Breast Imaging — MCQs

Breast Imaging Indian Medical PG Practice Questions and MCQs

Question 21: What is the investigation of choice for high-risk breast cancer in a female?

A. MRI (Correct Answer)
B. CT-PET
C. Mammography
D. USG

Explanation: **Explanation:** The investigation of choice for screening high-risk females for breast cancer is **Contrast-Enhanced MRI**. **1. Why MRI is the Correct Answer:** MRI has the highest sensitivity (approaching 90-100%) for detecting breast cancer compared to other modalities. In high-risk individuals—defined as those with a lifetime risk >20-25% (e.g., BRCA1/2 mutations, strong family history, or history of chest radiation)—MRI can detect small, invasive cancers that are often occult on mammography due to dense breast tissue typically found in younger high-risk patients. **2. Why Other Options are Incorrect:** * **Mammography:** While it is the gold standard for **average-risk** screening (starting at age 40), its sensitivity is lower in high-risk patients with dense breasts. In high-risk protocols, it is used as an adjunct to MRI, not as a standalone choice. * **USG (Ultrasound):** This is the investigation of choice for females **<30 years** presenting with a palpable lump or as an adjunct to characterize cysts. It is not a primary screening tool for high-risk patients. * **CT-PET:** This is used for staging advanced breast cancer or detecting distant metastasis; it has no role in primary screening due to high radiation and low resolution for microcalcifications. **High-Yield Clinical Pearls for NEET-PG:** * **Best initial investigation (Symptomatic >30 yrs):** Mammography. * **Best initial investigation (Symptomatic <30 yrs):** USG. * **Gold Standard for Implant Rupture:** MRI. * **BI-RADS Category 0:** Incomplete assessment, needs further imaging. * **Characteristic MRI finding of malignancy:** Rapid enhancement followed by rapid washout (Type III curve).

Question 22: The sensitivity of mammography is low in young females because?

A. There is less glandular tissue and more fat
B. Young females are less cooperative
C. The breast tissue is dense (Correct Answer)
D. There is less fat content

Explanation: **Explanation:** The sensitivity of mammography is primarily dependent on the **radiodensity** of the breast tissue. In young females, the breasts are composed of a high proportion of **fibroglandular tissue**, which appears white (radiopaque) on a mammogram. Since most breast cancers and masses also appear white, the dense tissue creates a "masking effect," making it difficult to distinguish a lesion from normal anatomy. * **Why Option C is correct:** As women age, the breast undergoes **fatty involution**, where dense glandular tissue is replaced by fat (which appears dark/radiolucent). In young women, this process has not yet occurred. The lack of contrast between dense tissue and potential tumors leads to a higher rate of false negatives. * **Why Option A is incorrect:** This describes the post-menopausal breast. Less glandular tissue and more fat actually *increase* the sensitivity of mammography. * **Why Option B is incorrect:** Cooperation is rarely a limiting factor for sensitivity; the limitation is purely anatomical and physical. * **Why Option D is incorrect:** While young females do have less fat content, the primary reason for low sensitivity is the presence of dense glandular tissue, which is the specific factor that obscures lesions. **High-Yield Clinical Pearls for NEET-PG:** * **Investigation of Choice (IOC):** For females **<35 years** presenting with a breast lump, **Ultrasound (USG)** is the initial investigation of choice because it can better differentiate masses in dense tissue. * **Mammography Screening:** Usually recommended for women **>40 years**. * **BI-RADS:** The Breast Imaging-Reporting and Data System is used to standardize mammogram reporting. * **MRI Breast:** Has the highest sensitivity for detecting breast cancer and is used for screening high-risk patients (e.g., BRCA mutations).

Question 23: All of the following statements about mammography are TRUE, EXCEPT:

A. Low energy X-rays are used.
B. It is a screening and diagnostic tool.
C. It has a high positive predictive value. (Correct Answer)
D. The specificity of mammography is 95%.

