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- Liquefied fat
- Can be seen in any part of breast
- Most common in subareolar region
- Range from few mm to cm in size
Mammography
- Oval to round lucent smooth border lesion
- Develops rim calcification over time
- Calcification can be rim, egg-shell or coarse
- In early stages, same as surrounding fat and difficult to detect
Ultrasound
- Myriad of echogenicity – hyper, iso or hypo
- Can appear solid when inspissated fat present
- Sometimes can appear complex with mural nodules, septae
CT
- Calcified well circumscribed
- No enhancement
MRI
- T1 hyperintense
- Faint rim enhancement post Gd