Prevalence of ectopic intrathyroidal thymus in Japan: the Fukushima health management survey.
Thyroid
; 25(5): 534-7, 2015 May.
Article
em En
| MEDLINE
| ID: mdl-25778711
ABSTRACT
BACKGROUND:
Ectopic intrathyroidal thymus is thought to be a rare entity, often discovered incidentally, and is due to aberrant thymic migration during embryogenesis.OBJECTIVE:
The aim of this study was to determine the prevalence of ectopic intrathyroidal thymus in children using ultrasound screening.METHODS:
This study was cross-sectional and was conducted with the initial preliminary survey of the Fukushima Health Management Survey between October 9, 2011, and March 31, 2012, after the Fukushima Daiichi Nuclear Power Plant accident. A total of 37,816 children were examined in the survey.RESULTS:
Diagnostic criteria are based on the ultrasonographic appearance of ectopic intrathyroidal thymus, which were round, oval, or polygonal hypoechoic or hyperechoic areas, with multiple granular and punctate echogenic foci. A total of 375 (0.99%) cases (164 girls) with ectopic intrathyroidal thymus were observed. The mean age was 7.0 years (range 0-18 years). Ectopic intrathyroidal thymus was located in the right (n=180), left (n=178), or bilateral (n=17) thyroid lobes. The incidence of ectopic intrathyroidal thymus was inversely correlated with age and body mass index.CONCLUSION:
The results reflect the prevalence of ectopic intrathyroidal thymus using ultrasonography in the general population. Further examination will be needed by way of longitudinal follow-up.
Texto completo:
1
Temas:
ECOS
/
Gestao
Bases de dados:
MEDLINE
Assunto principal:
Timo
/
Doenças da Glândula Tireoide
/
Glândula Tireoide
/
Coristoma
Tipo de estudo:
Diagnostic_studies
/
Observational_studies
/
Prevalence_studies
/
Risk_factors_studies
Limite:
Adolescent
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Child
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Child, preschool
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Female
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Humans
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Infant
/
Male
País/Região como assunto:
Asia
Idioma:
En
Revista:
Thyroid
Assunto da revista:
ENDOCRINOLOGIA
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Japão