Kavanagh, Richard G;
Liddy, Stephen;
Carroll, Anne G;
Purcell, Yvonne M;
Smyth, Anna E;
Khoo, S Guan;
McNeill, Graeme;
Malone, Dermot E;
Killeen, Ronan P
Rapid diffusion-weighted MRI for the investigation of recurrent temporal bone cholesteatoma
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Media type:
E-Article
Title:
Rapid diffusion-weighted MRI for the investigation of recurrent temporal bone cholesteatoma
Contributor:
Kavanagh, Richard G;
Liddy, Stephen;
Carroll, Anne G;
Purcell, Yvonne M;
Smyth, Anna E;
Khoo, S Guan;
McNeill, Graeme;
Malone, Dermot E;
Killeen, Ronan P
Published:
SAGE Publications, 2020
Published in:
The Neuroradiology Journal, 33 (2020) 3, Seite 210-215
Language:
English
DOI:
10.1177/1971400920920784
ISSN:
1971-4009;
2385-1996
Origination:
Footnote:
Description:
Background Suspected cholesteatoma recurrence is commonly investigated with magnetic resonance imaging (MRI) of the temporal bone. Non-echo planar diffusion-weighted imaging (non-EP DWI) has become the sequence of choice. Purpose To assess the agreement between an MRI protocol incorporating both non-EP DWI and contrast-enhanced sequences, and a shortened protocol without contrast-enhanced sequences in the assessment of suspected cholesteatoma recurrence. Materials and methods One hundred consecutive MRIs, consisting of T2-weighted, non-EP DWI and pre- and post-contrast T1-weighted sequences, were reviewed by two radiologists at a tertiary referral centre. Agreement between the two protocols was assessment by means of a weighted Cohen kappa coefficient. Results We found a near perfect agreement between the two protocols (kappa coefficient with linear weighting 0.98; 95% confidence interval 0.95–1.00). There were two cases in which the two protocols were discordant. In both cases, the lesion measured <3 mm and images were degraded by artefact at the bone–air interface. The shortened protocol without post-contrast sequences yielded a 32% reduction in acquisition time. Conclusion When non-EP DWI is available, contrast-enhanced sequences can be omitted in the vast majority of cases without compromising diagnostic accuracy. Contrast-enhanced sequences may provide additional value in equivocal cases with small (<3 mm) lesions or in cases where images are degraded by artefact.