Value of Apparent Diffusion Coefficient Values in Differentiating Malignant and Benign Breast Lesions

Area of Science:

• Radiology
• Oncology
• Medical Imaging

Background:

• Magnetic resonance imaging (MRI) is a key tool for breast examinations.
• Diffusion-weighted imaging (DWI) enhances conventional MRI by providing additional diagnostic information.
• Differentiating benign from malignant breast lesions remains a clinical challenge.

Purpose of the Study:

• To evaluate the impact of apparent diffusion coefficient (ADC) values derived from DWI in distinguishing between benign and malignant breast lesions.
• To assess the diagnostic accuracy of ADC values in conjunction with conventional MRI sequences.

Main Methods:

• A diagnostic accuracy study involving 46 women with 58 breast masses (35 malignant, 23 benign).
• Lesions were examined using a 1.5 T clinical MRI scanner, assessing morphologic characteristics and contrast uptake.
• Apparent diffusion coefficient (ADC) values were measured and statistically compared with histopathologic results.

Main Results:

• Mean ADC values were significantly lower in malignant lesions (1.04±0.29×10⁻³ cm²/sec) compared to benign lesions (1.61±0.50×10⁻³ cm²/sec) (p=0.03).
• Receiver operating characteristic analysis identified a cut-off ADC value of 1.30×10⁻³ mm²/sec, achieving 89.1% sensitivity and 100% specificity for differentiating lesion types.
• Conventional MRI sequences showed varying sensitivity and specificity for lesion characterization.

Conclusions:

• Apparent diffusion coefficient (ADC) values significantly enhance the diagnostic accuracy of conventional MRI for solid breast lesions.
• Diffusion-weighted imaging (DWI) should be integrated into routine breast MRI protocols for improved diagnostic performance.
• ADC measurements offer a valuable quantitative method for breast lesion characterization.