformities such as microtia.
Bronchial atresia is a rare congenital disease characterized by segmental or lobar emphysema and, in some cases, mucoid impaction. The exact cause of bronchial atresia is unknown; the lobar bronchi, subsegmental bronchi, and distal bronchioles develop in the fifth, sixth, and sixteenth weeks of fetal development, respectively.
The surgical option is cosmetic reconstruction of the external ear's normal shape and repair of the ear canal. In less severe cases, the reconstruction will be sufficient to restore hearing. In grades of anotia/microtia that affect the middle ear, the surgery with the use of a bone-anchored hearing aid (BAHA) will likely restore the hearing ...
Freudenthal initially described these species in the genus Microtia in 1976 [1] (with reference to Microtus, a vole with similar teeth), but later the same scholar renamed the genus to Mikrotia in 2006, [2] since the name Microtia was already preoccupied by a butterfly genus named in 1864. [3]
744 Congenital anomalies of ear, face, and neck. 744.0 Anomalies of ear causing impairment of hearing; 744.1 Accessory auricle; 744.2 Other specified congenital anomalies of ear. 744.22 Macrotia; 744.23 Microtia; 744.3 Unspecified congenital anomaly of ear; 744.4 Branchial cleft cyst or fistula; preauricular sinus; 744.5 Webbing of neck
In one 1997 study of white cats, 72% of the animals were found to be totally deaf. The entire organ of Corti in the cochlea was found to have degenerated in the first few weeks after birth; however, even during these weeks no brain stem responses could be evoked by auditory stimuli, suggesting that these animals had never experienced any ...
Deafness in animals can occur as either unilateral (one ear affected) or bilateral (both ears affected). This occurrence of either type of deafness seems to be relatively the same in both mixed-breed animals and pure-breed animals. [5] Research has found a significant association between deafness in dogs and the pigment genes piebald and merle ...