Table 1.

Summary of selected fat necrosis imaging features

Imaging Modality	Benign	Suspicious findings
Mammography	Oil cyst Rim calcifications Dystrophic calcifications	Irregular, spiculated mass Architectural distortion Coarse heterogeneous Pleomorphic
Ultrasound	Echogenic band within an oil cyst Echogenic mass in the superficial plane of the breast	Irregular mass Hypoechoic masses with posterior acoustic shadowing Complex cystic and solid masses
Breast MRI	Round or oval masses hyperintense on T1 Black Hole sign on STIR sequence	Irregular enhancing masses Thick and Irregular rim enhancing masses
PET-CT		Hypermetabolic lesion

PET-CT, positron emission tomography-CT. STIR, short time inversion recovery.