TCP - Breast Conditions

What is the primary route for breast cancer metastasis?

Lymphatic drainage is the primary route for breast cancer metastasis.

Why does lymphatic drainage of the breast matter clinically?

It is the primary route for breast cancer metastasis; It determines clinical staging, especially N stage; * It guides sentinel lymph node biopsy (SLNB) and axillary lymph node dissection (ALND).

What percentage of breast lymphatic drainage most commonly goes to the axillary nodes?

Approximately 75% of breast lymphatic drainage goes to the axillary nodes.

Which lymph nodes are the most common drainage site for the breast?

The axillary lymph nodes are the most common drainage site.

Where are Level 1 axillary lymph nodes located?

Level 1 axillary lymph nodes are lateral and inferior to the pectoralis minor.

Where are Level 2 axillary lymph nodes located?

Level 2 axillary lymph nodes are posterior to the pectoralis minor.

Where are Level 3 axillary lymph nodes located?

Level 3 axillary lymph nodes are medial/superior to the pectoralis minor.

What percentage of breast lymphatic drainage goes to the internal mammary nodes?

Approximately 20% of breast lymphatic drainage goes to the internal mammary nodes.

Where are the internal mammary nodes located?

The internal mammary nodes are located along the internal mammary vessels.

Which breast tumors are more likely to involve internal mammary lymph nodes?

Medial breast tumors are more likely to involve internal mammary lymph nodes.

What are supraclavicular and infraclavicular nodes in breast lymphatic drainage?

They are secondary drainage pathways.

What does supraclavicular or infraclavicular lymph node involvement suggest in breast disease?

Involvement suggests more advanced nodal disease.

What percentage of breast lymphatic drainage goes to the contralateral breast and abdominal nodes?

Less than 5% of breast lymphatic drainage goes to the contralateral breast and abdominal nodes.

When can drainage to contralateral breast or abdominal nodes occur?

It is less common and may occur with advanced disease.

Which breast quadrant tumors most commonly metastasize to axillary lymph nodes?

Upper outer quadrant tumors most commonly metastasize to axillary lymph nodes.

Which breast tumors have a greater likelihood of internal mammary node involvement?

Medial breast tumors have a greater likelihood of internal mammary node involvement.

Why are positive lymph nodes important in breast cancer?

Positive lymph nodes are one of the strongest predictors of prognosis and adjuvant therapy.

What is mastitis?

Mastitis is inflammation of the breast.

Who usually develops mastitis according to the presentation?

Mastitis usually occurs in breastfeeding or lactating women.

What is the pathogenesis of mastitis according to the presentation?

The pathogenesis is unknown or poorly understood, but milk stasis, ductal narrowing, and nipple trauma are listed contributors.

What organism is the most common infectious cause of mastitis?

Staphylococcus aureus is the most common infectious cause of mastitis.

What is the typical presentation of infectious mastitis?

Unilateral breast pain; Warmth; Erythema; Tenderness; Swelling; May have flu-like symptoms.

How does infectious mastitis usually differ from congestive mastitis in laterality?

Infectious mastitis is usually unilateral, while congestive mastitis is usually bilateral.

What is the supportive treatment for infectious mastitis?

Warm compresses; Continue breastfeeding or pumping.

Should a patient with mastitis continue breastfeeding or pumping?

Yes. The presentation states to continue breastfeeding or pumping.

What antibiotic is listed for infectious mastitis?

Dicloxacillin is listed as an antibiotic option.

What are the clinical features of congestive mastitis?

Congestive mastitis presents with bilateral breast pain and swelling.

What is the treatment for congestive mastitis?

Supportive care; NSAIDs; Tylenol; Lactation specialist consult.

When should ultrasound be considered in mastitis?

If there is no improvement in 48-72 hours, consider ultrasound.

Why is ultrasound used when mastitis does not improve?

Ultrasound helps differentiate mastitis from a breast abscess.

A lactating woman has fever, chills, localized redness, and warmth of the breast. What is the most appropriate treatment from the presentation?

Oral antibiotics and continued breastfeeding.

What is a breast abscess commonly a complication of?

A breast abscess is usually a complication of lactational mastitis.

What are risk factors for breast abscess listed in the presentation?

First pregnancy; Smoking; * Age greater than 30.

Can breast abscess occur in non-lactating patients?

Yes. The presentation notes non-lactating breast abscess can also occur.

What imaging test helps distinguish mastitis from breast abscess?

Breast ultrasound.

What is the treatment for breast abscess?

Incision and drainage; Needle aspiration.

What antibiotics are listed for breast abscess?

Dicloxacillin; Clindamycin.

A breastfeeding woman has a painful swollen breast area with a fluctuant mass and erythema. What is the most appropriate initial treatment from the presentation?

Needle aspiration of the abscess.

What finding suggests breast abscess rather than uncomplicated mastitis?

A fluctuant mass with overlying erythema suggests breast abscess.

What is a fibroadenoma?

A fibroadenoma is a benign solid breast tumor containing glandular and fibrous tissue.

In what age group is fibroadenoma most common?

Fibroadenoma is most common in late teens and early 20s.

What is the classic clinical presentation of fibroadenoma?

A smooth, non-tender, mobile breast lump.

Can fibroadenomas grow over time?

Yes. The presentation states they can grow over time.

Does fibroadenoma change size with menstruation?

No. It does not get bigger or smaller with menstruation.

How is fibroadenoma diagnosed according to the presentation?

It is usually a clinical diagnosis, but biopsy or ultrasound can be used.

What is the management of confirmed fibroadenoma?

If confirmed, leave it alone; observation is recommended.

Can fibroadenomas reabsorb?

