Erschienen in:
01.09.2020 | Breast
Can Follow-up be Avoided for Probably Benign US Masses with No Enhancement on MRI?
verfasst von:
Daly Avendano, Maria Adele Marino, Natsuko Onishi, Doris Leithner, Danny F. Martinez, Peter Gibbs, Maxine Jochelson, Katja Pinker, Elizabeth A. Morris, Elizabeth Jane Sutton
Erschienen in:
European Radiology
|
Ausgabe 2/2021
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Abstract
Objectives
To assess whether no enhancement on pre-treatment MRI can rule out malignancy of additional US mass(es) initially assessed as BI-RADS 3 or 4 in women with newly diagnosed breast cancer.
Methods
This retrospective study included consecutive women from 2010–2018 with newly diagnosed breast cancer; at least one additional breast mass (distinct from index cancer) assigned a BI-RADS 3 or 4 on US; and a bilateral contrast-enhanced breast MRI performed within 90 days of US. All malignant masses were pathologically proven; benign masses were pathologically proven or defined as showing at least 2 years of imaging stability. Incidence of malignant masses and NPV were calculated on a per-patient level using proportions and exact 95% CIs.
Results
In 230 patients with 309 additional masses, 140/309 (45%) masses did not enhance while 169/309 (55%) enhanced on MRI. Of the 140 masses seen in 105 women (mean age, 54 years; range 28–82) with no enhancement on MRI, all had adequate follow-up and 140/140 (100%) were benign, of which 89/140 (63.6%) were pathologically proven and 51/140 (36.4%) demonstrated at least 2 years of imaging stability. Pre-treatment MRI demonstrating no enhancement of US mass correlate(s) had an NPV of 100% (95% CI 96.7–100.0).
Conclusions
All BI-RADS 3 and 4 US masses with a non-enhancing correlate on pre-treatment MRI were benign. The incorporation of MRI, when ordered by the referring physician, may decrease unnecessary follow-up imaging and/or biopsy if the initial US BI-RADS assessment and management recommendation were to be retrospectively updated.
Key Points
• Of 309 BI-RADS 3 or 4 US masses with a corresponding mass on MRI, 140/309 (45%) demonstrated no enhancement whereas 169/309 (55%) demonstrated enhancement
• All masses classified as BI-RADS 3 or 4 on US without enhancement on MRI were benign
• MRI can rule out malignancy in non-enhancing US masses with an NPV of 100%