Explanation: ### Explanation **1. Why Option C is the correct answer (The False Statement):** While mammography is highly sensitive (especially in post-menopausal women), it has a **low Positive Predictive Value (PPV)**, typically ranging from **10% to 30%**. This means that out of all patients who have an abnormal mammogram (BI-RADS 4 or 5), only a small fraction actually have biopsy-proven malignancy. The low PPV is a trade-off for high sensitivity, ensuring that fewer cancers are missed, though it leads to a higher rate of "false alarms" and unnecessary biopsies. **2. Analysis of Incorrect Options (The True Statements):** * **Option A:** Mammography uses **low-energy (soft) X-rays** (typically 25–35 kVp) to achieve high contrast between different soft tissues of the breast (fat vs. glandular tissue). Molybdenum or Rhodium targets are used to produce these characteristic low-energy photons. * **Option B:** It serves both roles. **Screening mammography** is performed on asymptomatic women to detect early cancer, while **diagnostic mammography** is used to evaluate clinical symptoms (like a palpable lump) or abnormal screening findings. * **Option C:** The **specificity** of screening mammography is generally high, around **90–95%**. This reflects the test's ability to correctly identify those without the disease. **3. Clinical Pearls for NEET-PG:** * **Standard Views:** Craniocaudal (CC) and Mediolateral Oblique (MLO). The MLO view is best for visualizing the **axillary tail (Tail of Spence)**. * **Best Time for Mammogram:** Day 7 to 10 of the menstrual cycle (to minimize breast tenderness and density). * **BI-RADS Classification:** High-yield for exams. **BI-RADS 0** (Incomplete), **BI-RADS 3** (Probably benign - 6-month follow-up), **BI-RADS 4** (Suspicious - Biopsy required), **BI-RADS 5** (Highly suggestive of malignancy). * **Limitation:** Mammography is less sensitive in **younger women** due to dense breast parenchyma; Ultrasound is the preferred initial modality for women <30–35 years.

Question 24: Which investigation is used to differentiate between scar tissue and residual or recurrence of a breast tumor?

A. Ultrasound (USG)
B. Mammography
C. Magnetic Resonance Imaging (MRI) (Correct Answer)
D. All of the above

Explanation: **Explanation:** The differentiation between post-surgical scar tissue and tumor recurrence is a common clinical challenge. **Magnetic Resonance Imaging (MRI) with Contrast (Gadolinium)** is the investigation of choice for this purpose due to its high sensitivity and the physiological principle of **neoangiogenesis** [2]. 1. **Why MRI is correct:** Malignant tumors exhibit rapid, disordered angiogenesis. When contrast is administered, tumors show **rapid enhancement and early washout** (Kinetic Curve Type III) [1]. In contrast, mature scar tissue is relatively avascular; it typically shows minimal to no enhancement, or very slow, progressive enhancement [1]. This physiological difference allows MRI to distinguish between the two with a high negative predictive value. 2. **Why other options are incorrect:** * **Mammography:** Both scars and tumors can appear as areas of architectural distortion or high-density masses. Mammography cannot reliably distinguish between them, especially in the first 6–12 months post-surgery. * **Ultrasound (USG):** While useful for guided biopsies, both scars and recurrences can appear as hypoechoic areas with posterior acoustic shadowing, leading to diagnostic ambiguity. 3. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** Post-operative MRI should ideally be performed at least **6 months after radiotherapy** to avoid false positives caused by treatment-induced inflammation. * **BI-RADS:** Breast Imaging-Reporting and Data System is the standard reporting lexicon. * **Gold Standard:** While MRI is the best imaging tool, **Biopsy** remains the definitive gold standard for confirming recurrence. * **Screening:** MRI is also the screening modality of choice for high-risk patients (e.g., BRCA1/2 mutations) [3].

