- Most common benign tumor
- Adult and juvenile form
- Contains stromal and epithelial element
- Well circumscribed, oval lesions with edge shadowing, posterior enhancement on ultrasound, wide than tall. Hypermobile under the ultrasound probe
- Isointense to breast in T2 and can be seen to rapidly enhance post i.v. contrast administration
- Calcifications are commonly seen, causing edge shadowing
- Pseudocapsule due to compression of adjacent parenchyma