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Case number:	172
Age:	70
Clinical presentation:	Postmenopausal woman with history of right breast cancer and who had undergone right MRM presented for annual surveillance. On examination, no abnormality was detected in the left breast.

Mammography:

Breast composition:	ACR category b (there are scattered areas of fibroglandular density)
Mammography features:
‣ Location of the lesion:	Left breast, typically benign rim calcifications seen in diffuse distribution
‣ Mass:
• Number:	0
• Size:	No mass
• Shape:	None
• Margins:	None
• Density:	None
‣ Calcifications:
• Typically benign:	Rim
• Suspicious:	None
• Distribution:	Diffuse
‣ Architectural distortion:	None
‣ Asymmetry:	None
‣ Intramammary node:	None
‣ Skin lesion:	None
‣ Solitary dilated duct:	None
‣ Associated features:	None

BI-RADS:

BI-RADS Category: 2 (benign)

Case summary:

Postmenopausal woman who had undergone surgery for right breast cancer presented for annual surveillance. Diagnosed as typically benign rim calcifications in diffuse distribution in left breast, BI-RADS 2 on imaging.

Learning points:

Long-standing oil cysts in the breast show eggshell rim calcification on mammography, which is a feature that is not seen in simple or complex breast cysts. Oil cysts are benign lesions caused by fat necrosis, either as a result of injury, surgery, or radiation.