Question 25: A BIRADS-0 score on mammography indicates:

A. Negative for cancer
B. Benign
C. Suspicious for malignancy
D. Requires additional imaging or prior examinations (Correct Answer)

Explanation: **Explanation:** The **BI-RADS (Breast Imaging-Reporting and Data System)** is a standardized scoring system developed by the American College of Radiology to communicate breast imaging findings and risk of malignancy. **Why Option D is correct:** A **BI-RADS 0** score signifies an **incomplete assessment**. It is used when the current mammogram does not provide enough information to make a definitive diagnosis. This usually occurs in screening settings where the radiologist needs: 1. **Additional imaging:** Such as spot compression views, magnification views, or a complementary ultrasound. 2. **Comparison with prior films:** To determine if a finding is new or stable over time. **Why other options are incorrect:** * **Option A (Negative):** This corresponds to **BI-RADS 1**, where the breasts are symmetrical with no masses or suspicious calcifications. * **Option B (Benign):** This corresponds to **BI-RADS 2**, where findings like secretory calcifications or simple cysts are present but have 0% risk of malignancy. * **Option C (Suspicious):** This corresponds to **BI-RADS 4**, which carries a 2% to 95% risk of malignancy and requires a tissue biopsy. **High-Yield Clinical Pearls for NEET-PG:** * **BI-RADS 3:** Probably benign (<2% risk); requires short-interval follow-up (usually 6 months). * **BI-RADS 5:** Highly suggestive of malignancy (>95% risk); requires appropriate action (biopsy/surgery). * **BI-RADS 6:** Known biopsy-proven malignancy; used for monitoring response to neoadjuvant chemotherapy. * **Management:** BI-RADS 4 and 5 always necessitate a biopsy. BI-RADS 0 is the only category that is "incomplete" and requires further diagnostic workup before a final category (1–5) can be assigned.

Question 26: What is the preferred investigation for the evaluation of a suspected breast mass in a patient with a breast implant?

A. Ultrasound (USG)
B. Mammography
C. Magnetic Resonance Imaging (MRI) (Correct Answer)
D. All of the above

Explanation: **Explanation:** **1. Why MRI is the Correct Answer:** Magnetic Resonance Imaging (MRI) is the **gold standard** and the most sensitive investigation for evaluating breast masses in patients with implants. The presence of an implant (silicone or saline) creates significant diagnostic challenges on conventional imaging. MRI provides superior soft-tissue contrast and allows for the visualization of breast parenchyma behind and around the implant without the risk of implant rupture. Furthermore, it is the investigation of choice for detecting **implant-related complications** (e.g., intracapsular or extracapsular rupture) while simultaneously screening for malignancy. **2. Why Other Options are Incorrect:** * **Mammography:** While it can be performed using specialized **Eklund views** (implant displacement techniques), the implant material is radiopaque and can obscure up to 25% of the breast tissue, leading to a high false-negative rate. There is also a theoretical risk of implant rupture during compression. * **Ultrasound (USG):** USG is useful for distinguishing cysts from solid masses and is the first-line tool for "snowstorm" appearances in extracapsular leaks. However, it is operator-dependent and lacks the sensitivity of MRI for comprehensive parenchymal evaluation in the presence of an implant. **3. Clinical Pearls for NEET-PG:** * **Linguine Sign:** A classic MRI finding indicating **intracapsular rupture** (collapsed elastomer shell floating in silicone). * **Snowstorm Appearance:** A classic USG finding indicating **extracapsular silicone leakage** into the axillary lymph nodes or tissues. * **BI-RADS 0:** If a mammogram is inconclusive due to an implant, the next step is often MRI. * **Screening:** For routine cancer screening in patients with implants, mammography with Eklund views is still the initial step, but for **diagnostic evaluation of a mass**, MRI is preferred.

