J Korean Radiol Soc.
1995 Sep;33(3):449-456.
Dynamic MRI of Breast Fibroadenoma: Pathologic Correlation
Abstract
- PURPOSE
To analyze the dynamic MR imaging of breast fibroadenoma according to the histologic type for
differentiation from breast carcinoma.
MATERIALS AND METHODS
Dynamic MR images of 26 lesions from 22 breasts in 19 patients showing atypical
clinical features or film mammogram and ultrasound manifestations were performed. We analyzed the speed
and the maximal amount of contrast enhancement and the patterns, such as shape, border, and internal signal
intensity, among the histologic types during five minutes after contrast injection.
RESULTS
The speed and maximal amount of contrast enhancement of fibroadenoma were in descending order
of myxoid, sclerotic, glandular, and calcified types. Among these, the value of maximal amount of contrast
enhancement of myxoid and sclerotic type were more than 700 NU, but only myxoid type was enhanced more
than 700NU within the first 1 minute after contrast injection, similar to the findings of carcinoma. In general,
fibroadenoma showed the tendency of smooth surface(69%), well-defined border(88%) with safety rim, and
internal homogeneous signal intensity(65%). However, sclerotic type of fibroadenoma had relatively high incidence
of heterogeneous internal signal intensity(78%) after Gd-DTPA injection.
CONCLUSION
Dynamic MR imaging of atypical breast fibroadenoma mimicking breast malignancy was very
useful in differentiation it from carcinoma and had the benefit of classifying fibroadenoma according to its
histologic types.