Well-Circumscribed Lesions on Mammography

Breast cancers that can appear as well-circumscribed masses on mammography include:

• Medullary carcinoma:
• Mucinous carcinoma:
• Papillary carcinoma: Intraductal or intracystic
• Invasive ductal carcinoma:
• Ductal carcinoma in situ:
• Primary lymphoma:
• Metastasis:
• Phyllodes tumor: Benign or malignant
• Sarcoma of breast:

These usually turn out not to be completely well-circumscribed on magnification views.

References

Gamuts in Radiology - Reeder and Felson - 4th ed (Springer, 2003).