# Clinical Cases: Breast Disease

## Case 1: Invasive Ductal Carcinoma

### Patient Demographics
- **Age:** 54 years
- **Sex:** Female
- **Occupation:** High school teacher

### Chief Complaint
"I found a lump in my right breast during my monthly self-exam."

### History of Present Illness
The patient noticed a firm mass in her right breast 3 weeks ago during routine self-examination. The mass is not painful and has not changed in size since she first noticed it. She has not noticed any nipple discharge, skin changes, or axillary lumps. Her last mammogram was 14 months ago and was reported as normal. She is postmenopausal with her last menstrual period at age 51.

### Past Medical History
- Hypertension
- Hyperlipidemia
- Menarche at age 12
- G2P2, first pregnancy at age 28
- Menopause at age 51
- Never used hormone replacement therapy
- No prior breast biopsies

### Family History
- Mother: Breast cancer at age 62, died at age 70 from metastatic disease
- Maternal aunt: Ovarian cancer at age 58
- Father: Prostate cancer at age 75, currently alive
- No known BRCA mutations in family

### Medications
- Lisinopril 10 mg daily
- Atorvastatin 20 mg daily

### Social History
- Non-smoker
- Occasional wine (2-3 glasses per week)
- Regular exercise

### Physical Examination
- **Vitals:** BP 128/78 mmHg, HR 72 bpm
- **Breast examination:**
  - Right breast: 2 cm firm, irregular, fixed mass in the upper outer quadrant at 10 o'clock position, approximately 3 cm from the nipple
  - No skin dimpling, peau d'orange, or nipple retraction
  - No nipple discharge
  - Left breast: No masses, normal appearance
- **Axillary examination:**
  - Right: One palpable lymph node, 1 cm, mobile, non-tender
  - Left: No palpable nodes
- **Supraclavicular:** No palpable nodes

### Diagnostic Workup

**Diagnostic Mammogram:**
- Right breast: 2.2 cm spiculated mass at 10 o'clock, 3 cm from nipple
- Associated pleomorphic microcalcifications
- BI-RADS Category 5 (highly suspicious for malignancy)
- Left breast: No suspicious findings

**Breast Ultrasound:**
- Right breast: 2.1 x 1.8 x 1.5 cm hypoechoic, irregular mass with acoustic shadowing
- Right axilla: 1.2 cm lymph node with thickened cortex, loss of fatty hilum

**MRI Breast (bilateral with contrast):**
- Right breast: 2.3 cm enhancing mass with washout kinetics
- No additional suspicious lesions in either breast
- Chest wall not involved

**Core Needle Biopsy Results:**
- Breast mass: Invasive ductal carcinoma, Nottingham Grade 2
- ER: Positive (95%)
- PR: Positive (80%)
- HER2: Negative (IHC 1+)
- Ki-67: 18%
- Axillary lymph node: Metastatic carcinoma consistent with breast primary

### Staging Workup
- CT Chest/Abdomen/Pelvis: No evidence of distant metastases
- Bone scan: No osseous metastases
- Clinical Stage: cT2N1M0 (Stage IIB)

### Multidisciplinary Tumor Board Discussion
- Patient discussed at breast tumor board
- Oncotype DX testing recommended given ER+ disease
- Options presented: neoadjuvant chemotherapy vs. surgery first
- Patient preference: proceed with surgery

### Genetic Counseling and Testing
Given family history of breast and ovarian cancer:
- BRCA1/BRCA2 testing performed
- Result: BRCA2 mutation positive

### Surgical Planning
Given BRCA2 mutation and patient preference after extensive counseling:
- Right mastectomy with sentinel lymph node biopsy
- Contralateral prophylactic mastectomy offered and accepted
- Immediate reconstruction planned with tissue expanders

### Operative Procedure
- Bilateral skin-sparing mastectomies
- Right sentinel lymph node biopsy (3 nodes removed)
- Immediate reconstruction with bilateral tissue expanders
- Sentinel node frozen section: 1/3 positive for macrometastasis
- Completion axillary lymph node dissection performed (Level I/II)

### Pathology Results
- Right breast: 2.4 cm invasive ductal carcinoma, Grade 2
- Margins: Negative (closest margin 0.8 cm)
- Lymph nodes: 2/14 positive for metastatic carcinoma (no extracapsular extension)
- Left breast: No malignancy
- Final Pathologic Stage: pT2N1aM0 (Stage IIB)

