Case 34 Answer 2

No. This mass is microlobulated inferiorly, and much of the margin is indistinct (poorly defined) and obscured (by overlying breast tissue). To be "circumscribed", a mass must be well-defined (and not obscured) for at least 75% of its margin, and must lack more suspicious findings such as microlobulation and indistinct or spiculated margins.

An ultrasound was performed.