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Juvenile papillomatosis of the breast is a benign, localized proliferative condition encountered mainly in young women. We describe the contrast-enhanced MR imaging findings, including dynamic data, of a patient with histologically proven juvenile papillomatosis of the breast. The pre-contrast T1 weighted sequence showed a hypointense lobulated mass which enhanced markedly in the post-contrast images. In the dynamic sequence the lesion showed a benign enhancement profile. The most specific feature was the presence of multiple small internal cysts, best shown on the T2 weighted images. This constellation of findings should suggest juvenile papillomatosis.

20 women with suspected recurrent breast cancer who had undergone previous breast-conserving operations were investigated using dynamic contrast-enhanced gradient echo (GRE) and fat suppressed spin echo (SE) magnetic resonance (MR) imaging. Histologically confirmed recurrent tumour was readily recognized on dynamic GRE scans by virtue of rapid, early and avid enhancement. Benign scars enhanced more slowly and reached lower magnitudes of enhancement. Fat suppressed SE images, which were typically acquired 10 min after contrast administration, were sensitive for the detection of tumour recurrence but lacked specificity. Early scanning after contrast administration offers the best prospects for distinguishing tumour recurrence from benign scarring. The criteria used to distinguish these two entities are highly dependent on the scan technique and the time at which images are obtained post-contrast.