Question 27: BIRADS score 5 is:

A. Negative
B. Probably benign
C. Suspicious abnormality
D. Highly suggestive of malignancy (Correct Answer)

Explanation: **Explanation:** The **BI-RADS (Breast Imaging-Reporting and Data System)** is a standardized classification system developed by the American College of Radiology (ACR) to provide a uniform language for reporting breast findings and guiding clinical management. **Correct Answer: D. Highly suggestive of malignancy** A **BI-RADS 5** assessment is reserved for lesions that have a classic appearance of cancer. The probability of malignancy in this category is **≥ 95%**. Findings typically include spiked or spiculated masses, pleomorphic calcifications, and skin retraction. The standard management is a mandatory biopsy. **Analysis of Incorrect Options:** * **A. Negative (BI-RADS 1):** This indicates a normal exam with no masses, architectural distortion, or suspicious calcifications. The risk of malignancy is 0%. * **B. Probably benign (BI-RADS 3):** These findings have a very low risk of malignancy (**< 2%**). Examples include non-palpable, circumscribed solid masses. Management involves short-interval follow-up (usually 6 months) rather than immediate biopsy. * **C. Suspicious abnormality (BI-RADS 4):** This category covers a wide range of risk (**2% to 95%**) and is further subdivided into 4A (low), 4B (moderate), and 4C (high suspicion). Biopsy is required. **High-Yield Clinical Pearls for NEET-PG:** * **BI-RADS 0:** Incomplete; needs further imaging (e.g., additional views or ultrasound). * **BI-RADS 2:** Benign findings (e.g., simple cysts, stable fibroadenomas, or secretory calcifications). Risk is 0%. * **BI-RADS 6:** Known biopsy-proven malignancy; used for imaging done after a diagnosis but before definitive treatment (like surgery or chemotherapy). * **Management Rule:** BI-RADS 4 and 5 always require tissue diagnosis (biopsy).

Question 28: What is the recommendation for BI-RADS 4 classification?

A. Regular follow up
B. Tissue diagnosis (Correct Answer)
C. Short interval follow up
D. Excision

Explanation: The **BI-RADS (Breast Imaging-Reporting and Data System)** is a standardized scoring system used to communicate the risk of malignancy in breast imaging. ### **Explanation of the Correct Answer** **BI-RADS 4** is defined as **"Suspicious Abnormality."** Lesions in this category do not have the classic appearance of malignancy but have a sufficiently high probability of being cancer (**>2% to <95%**) that a definitive diagnosis is required. Therefore, the management recommendation is **Tissue Diagnosis** (usually via Core Needle Biopsy) to rule out malignancy. ### **Analysis of Incorrect Options** * **A. Regular Follow-up:** This is the management for **BI-RADS 1 (Normal)** and **BI-RADS 2 (Benign)**, where the risk of malignancy is 0%. * **C. Short Interval Follow-up:** This is the management for **BI-RADS 3 (Probably Benign)**. It involves a 6-month follow-up to ensure stability, as the risk of malignancy is **≤2%**. * **D. Excision:** While some BI-RADS 4 lesions may eventually require surgical excision (if biopsy shows high-risk lesions like ADH), the *immediate* next step is a needle biopsy (tissue diagnosis), not primary surgical excision. **BI-RADS 5** (>95% risk) often proceeds directly to definitive treatment planning. ### **High-Yield Clinical Pearls for NEET-PG** * **BI-RADS 0:** Incomplete; needs further imaging (e.g., spot compression, ultrasound). * **BI-RADS 4 Sub-categories:** * **4A:** Low suspicion (2–10%) * **4B:** Moderate suspicion (10–50%) * **4C:** High suspicion (50–95%) * **BI-RADS 6:** Known biopsy-proven malignancy; used for monitoring response to neoadjuvant chemotherapy. * **Gold Standard:** For most BI-RADS 4/5 lesions, **Ultrasound-guided Core Needle Biopsy** is preferred over FNAC.

Question 29: Popcorn calcification in mammography is typically seen in which of the following conditions?

