Flashcards in Normal breast and Benign disease Deck (39)
Where does the majority of the breast cancer spread to?
Where do cancers that arise on the medial aspect of the breast spread to?
functional unit of the breast
- what does it branch into?
terminal duct unit (smallest branch)
- stops branching into more ducts, but ends up in a cluster of small tubules (acini) and becomes the terminal duct lobular unit
- area where most of the changes occur that can malignant or premalignant
What area of the breast does the majority of malignant or premalignant changes occur?
Terminal duct lobular unit
The entire ductal system is lined by?
Two cell layers
1. Outer: myoepithelial layer - contractile properties important in propelling milk in lumen, and supports inner layer
- in case of malignancy, myoepithelial layer is lost
2. Inner: epithelial layer - production of milk - single cuboidal epithelium
- any change in two cell layer is pathological
Difference between stroma lining the terminal duct lobular unit and the stroma between the lobules
specialized stroma (also fibrous) that is hormone responsive
regular fibrous tissue liek any where else in body
Diff between male and female breast?
Same until puberty
- then females develop lobules (+ TDLU)
- both have ducts and stroma
At puberty, what stimulates the lobules to grow?
E + P
- formation of actual lobules occur
During the menstrual cycle, what happens to breast development?
Increased size/nodularity of lobules
What happens to breasts during pregnancy?
Maximum stimulation with hormones:
1. epithelial vacuolization
- LOTS more acini
Entire lobule increases in size
2. secretion in lumina
- Epithelial cells start increasing milk prod.
- Continues to be in this state during lactation and regresses when finished
What happens to breast tissue during menopause?
Involution of TDLUs
Duct system remains
Decrease in interlobular stroma
More fatty tissue comes in
Sites of ectopic breast tissue
Usually along midline (during development of fetus)
- most prominant is in the axilla
doesnt stay in nl range
- results in really large breasts --> discomfort
In gynecomastia, what proliferates?
mostly the stroma
1. acute mastitis
2. chronic mastitis
3. periductal mastitis
4. fat necrosis
young female - common in lactating breast
Cracked or inflammed nipple allows entry of staph and grows in milk in ducts
--> neutrophils come in -->
* can resemble cancer
Nonbacterial inflammation due to duct obstruction
Dilation of duct (duct ectasia)
PLasma cell mastitis
Healing by fibrosis
(aka recurrent subareolar abscess, squamous metaplasia of lactiferous ducts, Zuska disease)
recurrent subareolar abcess
Painful erythematous subareolar mass
- 90% are smokers
- instead of having the double layered cuboidal epithelium, the outer squamous cells advance into the ducts
- Benign or malignant?
Caused by ischemia or trauma
Ill defined palpable mass - mimics carcinoma
early: necrotic fat cells, neutrophils
later: macrophages, glycoproteins, fibrosis Ca2+
Benign neoplasms o the breast
1. Fibroadenoma (most common
2. Lactating adenoma
3. Phyllodes tumor
4. (Intraductal) Papillloma
derived from TDLU
- very well circumscribed
- terminal ducts become squished by fibrous tissue
- NOT proliferating
presents in pregnancy or lactation
- assoc. w/ rapid increase in size during pregnancy
soft circumscribed mass
Small tubular structure with lactational changes
large fleshy tumors
"leaflike projections" into cystic spaces
Spectrum: benign --> high grade
Most common in 5th decade
- some can become malignant
Which if the benign breast tumors can become malignant?
benign, 1 cm, subareolar (beneath areola) - papillary mass in large duct
Bloody nipple discharge (rule out carcinoma)
- Menopause FX
Most common disorder/change in breasts
Decreases progressively after menopause.
Asymptomatic, pain, nodularity
Can be innocuous to pre-malignant
2. ductal hyperplasia
3. apocrine metaplasia
(NO CHRONIC MASTITIS)
3 types of fibrocystic change
1. Nonproliferative FCC
- epith hyperplasia ABSENT
2. Proliferative FCC
- epith hyperplasia present
3. Sclerosing adenosis
- marked fibrosis --> compress/distorts lumens of acini/ducts
- hard rubbery like Ca
Two types of proliferative fibrocystic disease (has epithelial hyperplasia)
1. lobular hyperplasia (acinar epithelium)
- atypical lobular hyperplasia
- LCIS (lobular Ca in situ)
2. Ductal hyperplasia (terminal duct)
- Usual hyperplasia
- atypical ductal hyperplasia
- DCIS (Ductal Ca in situ)
Lobular carcinoma in situ (LCIS)
increased risk of breast cancer on both sides
- both lobular and ductal carcinoma
Breast pathology with minimal/no risk of breast carcinoma
1. Fibroadenoma W/O complex feat
3. duct ectasia
4. apocrine metaplasia
5. mild hyperplasia