Methodology
Temporal bone computed tomography findings in bilateral
sensorineural hearing loss
D E Bamioua, P Phelpsb, T Sirimannaa
a Audiology
Department, Great Ormond Street Hospital for Sick Children, London
WC1N 3JH, UK, b Radiology Department, Great Ormond Street
Hospital for Sick Children
Correspondence to: Dr Bamiou email: doriseva{at}ndirect.co.uk
Accepted 22 November 1999
AIM
To examine the
yield of computed tomography (CT) of the temporal bones when
investigating sensorineural hearing loss (SNHL) and to identify factors
associated with CT findings.
METHODSRetrospective
analysis of 116 consecutively investigated children with bilateral SNHL
at the audiology department of Great Ormond Street Hospital, London.
Main outcome measures were CT results, hearing loss parameters,
history, and clinical examination.
RESULTSA total of 33 (28.4%) CT scans were identified as abnormal. Children with profound
and/or progressive hearing loss and/or craniofacial abnormalities were
more likely to have an abnormal CT scan and together accounted for 25 abnormal CT scans. Sex, consanguineous parents, or family history of
SNHL were not associated with CT findings. Dilated vestibular aqueduct
was significantly correlated with the presence of progressive SNHL.
CONCLUSIONSAll
children with SNHL should undergo radiological investigation of the
petrous bones/inner ear; abnormalities are more likely to be found in
cases with craniofacial abnormalities, or profound or progressive
hearing loss. The decision whether to perform a CT or magnetic
resonance imaging will depend on scanner availability, expertise, and
management considerations, but cochlear implant candidates will
require both.
Keywords: computed tomography; sensorineural hearing loss
© 2000 by Archives of Disease in Childhood
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