Inflammatory breast cancer: MR imaging findings

Area of Science:

• Radiology
• Oncology
• Medical Imaging

Background:

• Inflammatory breast cancer (IBC) is an aggressive form of breast cancer.
• Early and accurate diagnosis is crucial for effective treatment and improved patient outcomes.
• Magnetic resonance (MR) imaging offers detailed visualization of breast tissue and potential abnormalities.

Purpose of the Study:

• To describe the characteristic magnetic resonance (MR) imaging features of primary inflammatory breast cancer (IBC).
• To correlate MR findings with pathological diagnoses of IBC.
• To identify imaging patterns that can aid in the diagnosis of IBC.

Main Methods:

• Retrospective review of MR examinations from 14 patients with pathologically confirmed IBC.
• Assessment of imaging features including skin thickening, edema, nipple changes, architectural distortion, parenchymal and cutaneous enhancement patterns, lymphadenopathy, and pectoral muscle involvement by two radiologists.
• Analysis of enhancement kinetics over time.

Main Results:

• Common MR findings included skin thickening (58%), edema (64%), architectural distortion (58%), non-mass-like enhancement (64%) with washout kinetics (86%), and axillary lymphadenopathy (86%).
• Less frequent findings were nipple retraction (14%), mass-like enhancement (36%), and internal mammary lymphadenopathy (14%).
• Additional findings included prepectoral fluid (28%) and hypertrophic internal mammary artery (21%).

Conclusions:

• The most characteristic MR imaging findings for IBC are skin thickening, edema, architectural distortion, mass-like enhancement with washout kinetics, and axillary lymphadenopathy.
• Nipple retraction and internal mammary lymphadenopathy are less common but significant findings.
• Prepectoral fluid is a frequent observation but does not indicate tumor infiltration.