Fig. 7

Example of MRI finding of breast lesion classified as BIRADS 4A by echography. A 26-years-old patient with a giant fibroadenoma at the left breast without suspicious contrast enhancement and size stability compared to previous ultrasound studies. At the right breast, a mass with lobulated contours, hypointense on the T1W sequence (a), which shows hyperintensity to the glandular parenchyma on the T2 sequence (b), and an ADC (c) of 1.8 × 10⁻³mm²/s. Postcontrast subtraction images show a contrast enhancement that describes an ascending and plateau uptake from initial (d) to delayed (e) subtractions, with rapid enhancement (f). It presented characteristics of fibroadenoma; however, as it has shown a size increase compared to previous ultrasonography studies, histological analysis was required, resulting in a pericanalicular fibroadenoma