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01-03-2018 | Review Article

Role of dual-energy CT in the diagnosis and follow-up of gout: systematic analysis of the literature

Authors: André Ramon, Amélie Bohm-Sigrand, Pierre Pottecher, Pascal Richette, Jean-Francis Maillefert, Herve Devilliers, Paul Ornetti

Published in: Clinical Rheumatology | Issue 3/2018

Abstract

The aim of this systematic review was to determine the potential role of dual-energy CT in the diagnosis and follow-up of gout with regard to the Outcome Measures in Rheumatology (OMERACT) filter. A systematic analysis of the literature was conducted using the MEDLINE and Cochrane databases and published abstracts of international congresses, according to the criteria of the OMERACT filter: feasibility, reproducibility, validity versus laboratory (serum urate, MSU synovial fluid aspirate) and other imaging modalities for gout, and its sensitivity to change in patients on urate lowering therapy (ULT). Thirty-two articles were found representing a total of 1502 patients. The data on feasibility showed that the examination took little time and involved low levels of radiation but had current limited availability. Intra- and inter-observer reproducibility was excellent, with intra-class correlation coefficients > 0.9. Validity in comparison with polarized-light microscopy showed good sensitivity and specificity (> 80%). The diagnostic performance was better than that of radiography and conventional CT-scan and at least equivalent to that of ultrasonography. The sensitivity to change varied with effect sizes from 0.05 (low) to 1.24 (high) for decrease in the tophus volume following different ULT in gout patients. Dual-energy CT-scan is a reproducible and accurate imaging modality for the diagnosis of gout, particularly for tophaceous gout (intra- or extra-articular). It can become a second-line imaging modality of choice in cases of diagnostic doubt, such as ultrasonography. Its role remains uncertain in the follow-up of gout patients treated with ULT and needs further clarification.

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Title: Role of dual-energy CT in the diagnosis and follow-up of gout: systematic analysis of the literature
Authors: André Ramon
Amélie Bohm-Sigrand
Pierre Pottecher
Pascal Richette
Jean-Francis Maillefert
Herve Devilliers
Paul Ornetti
Publication date: 01-03-2018
Publisher: Springer London
Published in: Clinical Rheumatology / Issue 3/2018
Print ISSN: 0770-3198
Electronic ISSN: 1434-9949
DOI: https://doi.org/10.1007/s10067-017-3976-z

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