RIM ENHANCEMENT

• Enhancement is more pronounced at the periphery of the mass
• If seen in a solid mass -> suspicious for IDC
• Cysts can enhance peripherally but are also bright on T2 sequence (i.e. inflammatory cyst)
• Fat necrosis may have rim enhancement but centrally has low signal, lower than that of the surrounding fat (“black hole”)

Related Radiology Article: Macura KJ, Ouwerkerk R, Jacobs MA, Bluemke DA. Patterns of enhancement on breast MR images: interpretation and imaging pitfalls. Radiographics. 2006 Nov;26(6):1719-34.