Breast Cancer vs Fibroadenoma
Breast Cancer and Fibroadenoma are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Breast Cancer vs Fibroadenoma at a glance
- Breast Cancer: Most common non-skin cancer in women; molecular subtypes (HR, HER2, triple-negative) drive treatment.
- Fibroadenoma: Benign fibroepithelial breast tumor — most common breast mass in women under 30.
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Side-by-side comparison
| Feature | Breast Cancer | Fibroadenoma |
|---|---|---|
| At a glance | Most common non-skin cancer in women; molecular subtypes (HR, HER2, triple-negative) drive treatment. | Benign fibroepithelial breast tumor — most common breast mass in women under 30. |
| Classic presentation | Painless palpable breast lump (most common); Skin changes: dimpling, retraction, peau d'orange, erythema; Nipple changes: inversion, eczematous changes (Paget), bloody discharge; Axillary mass; Often asymptomatic — detected on screening mammography; Advanced: bone pain, dyspnea (lung/pleural mets), neurologic symptoms; Firm, fixed,… | Young woman with a firm, rubbery, mobile, painless breast mass — well-circumscribed on ultrasound.; Painless, slow-growing, smooth mass; Mobile under the skin ('breast mouse'); Usually solitary but can be multiple/bilateral; May grow during pregnancy or with hormonal therapy; Firm, rubbery, well-circumscribed, highly mobile mass;… |
| Workup / key labs | Tissue diagnosis with histology and biomarkers required. AJCC 8th edition combines anatomic stage with biologic factors (ER, PR, HER2, grade).; CBC, BMP, LFTs; ER, PR, HER2 testing on biopsy specimen — mandatory for treatment planning; Ki-67 proliferation index in select cases; Genomic assays (Oncotype DX, MammaPrint) for select ER+… | Ultrasound — first-line for women <30; well-circumscribed, hypoechoic, oval mass with parallel orientation; Mammography for women ≥30 — round/oval mass with smooth margins; coarse 'popcorn' calcifications in involuting older lesions; Core needle biopsy — definitive diagnosis; recommended for masses >2 cm, growing lesions, atypical… |
| Imaging | Diagnostic mammography ± ultrasound for symptomatic mass; ultrasound preferred for women <30; MRI breast — high-risk screening, evaluation of newly diagnosed cancer in select cases (lobular, dense breasts, occult primary); Core needle biopsy (preferred) or surgical biopsy for tissue diagnosis; Staging: CT chest/abdomen/pelvis and bone… | Ultrasound — first-line for women <30; well-circumscribed, hypoechoic, oval mass with parallel orientation; Mammography for women ≥30 — round/oval mass with smooth margins; coarse 'popcorn' calcifications in involuting older lesions; Core needle biopsy — definitive diagnosis; recommended for masses >2 cm, growing lesions, atypical… |
| First-line treatment | Local: lumpectomy + radiation (breast-conserving therapy) OR mastectomy; outcomes equivalent for appropriately selected patients; Axillary staging: sentinel lymph node biopsy (preferred); axillary lymph node dissection if positive sentinel nodes with significant burden; Reconstruction: implant or autologous, immediate or delayed;… | Observation — for biopsy-proven simple fibroadenomas; clinical exam and imaging follow-up at 6 and 12 months; Reassurance; No restrictions on activities, contraception, or pregnancy |
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