• Include these codes as defined in http://hl7.org/fhir/us/breast-radiology/CodeSystem/MarginCS

  Code	Display
  AngularMargin	Angular margin	Some or all of the margin has sharp corners, often forming acute angles. The margin of the mass is not circumscribed. Valid for the following modalities: US.
  CircumscribedMargin	Circumscribed margin	A circumscribed margin is one that is well defined, with an abrupt transition between the lesion and the surrounding tissue. For US, to describe a mass as circumscribed, its entire margin must be sharply defined. Most circumscribed lesions have round or oval shapes. [Breast Imaging Reporting and Data System—Mammography, Fifth Edition page 49] Valid for the following modalities: MG US MRI.
  IndistinctMargin	Indistinct margin	There is no clear demarcation of the entire margin, or of any portion of the margin, from the surrounding tissue. For mammography, this descriptor should not be used when the interpreting physician believes it is likely due to immediately adjacent breast tissue. Use of this descriptor usually implies a suspicious finding. [Breast Imaging Reporting and Data System—Ultrasound, Second Edition page 23] Valid for the following modalities: MG US.
  IntraductalExtension	Intraductal extension	Intraductal tumor extension is a characteristic feature of primary breast carcinoma, and is an important consideration in patients undergoing breast conservative surgery. [https://www.ncbi.nlm.nih.gov/pubmed/8630874] Valid for the following modalities: US.
  IrregularMargin	Irregular margin	Edges around the soft tissue that don't look smooth. Indicative of some sort of growth or mass rather than a cyst. Valid for the following modalities: MG US MRI.
  LobulatedMargin	Lobulated margin	The edge of the mass has broad bulges. Much like a 6 or 8 leaf clover. The edge of all of the leaves would be considered lobulated. Valid for the following modalities: US.
  MacrolobulatedMargin	Macrolobulated margin	Smooth margin with distinct separation between the mass and the surrounding border. Macrolobulaed margins are oval-shaped and have a wide rather than tall formation. Valid for the following modalities: MG.
  MicrolobulatedMargin	Microlobulated margin	The margin is characterized by short-cycle undulations or scalloped appearance,and the margin of the mass is not circumscribed. [Breast Imaging Reporting and Data System—Mammography, Fifth Edition page 54] Valid for the following modalities: MG US.
  NonCircumscribedMargin	Non circumscribed margin	The mass has one or more of the following features: indistinct, angular, microlobulated, or spiculated in any portion of the margin There is not a clear demarcation between the mass and the surrounding tissue. [Breast Imaging Reporting and Data System—Mammography, Fifth Edition page 153] Valid for the following modalities: US MRI.
  ObscuredMagin	Obscured magin	It is hidden by superimposed or adjacent fibroglandular tissue. This is used primarily when some of the margin of the mass is circumscribed, but the rest (more than 25%) is hidden. Valid for the following modalities: MG.
  SmoothMargin	Smooth margin	The edges of the mass have a smooth appearance and distinct separation between the mass and surrounding tissue. Valid for the following modalities: US MRI.
  SpiculatedMargin	Spiculated margin	The margin is characterized by sharp lines radiating from the mass, often a sign of malignancy, but the significant feature is that the margin of the mass is not circumscribed. [Breast Imaging Reporting and Data System—Mammography, Fifth Edition page 55] Valid for the following modalities: MG US MRI.

This value set contains 12 concepts

Expansion based on http://hl7.org/fhir/us/breast-radiology/CodeSystem/MarginCS version 0.2.0

All codes from system http://hl7.org/fhir/us/breast-radiology/CodeSystem/MarginCS