Resonance imaging of the eustachian tube cartilage in microtia.

Abstract:

OBJECTIVE:The purpose of this study was to determine whether external and internal defects in microtia are related. METHOD:Magnetic resonance images of the eustachian tube cartilage were evaluated for 20 patients who had unilateral microtia. Nineteen patients were classified as Grade 2, and one was classified as Grade 3. The Grade 3 patient also had unilateral facial palsy. RESULTS:On T1-, T2-, and proton-density-weighted images, the eustachian tube cartilage was clearly identified as a pair of straight lines with low signal intensity. There was no evidence of hypoplasia of the eustachian tube cartilage on the microtic side in any Grade 2 patient, but hypoplasia was evident on the microtic side of the patient classified as Grade 3. CONCLUSION:These findings are consistent with the view that impairment of embryonic development before 6 weeks results in injury to the immature primordium and malformation of both the external and middle ear. In contrast, injuries that occur at a later fetal age (i.e., after 3 months) do not appear to cause middle ear malformations.

authors

Imai Y,Matsuo K,Imai N

doi

10.1597/1545-1569_1998_035_0026_riotet_2.3.co_2

subject

Has Abstract

pub_date

1998-01-01 00:00:00

pages

26-34

issue

1

eissn

1055-6656

issn

1545-1569

journal_volume

35

pub_type

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