### Adjuvant Treatment Plan
- Oncotype DX recurrence score: 22 (intermediate)
- Recommended treatment:
  - Adjuvant chemotherapy (TC x 4 cycles)
  - Radiation therapy to chest wall (given positive nodes)
  - Endocrine therapy (aromatase inhibitor for 5-10 years)

### Teaching Points
1. Triple assessment: clinical exam, imaging, and biopsy
2. BI-RADS classification guides management
3. Multidisciplinary tumor board essential for treatment planning
4. BRCA testing indicated with suggestive family history
5. Surgical options include breast conservation vs. mastectomy
6. Adjuvant therapy based on stage and tumor biology

### Clinical Image
![Mammogram Breast Cancer](case_01_image.jpg)

**Image Description:** Mammogram demonstrating a spiculated mass characteristic of invasive breast carcinoma. The irregular borders with radiating spicules and associated microcalcifications are highly suspicious features classified as BI-RADS 5.

**Attribution:** Image from Wikimedia Commons, Category:Mammography images of breast cancer. Source: https://commons.wikimedia.org/wiki/Category:Mammography

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## Case 2: Fibroadenoma in Young Woman

### Patient Demographics
- **Age:** 24 years
- **Sex:** Female
- **Occupation:** Graduate student

### Chief Complaint
"I noticed a lump in my left breast that moves around."

### History of Present Illness
The patient noticed a mass in her left breast 2 months ago while showering. The mass is not painful and seems to move easily when she touches it. She has not noticed any changes in size with her menstrual cycle. She denies nipple discharge, skin changes, or other breast masses. She is otherwise healthy with regular menstrual cycles.

### Past Medical History
- No significant medical history
- Menarche at age 13
- Regular menstrual cycles
- G0P0
- No prior breast biopsies

### Family History
- No family history of breast or ovarian cancer
- Mother and sister healthy

### Medications
- Combined oral contraceptive pill

### Physical Examination
- **Breast examination:**
  - Left breast: 2 cm smooth, firm, rubbery, mobile mass in the lower outer quadrant
  - Non-tender
  - "Slippery" quality - moves easily with palpation
  - No skin changes, nipple discharge, or axillary lymphadenopathy
  - Right breast: Normal, no masses

### Diagnostic Workup

**Breast Ultrasound (first-line imaging in young women):**
- Left breast: 2.1 x 1.8 x 1.0 cm well-circumscribed, oval, hypoechoic mass
- Parallel orientation (wider than tall)
- Homogeneous internal echoes
- No acoustic shadowing
- BI-RADS Category 3 (probably benign)

### Assessment
Clinical and sonographic features consistent with fibroadenoma in a young woman with no risk factors.

### Management Options Discussed
1. **Short-term follow-up:** Repeat ultrasound in 6 months
2. **Core needle biopsy:** For definitive tissue diagnosis
3. **Excision:** If patient prefers or lesion is growing

Patient expressed anxiety about the mass and requested biopsy for definitive diagnosis.

### Core Needle Biopsy Result
- Fibroadenoma
- No atypia
- Concordant with imaging findings

### Management Plan
- Reassurance provided
- Options discussed:
  - Observation with periodic self-exam
  - Excision if mass grows or causes symptoms
- Patient chose observation
- Follow-up ultrasound in 6 months, then annually

### Six-Month Follow-up
- Ultrasound: Mass unchanged at 2.0 cm
- Patient reassured, continued observation recommended

### Teaching Points
1. Fibroadenomas are the most common benign breast tumor in young women
2. Classic features: smooth, mobile, "breast mouse"
3. Ultrasound is first-line imaging in women under 30
4. Core biopsy provides tissue diagnosis when needed
5. Most fibroadenomas can be observed; excision for growth, symptoms, or patient preference
6. Fibroadenomas do not increase breast cancer risk (unless complex features)

### Clinical Image
![Breast Ultrasound Fibroadenoma](case_02_image.jpg)

**Image Description:** Breast ultrasound demonstrating a well-circumscribed, oval, hypoechoic mass with parallel orientation typical of a fibroadenoma. The smooth margins and homogeneous internal echoes are characteristic benign features.

**Attribution:** Image from Wikimedia Commons. Source: https://commons.wikimedia.org/wiki/Category:Breast_cancer

---

## Case 3: Inflammatory Breast Cancer

### Patient Demographics
- **Age:** 48 years
- **Sex:** Female
- **Occupation:** Office manager

### Chief Complaint
"My breast has become red and swollen over the past month."

### History of Present Illness
The patient presents with a 4-week history of progressive redness, warmth, and swelling of her right breast. She initially thought she had a breast infection and was treated with antibiotics (cephalexin) by her primary care physician 2 weeks ago with no improvement. The affected area has expanded to involve most of the breast. She also notes her breast feels heavier and the skin has developed an "orange peel" texture. She denies fever, trauma, or recent breastfeeding. She has noticed some discomfort but no discrete lump.