Yes. The presentation states fibroadenomas can reabsorb.

Which benign breast mass is smooth, non-tender, mobile, and does not change with menstruation?

Fibroadenoma.

What are fibrocystic changes?

Fibrocystic changes are cysts in breast tissue that respond to hormones.

What is the typical presentation of fibrocystic changes?

Multiple tiny lumps; Tenderness; * Change in size with menstrual cycles.

How do fibrocystic changes respond to the menstrual cycle?

They change in size with menstrual cycles.

What diagnostic testing is listed for fibrocystic changes?

Ultrasound; Fine needle aspiration (FNA).

What type of fluid is seen on FNA in fibrocystic changes?

Straw-colored fluid.

What is the treatment for fibrocystic changes?

Observation.

Which breast condition presents with multiple tender tiny lumps that change with the menstrual cycle?

Fibrocystic changes.

How does fibroadenoma differ from fibrocystic changes in relation to menstruation?

Fibroadenoma does not change with menstruation, while fibrocystic changes change in size with menstrual cycles.

What physiologic causes of nipple discharge are listed?

Lactation; Pregnancy; * Physiologic discharge.

What is galactorrhea?

Galactorrhea is usually bilateral nipple discharge.

What endocrine disorder should be ruled out in galactorrhea?

Hyperprolactinemia should be ruled out.

What is the next step for a nonpregnant, non-breastfeeding woman with bilateral milky nipple discharge according to the presentation question?

Order a prolactin level.

What colors are listed for non-bloody physiologic or galactorrhea-type discharge?

Clear, yellow, or green discharge can be seen, but not bloody.

What is the usual laterality of pathologic nipple discharge?

Pathologic nipple discharge is usually unilateral.

What are the possible colors of pathologic nipple discharge listed in the presentation?

Clear; Yellow/green; * Bloody.

What benign causes of pathologic nipple discharge are listed?

Papilloma; Duct ectasia; * Mastitis.

What malignant cause is listed for pathologic nipple discharge?

Cancer.

What causes are associated with white, clear, or cloudy nipple discharge in the color chart?

Breastfeeding; Galactorrhea; Hypothyroidism; Prolactinoma.

What causes are associated with yellow nipple discharge in the color chart?

Hormonal fluctuations; Infection.

What causes are associated with green, brown, or black nipple discharge in the color chart?

Duct ectasia; Intraductal papilloma.

What causes are associated with red, pink, or bloody nipple discharge in the color chart?

Intraductal papilloma; Breast cancer.

Which nipple discharge colors raise concern for intraductal papilloma or breast cancer?

Red, pink, or bloody discharge.

Which nipple discharge colors are associated with duct ectasia or intraductal papilloma?

Green, brown, or black discharge.

What is gynecomastia?

Gynecomastia is a non-cancerous condition causing abnormal breast tissue growth in boys and men, resulting in enlarged breasts.

Can gynecomastia affect one or both breasts?

Yes. It can affect one or both breasts and may be uneven.

What hormonal imbalance causes gynecomastia?

An imbalance of estrogen and androgen hormones causes gynecomastia.

What drug-induced causes of gynecomastia are listed?

Anti-androgens; Spironolactone; * Finasteride.

What is the most common cause of gynecomastia in a young male according to the presentation question?

Hormonal imbalance related to puberty.

What is the first management step for drug-induced gynecomastia?

Stop the causing agent.

What pharmacologic/specialty management is listed for gynecomastia?

Hormonal therapy with referral to endocrine.

What procedural treatment is listed for gynecomastia?

Surgery.

A male patient has bilateral breast enlargement and tenderness with otherwise normal exam. What condition is suggested?

Gynecomastia.

What is fat necrosis of the breast?

Fat necrosis is a benign breast condition.

What are common causes of fat necrosis?

Breast trauma; Breast surgery.

How is fat necrosis diagnosed according to the presentation?

Mammogram; Ultrasound; * Biopsy.

What ultrasound or mammogram-associated finding is listed for fat necrosis?

Oil cyst.

What is the treatment for breast fat necrosis?

Observation.

Is excision recommended for fat necrosis?

No. Excision is not recommended.

Does fat necrosis increase the risk of breast cancer?

No. The presentation states there is no increased risk of cancer.

What is breast implant illness (BII)?

BII refers to anecdotal reports suggesting a potential link between silicone gel implants and systemic illness.

What type of implant is mentioned in relation to breast implant illness?

Silicone gel implants.

What did FDA and IOM reviews find about breast implants and systemic illness?

FDA and IOM reviews in 2006 and 1999 found no significant evidence supporting a link between breast implants and systemic illness.

What is the current status of breast implant illness according to the presentation?

It remains controversial and prompted reevaluation by the FDA.

What possible mechanism is mentioned for breast implant illness?

It may be related to allergies, but further research is needed.

What is known about symptom relief after explantation for BII?

Studies on symptom relief after explantation are inconclusive.

What may be considered for symptomatic patients with possible BII?

Periodic breast imaging and explanation if desired.

What implant type is associated with BIA-ALCL?

Textured breast implants are associated with BIA-ALCL.

What did FDA reports from 2011-2019 highlight about BIA-ALCL?

They highlighted the association between BIA-ALCL and textured implants.

What action did the FDA take in 2019 regarding textured implants?

The FDA recalled certain textured implants due to increased BIA-ALCL risk.

Is removal recommended for asymptomatic women with textured implants according to the presentation?

No. There is no recommendation for removal in asymptomatic women with these implants.

Where has breast implant-associated squamous cell carcinoma been reported?

It has been reported in the capsule surrounding breast implants.

Can BIA-SCC occur with textured or smooth implants?

Yes. It has been reported with textured or smooth implants.