Congenital-Aural-Atresia-slides-030108

Congenital-Aural-Atresia-slides-030108 - Congenital Aural...

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Congenital Aural Atresia Congenital Aural Atresia Elizabeth J. Rosen, MD Arun K. Gadre, MD 1/8/03
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Congenital Aural Atresia Congenital Aural Atresia Embryology Classification Evaluation Surgical Repair Results Complications Controversies
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Congenital Aural Atresia Congenital Aural Atresia Definition: “a birth defect that is characterized by hypoplasia of the external auditory canal, often in association with dysmorphic features of the auricle, middle ear and, occasionally, the inner ear structures” --Harold F. Schuknecht, 1989
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Congenital Aural Atresia Congenital Aural Atresia Incidence: 1 in 10,000-20,000 Unilateral 3-5x more common than Bilateral Males > Females Right > Left Inheritance—sporadic Autosomal recessive or dominant
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Congenital Aural Atresia Congenital Aural Atresia Associations Hydrocephalus Posterior cranial hypoplasia Hemifacial microsomia Cleft palate GU anomalies Syndromes Treacher-Collins Goldenhar’s Crouzon’s Mobius’ Klippel-Feil Fanconi’s DiGeorge Pierre Robin VATER CHARGE
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Embryology Embryology Auricle 4 th week of gestation 1 st and 2 nd branchial arches Hillocks of His 1—tragus 2—helical crus 3—helix 4—antihelix 5—antitragus 6—lobule
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Embryology Embryology External Auditory Canal 8 th week of gestation 1 st branchial groove Medial migration of a solid core of epithelial cells Recanalization during 6-7 th months of gestation
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Embryology Embryology Ossicles 4 th week of gestation Meckel’s cartilage Malleus head and neck Incus body and short process Reichert’s cartilage Malleus handle Incus long process Stapes suprastructure
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Embryology Embryology Labyrinth 3 rd week of gestation Invagination of otic placode to form otic vesicle Semicircular canals— 6 th week Utricle and Saccule— 8 th week Cochlea—7-12 th weeks
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Embryology Embryology Facial Nerve 4-5 weeks of gestation
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This note was uploaded on 12/28/2011 for the course STEP 1 taught by Professor Dr.aslam during the Fall '11 term at Montgomery College.

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Congenital-Aural-Atresia-slides-030108 - Congenital Aural...

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