GAMUT I-3
HALO SIGN OR CAPSULE AROUND THE PERIPHERY OF A BREAST LESION


COMMON
1. Cyst 
2. Fibroadenoma
3. Fibrocystic change  (solid nodule)
4. Mole or skin tag (halo usually incomplete)
5. Sebaceous cyst


UNCOMMON
1. Carcinoma (intracystic, medullary, papillary)
2. Fibroadenolipoma (hamartoma) 





References