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Thoracic involvement in Erdheim-Chester disease: computed tomography imaging findings and their association with the BRAFV600E mutation

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Abstract

Objectives

To investigate the computed tomography (CT) thoracic findings in Erdheim-Chester disease (ECD) and evaluate the association of these findings with the BRAFV600E mutation.

Methods

This was a prospective study of patients with ECD (n=61, men=46) who underwent thoracic CT imaging. CT examinations were independently interpreted by two experienced radiologists. Association of imaging findings with BRAFV600E was achieved via the Chi-square or Fisher’s exact test and odds ratios (OR) with 95% confidence intervals (CI), as appropriate.

Results

Fifty-five ECD patients (90%) showed pulmonary findings, which included interlobular septal thickening (69%), pulmonary nodules (62%), airway thickening (13%) and ground glass opacities (36%). Pulmonary nodules were classified by the pattern of distribution: subpleural regions (36%), lung parenchyma (13%) and both regions (13%). Pleural and mediastinal involvement were present in 15% and 62% of cases, respectively. The most common mediastinal finding was sheathing of the right coronary artery (34%), followed by sheathing of the thoracic aorta (30%). The BRAFV600E mutation, positive in 31 patients, was associated with the frequency of sheathing of the coronary arteries (p = 0.01).

Conclusions

Of the thoracic findings reported in this study, we found a statistically significant positive association between the BRAFV600E mutation and presence of coronary artery sheathing.

Key Points

• To assess the degree of thoracic involvement in ECD with CT.

• BRAF V600E mutation has a high association with right coronary artery sheathing.

• BRAF V600E genetic testing detects patients at high risk of developing RCA sheathing.

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Abbreviations

CI:

Confidence interval

CT:

Computed tomography

ECD:

Erdheim-Chester disease

ERK:

Extracellular signal-regulated kinase

HIPPA:

Health Insurance Portability and Accountability Act

LCH:

Langerhans cell histiocytosis

MAP:

Mitogen-activated protein

MDCT:

Multi-detector computed tomography

NHGRI:

National Human Genome Research Institute

OR:

Odds ratio

RCA:

Right coronary artery

SD:

Standard deviation

WHO:

World Health Organization

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Funding

This work was supported by the Intramural Research programs of the National Human Genome Research Institute, the National Heart, Lung and Blood Institute, the Center for Cancer Research-National Cancer Institute and the National Institutes of Health Clinical Center, Bethesda, Maryland, USA.

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Authors and Affiliations

Authors

Corresponding author

Correspondence to Ashkan A. Malayeri.

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Guarantor

The scientific guarantor of this publication is Ashkan A. Malayeri.

Conflict of interest

The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.

Statistics and biometry

Rolf Symons, MD, one of the authors, has significant statistical expertise.

Informed consent

Written informed consent was obtained from all patients prior to their participation in the study.

Ethical approval

This was a prospective study approved by the institutional review board at the National Human Genome Research Institute (NHGRI).

Study subjects or cohorts overlap

Clinical aspects of 60 patients of the present cohort were previously reviewed by Estrada-Veras et al. in the paper titled “The clinical spectrum of Erdheim-Chester disease: an observational cohort study” [7].

Methodology

• observational

• single-centre

• prospective

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Mirmomen, S.M., Sirajuddin, A., Nikpanah, M. et al. Thoracic involvement in Erdheim-Chester disease: computed tomography imaging findings and their association with the BRAFV600E mutation. Eur Radiol 28, 4635–4642 (2018). https://doi.org/10.1007/s00330-018-5421-3

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  • DOI: https://doi.org/10.1007/s00330-018-5421-3

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