Slide 84.Fibroadenoma, Breast

A. Brief Descriptions

  1. Most common benign tumor of the female breast.

  2. Frequently multiple and bilateral and occur in the upper outer quadrant.

  3. A  new growth compose of both fibrous and glandular tissue.

B. Gross Findings

1.    Grow as a spherical nodule which is usually well-circumscribed and freely movable.

2.    Vary in size from less than 1 cm to giant forms 10 to 15 cm in diameter.

C. Micro Findings:

  1. A well circumscribed nodule with fibrous capsule.

  2. Proliferation of both duct and periductal connective tissue.

  3. Connective tissue: fibromyxomatous stroma

  4. Duct: 2 growth pattern:

D. Others:

 1.Compare with slide 85, phyllodes timor of breast.

E. Reference

  1. Robbins Pathologic Basis of Disease, 6th ed.  P.1102-1103.




Fig. 84-1 (LP)Multiple fibroadenoma with fibrous capsule.




Fig. 84-2 (LP)Proliferation of both duct and periductal fibromyxomatous stroma.Note the intracanalicular pattern of slit-like duct.



Fig. 84-3 (LP)Pericanalicular pattern: the duct with round or oval duct.