A. Fibroadenoma (Correct Answer)
B. Fat necrosis
C. Cystosarcoma phylloides
D. Carcinoma of the breast

Explanation: **Explanation:** **Popcorn calcifications** are a classic radiological hallmark of a **degenerating or involuting fibroadenoma**. Fibroadenomas are the most common benign breast tumors in young women. As these tumors outgrow their blood supply or undergo postmenopausal involution, the hyalinized stroma undergoes calcification. These calcifications are typically large (>2–3 mm), coarse, and dense with irregular borders, resembling kernels of popped corn. **Analysis of Incorrect Options:** * **B. Fat Necrosis:** Typically presents with **"eggshell" or rim calcifications** (thin, hollow, lucent-centered) or dystrophic calcifications. It often occurs following trauma or surgery. * **C. Cystosarcoma Phylloides:** While these are large fibroepithelial tumors, they rarely show specific calcification patterns. They are more commonly characterized by rapid growth and a "leaf-like" appearance on pathology. * **D. Carcinoma of the Breast:** Malignant calcifications are usually **pleomorphic, fine, linear, or branching (casting type)** and are much smaller (microcalcifications) than the coarse popcorn variety. **High-Yield Clinical Pearls for NEET-PG:** * **BI-RADS Category:** Popcorn calcifications are considered **benign (BI-RADS 2)** and do not require biopsy. * **Milk of Calcium:** Seen in fibrocystic changes; characterized by a "tea-cup" appearance on lateral view mammography. * **Secretory Calcifications:** Also known as "rod-like" or "large duct" calcifications, seen in plasma cell mastitis (duct ectasia). * **Skin Calcifications:** Often show a "lucent center" and are typically located in the dermal layer (e.g., in the inframammary fold).

Question 30: Which of the following is seen in carcinoma of the breast?

A. Powdery calcification
B. Popcorn calcification
C. Nodular calcification
D. Pleomorphic calcification (Correct Answer)

Explanation: **Explanation:** In breast imaging, **calcifications** are categorized based on their morphology and distribution to assess the risk of malignancy. **Why Pleomorphic Calcification is Correct:** **Pleomorphic calcifications** (specifically "fine pleomorphic") are highly suspicious for malignancy (BI-RADS 4 or 5). They vary in size, shape, and density, often appearing as "crushed stone" or irregular fragments. These occur when necrotic debris within a malignant duct (as seen in **Ductal Carcinoma in Situ - DCIS**) undergoes mineralization. Their irregular nature reflects the disordered growth and necrosis of cancer cells. **Analysis of Incorrect Options:** * **A. Powdery Calcification:** These are fine, indistinct "cotton wool" appearances. While they can be seen in sclerosing adenosis, they are generally considered "amorphous" and have a lower specificity for cancer compared to pleomorphic types. * **B. Popcorn Calcification:** This is a classic "spotter" for **Involuting Fibroadenoma**. These are large, coarse, and dense calcifications (>2-3 mm) and are pathognomonic for a benign process. * **C. Nodular/Coarse Calcification:** These are typically associated with benign conditions like fat necrosis or old trauma. **High-Yield Clinical Pearls for NEET-PG:** * **BI-RADS Classification:** Calcifications are the primary feature used to detect DCIS on mammography. * **Malignant Patterns:** Fine pleomorphic, fine linear, or branching (casting) calcifications are the most worrisome for malignancy. * **Benign Patterns:** Eggshell/rim calcification (Fat necrosis/Cysts), Rail-track (Arterial atherosclerosis), and Milk of calcium (Tea-cup sign on lateral view). * **Gold Standard:** Mammography is the best initial screening tool for microcalcifications; Ultrasound is generally poor at detecting them.

Practice by Chapter

Breast Anatomy and Physiology

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Male Breast Imaging

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Mammography Techniques

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BI-RADS Classification

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Breast Ultrasonography

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Breast MRI

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Digital Breast Tomosynthesis

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Benign Breast Diseases

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Breast Cancer Detection and Diagnosis

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Interventional Breast Procedures

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Breast Cancer Screening

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Male Breast Imaging

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Post-treatment Breast Imaging

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