This case-insensitive code system http://hl7.org/fhir/us/breast-radiology/CodeSystem/ObservationCodesCS defines the following codes:

Code	Display	Definition
abnormalityFibroadenomaObservation	Abnormality Fibroadenoma observation	Observation.code to identify a Fibroadenoma observation.
abnormalityArchitecturalDistortionObservation	Abnormality Architectural Distortion observation	Observation.code to identify an MGAbnormalityArchitecturalDistortion observation.
consistentWithObservation	Consistent With observation	Observation.code to identify a ConsistentWith observation.
tumorSatelliteObservation	Tumor Satellite observation	Observation.code to identify a TumorSatellite observation.
abnormalityDuctObservation	Abnormality Duct observation	Observation.code to identify an ObservationCodeAbnormalityDuct observation.
abnormalityForeignObjectObservation	Abnormality Foreign Object observation	Observation.code to identify an AbnormalityForeignObject observation.
abnormalityLymphNodeObservation	Abnormality Lymph Node observation	Observation.code to identify an AbnormalityLymphNode observation.
abnormalitySkinLesionObservation	Abnormality Skin Lesion observation	Observation.code to identify an AbnormalitySkinLesion observation.
abnormalityAsymmetryObservation	MG Abnormality Asymmetry observation	Observation.code to identify an MGAbnormalityAsymmetry observation.
abnormalityDensityObservation	MG Abnormality Density observation	Observation.code to identify an MGAbnormalityDensity observation.
abnormalityFatNecrosisObservation	MG Abnormality FatNecrosis observation	Observation.code to identify an MGAbnormalityFatNecrosis observation.
findingsLeftBreastObservation	Findings Left Breast observation	Observation.code to identify a SectionFindingsLeftBreast observation.
findingsRightBreastObservation	Findings Right Breast observation	Observation.code to identify a SectionFindingsRightBreast observation.
findingsBiLateralBreastObservation	Findings BiLateral Breast observation	Observation.code to identify a SectionFindingsBiLateralBreast observation.
mgFindingObservation	Mammography Findings observation	Observation.code to identify a Mammography Findings observation.
nmFindingObservation	Nuclear Medicine Findings observation	Observation.code to identify a Nuclear Medicine Findings observation.
mriFindingObservation	Magnetic Resonance Imaging Findings observation	Observation.code to identify a Magnetic Resonance Imaging Findings observation.
usFindingObservation	Ultrasound Findings observation	Observation.code to identify a Ultrasound Imaging Findings observation.
otherModalityFindingObservation	Other Modality Findings observation	Observation.code to identify an Other Modality Findings observation.