Predicting dysthyroid optic neuropathy using computed tomography volumetric analyses of orbital structures

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art_GONCALVES_Predicting_dysthyroid_optic_neuropathy_using_computed_tomography_volumetric_2012.PDF (417.21 KB)
Citações na Scopus
31
Tipo de produção
article
Data de publicação
2012
DOI
SciELO
Scopus
Web of Science
PubMed
Título da Revista
ISSN da Revista
Título do Volume
Editora
HOSPITAL CLINICAS, UNIV SAO PAULO
Autores
Citação
CLINICS, v.67, n.8, p.891-896, 2012
Projetos de Pesquisa
Unidades Organizacionais
Fascículo
Resumo
OBJECTIVE: To evaluate the ability of orbital apex crowding volume measurements calculated with multidetector-computed tomography to detect dysthyroid optic neuropathy. METHODS: Ninety-three patients with Graves' orbitopathy were studied prospectively. All of the patients underwent a complete neuro-ophthalmic examination and computed tomography scanning. Volumetric measurements were calculated from axial and coronal contiguous sections using a dedicated workstation. Orbital fat and muscle volume were estimated on the basis of their attenuation values (in Hounsfield units) using measurements from the anterior orbital rim to the optic foramen. Two indexes of orbital muscle crowding were calculated: i) the volumetric crowding index, which is the ratio between soft tissue (mainly extraocular muscles) and orbital fat volume and is based on axial scans of the entire orbit; and ii) the volumetric orbital apex crowding index, which is the ratio between the extraocular muscles and orbital fat volume and is based on coronal scans of the orbital apex. Two groups of orbits (with and without dysthyroid optic neuropathy) were compared. RESULTS: One hundred and two orbits of 61 patients with Graves' orbitopathy met the inclusion criteria and were analyzed. Forty-one orbits were diagnosed with Graves' orbitopathy, and 61 orbits did not have optic neuropathy. The two groups of orbits differed significantly with regard to both of the volumetric indexes (p<0.001). Although both indexes had good discrimination ability, the volumetric orbital apex crowding index yielded the best results with 92% sensitivity, 86% specificity, 81%/94% positive/negative predictive value and 88% accuracy at a cutoff of 4.14. CONCLUSION: This study found that the orbital volumetric crowding index was a more effective predictor of dysthyroid optic neuropathy than previously described computed tomography indexes were.
Palavras-chave
Dysthyroid optic neuropathy, Multidetector computed tomography, Graves' orbitopathy, Volume CT
URI
https://observatorio.fm.usp.br/handle/OPI/906
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Coleções
Artigos e Materiais de Revistas Científicas - FM/MOF
Artigos e Materiais de Revistas Científicas - HC/ICHC
Artigos e Materiais de Revistas Científicas - HC/InRad
Artigos e Materiais de Revistas Científicas - LIM/33