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Accuracy, intermethod agreement, and inter-reviewer agreement for use of magnetic resonance imaging and myelography in small-breed dogs with naturally occurring first-time intervertebral disk extrusion.
J Am Vet Med Assoc. 2012 Apr 15; 240(8):969-77.JA

Abstract

OBJECTIVE

To determine accuracy, intermethod agreement, and inter-reviewer agreement for multisequence magnetic resonance imaging (MRI) and 2-view orthogonal myelography in small-breed dogs with first-time intervertebral disk (IVD) extrusion.

DESIGN

Prospective evaluation study.

ANIMALS

24 dogs with thoracolumbar IVD extrusion.

PROCEDURES

Each dog underwent MRI and myelography. Images obtained with each modality were independently evaluated and assigned standardized scores in a blinded manner by 3 reviewers. Results were compared with surgical findings. Inter-reviewer and intermethod agreements were assessed via κ statistics. Accuracy was assessed as the percentage of dogs for which ≥ 2 of 3 reviewers recorded findings identical to those determined surgically.

RESULTS

Inter-reviewer agreement was substantial for site (κ = 0.70) and side of IVD extrusion (κ = 0.62) in T2-weighted magnetic resonance images and was substantial for site (κ = 0.72) and fair for side of extrusion (κ = 0.37) in myelographic images. Agreement for site between each modality and surgical findings was near perfect (κ = 0.94 and 0.88 for MRI and myelography, respectively). Intermethod agreement was substantial for site (κ = 0.71) and moderate for side of extrusion (κ = 0.40). Accuracy of MRI for site and side was 100% when results for T1-weighted, T2-weighted, and contrast-enhanced T1-weighted sequences were combined. Accuracy of myelography was 90.9% and 54.5% for site and side, respectively.

CONCLUSIONS AND CLINICAL RELEVANCE

Agreement between imaging results and surgical findings for identification of IVD extrusion sites in small-breed dogs was similar for MRI and myelography. However, MRI appeared to be more accurate than myelography and allowed evaluation of extradural compressive mass composition.

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Publisher Full Text

Authors+Show Affiliations

Bos AS
Departments of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, ON, N1G 2W1, Canada. abos@vetemergency.ca
Brisson BA
No affiliation info available
Nykamp SG
No affiliation info available
Poma R
No affiliation info available
Foster RA
No affiliation info available

MeSH

AnimalsBody SizeDog DiseasesDogsIntervertebral Disc DisplacementMagnetic Resonance ImagingMyelographyObserver VariationSensitivity and Specificity

Pub Type(s)

Evaluation Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22471826

Citation

Bos, Alexandra Squires, et al. "Accuracy, Intermethod Agreement, and Inter-reviewer Agreement for Use of Magnetic Resonance Imaging and Myelography in Small-breed Dogs With Naturally Occurring First-time Intervertebral Disk Extrusion." Journal of the American Veterinary Medical Association, vol. 240, no. 8, 2012, pp. 969-77.
Bos AS, Brisson BA, Nykamp SG, et al. Accuracy, intermethod agreement, and inter-reviewer agreement for use of magnetic resonance imaging and myelography in small-breed dogs with naturally occurring first-time intervertebral disk extrusion. J Am Vet Med Assoc. 2012;240(8):969-77.
Bos, A. S., Brisson, B. A., Nykamp, S. G., Poma, R., & Foster, R. A. (2012). Accuracy, intermethod agreement, and inter-reviewer agreement for use of magnetic resonance imaging and myelography in small-breed dogs with naturally occurring first-time intervertebral disk extrusion. Journal of the American Veterinary Medical Association, 240(8), 969-77. https://doi.org/10.2460/javma.240.8.969
Bos AS, et al. Accuracy, Intermethod Agreement, and Inter-reviewer Agreement for Use of Magnetic Resonance Imaging and Myelography in Small-breed Dogs With Naturally Occurring First-time Intervertebral Disk Extrusion. J Am Vet Med Assoc. 2012 Apr 15;240(8):969-77. PubMed PMID: 22471826.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Accuracy, intermethod agreement, and inter-reviewer agreement for use of magnetic resonance imaging and myelography in small-breed dogs with naturally occurring first-time intervertebral disk extrusion. AU - Bos,Alexandra Squires, AU - Brisson,Brigitte A, AU - Nykamp,Stephanie G, AU - Poma,Roberto, AU - Foster,Robert A, PY - 2012/4/5/entrez PY - 2012/4/5/pubmed PY - 2012/8/3/medline SP - 969 EP - 77 JF - Journal of the American Veterinary Medical Association JO - J Am Vet Med Assoc VL - 240 IS - 8 N2 - OBJECTIVE: To determine accuracy, intermethod agreement, and inter-reviewer agreement for multisequence magnetic resonance imaging (MRI) and 2-view orthogonal myelography in small-breed dogs with first-time intervertebral disk (IVD) extrusion. DESIGN: Prospective evaluation study. ANIMALS: 24 dogs with thoracolumbar IVD extrusion. PROCEDURES: Each dog underwent MRI and myelography. Images obtained with each modality were independently evaluated and assigned standardized scores in a blinded manner by 3 reviewers. Results were compared with surgical findings. Inter-reviewer and intermethod agreements were assessed via κ statistics. Accuracy was assessed as the percentage of dogs for which ≥ 2 of 3 reviewers recorded findings identical to those determined surgically. RESULTS: Inter-reviewer agreement was substantial for site (κ = 0.70) and side of IVD extrusion (κ = 0.62) in T2-weighted magnetic resonance images and was substantial for site (κ = 0.72) and fair for side of extrusion (κ = 0.37) in myelographic images. Agreement for site between each modality and surgical findings was near perfect (κ = 0.94 and 0.88 for MRI and myelography, respectively). Intermethod agreement was substantial for site (κ = 0.71) and moderate for side of extrusion (κ = 0.40). Accuracy of MRI for site and side was 100% when results for T1-weighted, T2-weighted, and contrast-enhanced T1-weighted sequences were combined. Accuracy of myelography was 90.9% and 54.5% for site and side, respectively. CONCLUSIONS AND CLINICAL RELEVANCE: Agreement between imaging results and surgical findings for identification of IVD extrusion sites in small-breed dogs was similar for MRI and myelography. However, MRI appeared to be more accurate than myelography and allowed evaluation of extradural compressive mass composition. SN - 1943-569X UR - https://www.unboundmedicine.com/medline/citation/22471826/Accuracy_intermethod_agreement_and_inter_reviewer_agreement_for_use_of_magnetic_resonance_imaging_and_myelography_in_small_breed_dogs_with_naturally_occurring_first_time_intervertebral_disk_extrusion_ L2 - https://avmajournals.avma.org/doi/10.2460/javma.240.8.969?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -
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