GAMUT I-2
WELL-DEFINED OR CIRCUMSCRIBED LESION OF THE BREAST


COMMON
1. Carcinoma, usually not "well" circumscribed on magnification views (eg, ductal in situ; invasive ductal; medullary; colloid or mucinous ; papillary; intracystic papillary)
*2. Cyst 
*3. Fibroadenoma 
*4. Fibrocystic change  (esp. sclerosing adenosis)
5. Intramammary (or axillary) lymph node
6. [Normal variant (circumscribed parenchyma of puberty; retracted or normal nipple out of profile ; end-on vein)]
7. Oil or lipid cyst (posttraumatic  or postsurgical fat necrosis)
*8. Papilloma (intraductal)  
*9. [Skin lesion (eg, mole; wart; neurofibroma ; epidermal inclusion or sebaceous cyst)]


UNCOMMON
1. Abscess
*2. Fibroadenolipoma (hamartoma) 
3. Galactocele
4. Granular cell myoblastoma
5. Hemangioma (cavernous) 
6. Hematoma
7. Lipoma  
8. Lymphoma, primary
*9. Metastasis to breast (eg, from melanoma; carcinoma of lung, ovary, GI or GU tract; lymphoma G; sarcoma)
10. Phyllodes tumor   (formerly cystosarcoma phyllodes; giant fibroadenoma)
11. Pseudoangiomatous stromal hyperplasia (PASH)
12. Sarcoma of breast (eg, angiosarcoma)
*13. [Silicone or paraffin globule or implant artifact]


* May be multiple.

[    ] This condition does not actually cause the gamuted imaging finding, but can produce imaging changes that simulate it.




References