Abbreviated Breast MRI Demonstrates Promising Diagnostic Performance
Abbreviated breast MRI may support the emerging landscape of personalized breast cancer management
Abbreviated MRI can serve as a time-efficient alternative for assessing the response to neoadjuvant chemotherapy (NAC), demonstrating diagnostic performance comparable to full protocol MRI.
NAC is a standard approach for treating locally advanced breast cancer and is increasingly used for treating smaller tumors. Following NAC, full-protocol MRI is used to assess treatment response and inform surgical planning.
Full-protocol MRI includes various and multiple sequences performed before and after contrast injection. Although it can incur acquisition times of approximately 15-20 minutes per scan, interpretation is more time-consuming and generates much larger image datasets compared with abbreviated MRI.
“These studies are, in many ways, among the most straightforward MRI examinations we perform,” said Roberto Lo Gullo, MD, from the Department of Radiology at Columbia University, Vagelos College of Physicians and Surgeons in New York City. “We are essentially trying to determine whether the cancer has resolved, decreased, remained stable or progressed.”
Despite the simplicity of the diagnostic task, full protocol MRI remains a relatively time- and resource-intensive exam. “I began wondering whether a full diagnostic MRI protocol was truly necessary to answer such a focused clinical question, or whether a shorter protocol could provide the same information,” Dr. Lo Gullo said.
Abbreviated MRI scans typically take less than 10 minutes, with shorter interpretation times due to smaller image datasets. These scans can have varying protocols and sequences.
“The original abbreviated MRI protocol proposed by Dr. Christiane Kuhl, chair of the Department of Radiology at RWTH Aachen University in Germany, consists primarily of one pre-contrast T1-weighted sequence and one postcontrast T1-weighted sequence with subtraction images,” Dr. Lo Gullo said. “Our protocol includes a T2-weighted sequence to increase specificity by helping characterize small T2-bright benign lesions and potentially reducing unnecessary biopsies.”
However, the diagnostic performance of abbreviated MRI in comparison to full protocol MRI had yet to be studied across a large cohort of breast cancer patients. “If reliable, abbreviated MRI may have the potential to help radiologists interpret more studies, improve workflow efficiency and reduce patient wait times by increasing scanner availability,” Dr. Lo Gullo said.
Testing the Performance of Abbreviated MRI
In this retrospective, single-center study that included 478 female patients with breast cancer patients, Dr. Lo Gullo and colleagues performed full-protocol MRI post-NAC to assess treatment response. Abbreviated MRI was derived from the same dataset. Acquisition times were 15 and 7.5 minutes, respectively.
Three readers interpreted the scans across two sessions: abbreviated MRI first, followed by full-protocol MRI after a four-week washout period. Each reading included classification of the treatment response, recording of the interpretation time and measurement of residual disease.
To understand how the streamlined approach performs in practice, the team calculated and compared key diagnostic metrics between abbreviated and full-protocol MRI. They examined differences between reported and pathologic tumor size to assess over- or underestimation of residual disease.
Median interpretation times in the study were 39-44 seconds for abbreviated MRI, and 42-64 seconds for full-protocol MRI scan analyses, respectively. These times reflected the readers’ focused assessment of treatment response, not the entire exam. They did not include lymph node evaluation, metastatic assessment or report preparation. The authors found no differences between abbreviated and full-protocol MRI in four of the five metrics, with specificity differing by approximately 3%.
“If imaging begins to play a larger role in deciding whether surgery can safely be avoided, then full-protocol MRI may remain preferable in some cases,” Dr. Lo Gullo said. “That said, radiologists’ familiarity with abbreviated MRI protocols and a better understanding of their limitations could potentially narrow this specificity gap over time.”
Researchers also found a moderate to strong correlation between MRI tumor size measurements and pathologic tumor size, with both MRI protocols yielding slight overestimations; however, these size differences were not clinically significant.
Dr. Lo Gullo noted that overall, the findings support the use of abbreviated MRI for response classification and residual tumor estimation. “Reducing scan time alone can have a meaningful impact on patients,” Dr. Lo Gullo said. “For many individuals undergoing MRI after neoadjuvant chemotherapy, this examination carries enormous emotional weight.”
“Abbreviated MRI may also reduce costs for patients paying out of pocket,” Dr. Lo Gullo continued. “Insurance coverage for abbreviated breast MRI remains an evolving topic, but demonstrating its clinical reliability is an important step toward broader adoption and reimbursement.”
The approach may have key implications for clinical practice. “Increasing the number of available MRI slots could help reduce wait lists for patients needing breast MRI examinations,” Dr. Lo Gullo said. “Shorter protocols also reduce the number of sequences radiologists need to review, decreasing interpretation burden and potentially reducing fatigue.”
Necessary Testing Before Potential Implementation
Looking ahead, Dr. Lo Gullo emphasized that the limitations of the study must be considered as well. “The next step would ideally be a prospective study in which patients are randomized to undergo either abbreviated MRI or full-protocol MRI after treatment.” Dr. Lo Gullo said. “This would allow us not only to evaluate diagnostic performance but also patient satisfaction, levels of anxiety or discomfort, motion artifacts, workflow efficiency and cost differences between the two approaches.”
More broadly, experts note that abbreviated MRI protocols may pose challenges in certain clinical scenarios beyond post-NAC response assessment. “As oncologic treatments evolve with newer agents, how such agents affect contrast uptake on MRI remains unknown,” said Priscilla J. Slanetz, MD, MPH, from the Department of Radiology at the Geisel School of Medicine at Dartmouth in Hanover, NH. “Abbreviated protocols carry the potential risk of missing lower grade malignancies, such as DCIS and invasive lobular carcinoma, as these may only be detected on delayed imaging.”
Another critical patient population to assess are those undergoing de-escalation therapy such as surgery. “There is interest in potentially avoiding surgery in patients with pathologic complete response, so some very preliminary studies are comparing percutaneous re-biopsy of the tumor site in select patients with imaging complete response following NAT and comparing biopsy results with surgery,” said Eren D. Yeh, MD, from the Department of Radiology at Brigham and Women’s Hospital at Harvard Medical School in Boston.
Drs. Slanetz and Yeh coauthored a related Radiology commentary accompanying the study. They note that practical limitations may exist, including limited MRI availability in rural and lower-resource settings and potential financial barriers, including reimbursement disparities, that could affect access for some patients. “Most of these locations do not have access to MRI as the magnets are generally located in more urban locations,” Dr. Slanetz said.
While questions remain regarding applications for abbreviated MRI, the study presents a potential alternative to the one-size-fits all approach for post-NAC imaging and monitoring.
“Once ultrafast imaging becomes more mainstream, I suspect that nearly all patients undergoing MRI will benefit,” Dr. Slanetz said. “Imaging protocols will likely become much shorter, as we know that early enhancement in the first minute helps us to differentiate benign from cancerous lesions more accurately.”
At the patient level, this evolution could have important implications. “Post-NAC MRI results influence prognosis, surgical planning and future treatment decisions.” Dr. Lo Gullo said. “Therefore, there is substantial motivation to continue optimizing breast MRI protocols for specific patients and indications.”
For More Information
Access the Radiology study, “Abbreviated MRI for the Evaluation of Treatment Response in Patients Undergoing Neoadjuvant Chemotherapy for Breast Cancer,” and the related editorial, “Abbreviated Breast MRI Protocols to Monitor Response to Chemotherapy.”
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