Patient Presentation
A 40-year-old woman presents with a palpable lump in her left axilla and associated breast pain. She has noticed the lump over recent weeks and is concerned about cancer.
On focused history you elicit onset, duration, change in size, cyclical pattern, nipple discharge, prior breast disease, gynecologic/menstrual history, and personal and family history of breast and other cancers. On examination you inspect and palpate the breasts both seated and supine, assess for nipple discharge, and examine the cervical, supraclavicular, and axillary nodal basins.
Physical exam and imaging reveal a breast mass with suspicious axillary lymph nodes. You must now decide on appropriate imaging, biopsy strategy, and management based on radiologic-pathologic findings.
What You'll Be Asked — and What a Strong Resident Discusses
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How do you begin the evaluation of this palpable breast mass?
Expected answer
With a focused history and physical exam. History should cover onset, duration, size and change in size, pain, cyclical changes, nipple discharge, prior breast disease, gynecologic history, and personal/family history of cancer including breast cancer. Exam includes inspection and palpation seated and supine, assessment of nipple discharge, and examination of cervical, supraclavicular, and axillary nodes. This drives the 'triple assessment' (clinical exam, imaging, tissue diagnosis).
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What imaging would you order first in this 40-year-old, and why?
Expected answer
At age 40 the preferred first study is a diagnostic mammogram. Mammography may miss lesions in young women or dense breasts, so I would discuss imaging with the radiologist and follow mammogram with targeted ultrasound of the palpable mass and the suspicious axilla. Ultrasound further characterizes the mass, evaluates nodes, and guides biopsy.
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When is ultrasound the imaging study of choice rather than mammography?
Expected answer
Ultrasound is preferred as the initial study for women under 30, and for those who are pregnant or lactating. Women aged 30–39 may reasonably start with ultrasound per ACR Appropriateness Criteria. In all ages, ultrasound is a valuable adjunct after mammogram to characterize the mass and direct biopsy.
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Is MRI indicated in the diagnostic workup of this palpable mass?
Expected answer
MRI is rarely necessary for diagnostic evaluation of a palpable mass. It may be indicated after initial imaging and biopsy — for example, to evaluate extent of disease, multifocality, the contralateral breast, or in select high-risk patients planning treatment.
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Imaging shows a BIRADS 4 mass and abnormal axillary nodes. What is your next step?
Expected answer
Image-guided percutaneous core needle biopsy of the breast mass with placement of a radiologic clip for future identification. I would also biopsy the suspicious axillary node (ultrasound-guided core or FNA), since nodal status changes staging and management. I avoid excisional biopsy as the initial diagnostic step for a suspicious lesion.
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Why core needle biopsy with clip placement rather than FNA or excision for a BIRADS 4/5 lesion?
Expected answer
Core biopsy provides histologic architecture allowing diagnosis of invasive vs. in situ disease and receptor/biomarker testing, which FNA cannot reliably give. The clip marks the lesion so it can be relocated after treatment or for surgical excision, and is essential if the lesion may become non-palpable after neoadjuvant therapy. Excisional biopsy is reserved for discordant results or when core biopsy is not feasible.
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The core biopsy returns benign, but the lesion looked highly suspicious on imaging. How do you proceed?
Expected answer
This is radiologic-pathologic discordance. I would review the case with both the radiologist and pathologist to confirm sampling was adequate and concordant. Discordant benign results warrant repeat biopsy or surgical excisional biopsy, because a falsely reassuring benign core could miss a malignancy.
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How would you manage a BIRADS 3 'probably benign' solid lesion in this patient?
Expected answer
BIRADS 3 lesions have roughly a 2.6–6.9% chance of progression. If new compared to imaging within the past year, core biopsy should be considered. Otherwise, follow with short-interval surveillance: repeat history/exam and imaging at 3 months, then every 6 months until stable for 2 years. Most lesions that progress do so within the first 6 months.
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What if a palpable mass is a simple cyst on ultrasound?
Expected answer
Simple cysts presenting as palpable masses should not be routinely aspirated. Aspiration may be considered for symptomatic relief of a painful cyst. Complex or complicated cysts, or any solid component, require further evaluation and possible biopsy.
What Residents Often Miss
- Ordering mammography alone in a young woman with dense breasts and failing to add targeted ultrasound, missing a lesion.
- Ignoring the suspicious axillary nodes and not biopsying them, which understages the patient.
- Choosing FNA or jumping to excisional biopsy instead of core needle biopsy for a BIRADS 4/5 lesion, losing histologic and receptor information.
- Forgetting to place a radiologic clip at the time of core biopsy, making the lesion hard to relocate after treatment.
- Accepting a benign core biopsy result that is discordant with highly suspicious imaging without re-reviewing or re-biopsying.
- Routinely aspirating simple cysts or over-working up clearly benign BIRADS 1/2 findings.
- Skipping a thorough history and family history, missing high-risk features that change screening and genetic counseling.
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This page is educational content for general-surgery board-exam practice. It is not medical advice and is not a substitute for clinical judgment, institutional protocols, or current primary literature.