### Past Medical History
- Hypertension
- Obesity (BMI 34)
- Menarche at age 11
- G3P3, first pregnancy at age 22
- Regular menstrual periods
- No prior breast disease

### Family History
- No family history of breast cancer

### Medications
- Amlodipine 10 mg daily

### Physical Examination
- **Vitals:** BP 138/86 mmHg, HR 82 bpm, Temp 37.0°C
- **Breast examination:**
  - Right breast: Diffusely enlarged, erythematous involving >2/3 of breast skin
  - Peau d'orange (skin edema with prominent pores)
  - Warmth to touch
  - No discrete mass palpable (diffuse firmness)
  - Nipple flattening
  - Left breast: Normal
- **Axillary examination:**
  - Right: Multiple enlarged, firm lymph nodes
  - Left: No palpable nodes

### Diagnostic Workup

**Diagnostic Mammogram:**
- Right breast: Diffuse skin thickening, trabecular thickening
- Increased breast density
- No discrete mass
- Right axillary adenopathy

**Breast Ultrasound:**
- Diffuse skin thickening (8 mm, normal <2 mm)
- Diffuse parenchymal edema
- Multiple abnormal axillary lymph nodes

**MRI Breast:**
- Diffuse skin and trabecular thickening
- Non-mass enhancement throughout right breast
- Pectoralis muscle involvement suspected
- Multiple pathologic axillary and internal mammary nodes

**Skin Punch Biopsy:**
- Dermal lymphatic invasion by carcinoma
- ER: Negative
- PR: Negative
- HER2: Positive (3+ by IHC, confirmed by FISH)

**Core Biopsy of Breast Parenchyma:**
- Invasive ductal carcinoma, high grade
- ER/PR negative, HER2 positive

**Staging Workup:**
- CT Chest/Abdomen/Pelvis: Right axillary and internal mammary adenopathy, no distant metastases
- PET-CT: Intense uptake in right breast, right axillary, and right internal mammary nodes; no distant metastases
- Clinical Stage: cT4dN2M0 (Stage IIIB - Inflammatory Breast Cancer)

### Multidisciplinary Tumor Board
- Diagnosis: Inflammatory breast cancer (IBC), HER2-positive
- Treatment plan: Neoadjuvant systemic therapy followed by surgery and radiation

### Treatment Plan

**Neoadjuvant Chemotherapy:**
- TCHP regimen (docetaxel, carboplatin, trastuzumab, pertuzumab) x 6 cycles

**Response Assessment (after 6 cycles):**
- Clinical: Marked improvement - erythema resolved, breast size decreased
- MRI: Significant reduction in enhancement, skin thickening improved
- Clinical partial response

**Surgery:**
- Modified radical mastectomy (skin-sparing not appropriate for IBC)
- Wide skin excision including all previously involved skin
- Axillary lymph node dissection

**Pathology:**
- 1.2 cm residual invasive carcinoma
- 2/18 axillary nodes positive
- Pathologic partial response

**Adjuvant Therapy:**
- Radiation therapy to chest wall and regional nodes
- Continue HER2-targeted therapy (trastuzumab + pertuzumab) to complete 1 year
- T-DM1 given residual disease (KATHERINE trial protocol)

### Teaching Points
1. Inflammatory breast cancer is a clinical diagnosis (erythema, peau d'orange, rapid onset)
2. Often no palpable mass - diagnosis requires high clinical suspicion
3. Skin punch biopsy showing dermal lymphatic invasion is pathognomonic
4. ALWAYS staged as at least T4d (Stage III) at presentation
5. Tri-modality treatment required: systemic therapy, surgery, radiation
6. Neoadjuvant therapy is standard of care
7. Breast conservation is contraindicated in IBC

### Clinical Image
![Inflammatory Breast Cancer](case_03_image.jpg)

**Image Description:** Clinical photograph demonstrating the characteristic appearance of inflammatory breast cancer with diffuse erythema, skin edema (peau d'orange), and breast enlargement. The affected skin shows the typical "orange peel" texture due to dermal lymphatic obstruction.

**Attribution:** Image from Wikimedia Commons, Category:Breast cancer. Source: https://commons.wikimedia.org/wiki/Category:Breast_cancer