Breast Flashcards
Breast Borders
- sup: inferior clavicle
- inf: 2 cm below inf-mamm fold
- lat: mid-axillary line
- medial: mid-sternum
DCIS subtypes, low, high grade
Subtypes:
Lower grade: papillary, cribiform
Higher grade: solid, comedo
Breast Screening mammo
Screening mammo:
(USPSTF) -every 2 years, age 50-74 individualized decision 40-49
American Cancer Society: 40 individualized, 45-74 annual
** For hx of thoracic RT at age 10-30: annual mammogram and/or MRI yearly starting 8 years after RT or age 40 (whichever earlier)
Screening MRI who needs it
Screening MRI for: (ACS) •Lifetime risk > 20% •Known BRCA + •1st degree relative BRCA+ with pt status unknown •PTEN/p53 mutation
Types of Mastectomy:
Types of Mastectomy:
- Radical: pec major/minor Levels I, II & III
- MRM: Level I & II
- Total: breast Only (only used for prophy, DCIS)
- Skin Sparing: biopsy scar, skin over tumor, breast parenchyma, and typically also remove NAC (nipple areolar complex)
Supraclav borders
Cranial: Cricoid Caudal: Caudal edge of clavicle Anterior: SCM Posterior: Scalene Muscle Lateral: lateral SCM Medial: Thyroid/Trachea
Axillary lvl I borders
Cranial: Ax vessels cross lateral edge of Pec Min Caudal: Pec major insert on ribs Anterior: Ant surface of Pec Maj to Lat Posterior: Subscapularis Muscle Lateral: Lat Medial: Pec minor
Axillary lvl II borders
Cranial: Ax vessels cross medial edge of Pec Min
Caudal: Ax vessels cross lateral edge of Pec Min
Anterior: Ant surface Pec Minor
Posterior: Ribs
Lateral: Lat Pec Minor
Medial: Med Pec Minor
Axillary lvl III borders
Cranial: Coracoid Process Caudal: Ax vessels cross medial edge of Pec Min Anterior: Pec Major Posterior: Ribs Lateral: Medial edge Pec Minor Medial: Thoracic Inlet
IMN borders
Cranial: Cranial 1st rib
Caudal: Cranial 4th rib
Luminal A:
Luminal A: ER+/HER2-, low grade
Luminal B:
Luminal B: ER+/H2N- or +, high grade
Basal:
Basal: triple negative
Her2-like:
Her2-like: ER-, Her2+
Her2 pos defined as:
•IHC 3+ (2+ equivocal)
•FISH amplification of ≥ 2.0
Extensive intraductal component (EIC):
Extensive intraductal component (EIC): DCIS > 25% of IDC specimen
Want to know from pathologist:
Want to know from pathologist:
- Size
- Grade
- LVI
- Margins
- EIC
- LNs (and ECE)
- Receptors
- Oncotype Dx
Pec invasion vs true CW invasion:
Pec invasion vs true CW invasion: if on flexing, the mass is fixed but on relaxing it’s movable - then it’s pec only. If true CW invasion it’s always fixed
IMN involvement %’s
if lateral primary and -ALNs
if +ALNs or medial primary
if both medial primary and +ALNs
IMN involvement
- 5% if lateral primary and -ALNs
- 15-20% if +ALNs or medial primary
- 30-40% if both medial primary and +ALNs
=> usually limited to first 3 intercostal spaces
CC View
CC: shows lat vs. medial
- should show nipple
- marker on lateral side
MLO view
MLO: shows sup vs. inf
- need to see pec maj on film down to level of nipple
- includes axillary tail
- if abnlty, get b/l dx mam
BIRADS:
BIRADS: breast imaging reporting and data system (0-6):
0: incomplete - additional imaging needed
1: negative – routine screening
2: benign – routine screening
3: probably benign - 6 month follow-up (<2% risk)
4: suspicious - biopsy (3-95% risk)
5: highly suggestive of malignancy - biopsy (>95% risk)
6: known malignancy
Breast history/Physcial
History: prior mammos, pain, nipple discharge, gyn hx (PG status, age menarche, first brith, age menopause, OCPs, HRT), Ashkenazi,
-Physical: bilateral, bipositional (supine and sitting) breast exam, nodes
Workup
- Imaging:
- diagnostic mammo and ultrasound
- spot compression for mass
- magnified view for calcs
- Biopsy:
- Core biopsy: stereotactic (see on mammogram) vs US guide (see on ultrasound); leave clip
- FNA any clinically positive nodes
- Determine receptor status
Systemic w/u (symptoms, N+, Stage IIIA+):
- CT C/A/P
- bone scan or PET/CT
When Genetic referral:
Genetic referral: - Both breast and ovarian primaries - Family member with BRCA - Any breast CA <50 - Triple neg any age - Multiple breast primaries - Breast CA in pt and then cancer in family (>1 relative breast <50 or any age ovarian, >2 relative with breast, prostate, or pancreatic cancer) - Ashkenazi Jew - Male breast CA (Consider p53, ATM testing if BRCA negative)
When to get MRI for workup
MRI for:
- extremely dense breast tissue
- ILC
- assessing feasibility of breast conservation
- before NACT
- unknown primary
TNM
Tis: DCIS, LCIS, pagets
T1mic: ≤ 1mm T1a: 1-5 mm T1b: > 5-10 mm T1c: > 10-20 mm T2: > 2-5 cm T3: > 5 cm T4: T4a: chest wall not including pec T4b: •skin •edema •ulceration •skin nodules or peau d’orange T4c: T4a and b T4d: inflammatory
cN1: moveable cN2a: fixed cN2b: IMN only cN3a: infraclav (III) cN3b: IMN and axilla cN3c: supraclav
cM0(i+) – circulating metastatic tumor cells in blood or found in other tissue < 0.2mm