Case 54 Answer

BI-RADS 4, Suspicious. This is a hard one, because this isoechoic well defined round mass certainly does not look like a cancer. However, it is solid and palpable, which implies that is is new. Men don't usually get fibroadenomas and other benign breast disease. There is no data on using "probably benign" for men with palpable masses.

 

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An ultrasound-guided biopsy was performed... yielding...
Myofibroblastoma

Myofibroblastomas are rare benign tumors which are more common in men than women. They do not require surgical excision.

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