Breast Imaging Practice Questions

Q: Which of the following is NOT an indication of malignancy on mammography?

Nodular calcification. ### Explanation In mammography, the primary goal is to differentiate between benign and malignant features based on mass morphology, margins, and calcification patterns. **1. Why "Nodular Calcification" is the correct answer:** Nodular (or "popcorn-like") calcifications are typically large, coarse, and well-defined. These are classic features of **benign** lesions, most commonly seen in **involuting fibroadenomas**. Malignant calcifications, by contrast, are usually pleomorphic, fine-linear, or branching (casting type), representing necrotic debris within ducts (as seen in DCIS). **2. Analysis of Incorrect Options (Malignant Features):** * **Speckled (Spiculated) Margin:** This is the most specific mammographic sign of malignancy. It represents the infiltration of cancer cells into surrounding tissue and the subsequent desmoplastic reaction. * **Attenuated (Distorted) Architecture:** Architectural distortion refers to the pulling or tethering of normal breast parenchyma without a visible central mass. While it can occur in post-surgical scars, in a screening context, it is highly suspicious for invasive lobular or ductal carcinoma. * **Irregular Mass:** Malignant tumors grow haphazardly, leading to an irregular shape. Benign lesions are more likely to be round, oval, or circumscribed. **3. High-Yield Clinical Pearls for NEET-PG:** * **BI-RADS Classification:** Used for standardized reporting. BI-RADS 4 and 5 indicate high suspicion of malignancy. * **Most specific sign of malignancy:** Spiculated margins. * **Benign Calcifications:** Popcorn (Fibroadenoma), Eggshell/Rim (Oil cysts), and Teardrop (Milk of calcium). * **Malignant Calcifications:** Fine pleomorphic or fine-linear branching (BI-RADS 5). * **Initial Investigation:** Mammography is the gold standard for screening women >40 years; Ultrasound is preferred for women <30 years or during pregnancy/lactation.

Q: A 32-year-old lactating mother presented with a painful, palpable lump in her left breast. What is the most appropriate investigation to diagnose her condition?

Ultrasound. **Explanation:** The correct answer is **Ultrasound**. In a young, lactating mother presenting with a painful breast lump, the most likely diagnosis is a **lactational abscess** or **galactocele**. **Why Ultrasound is the investigation of choice:** 1. **Age and Breast Density:** Young and lactating women have dense glandular breast tissue. On mammography, this density obscures underlying lesions (low sensitivity). Ultrasound easily penetrates dense tissue to differentiate between solid masses and fluid-filled collections (abscesses). 2. **Safety:** Ultrasound involves no ionizing radiation, making it the safest modality for pregnant or lactating patients. 3. **Interventional Guidance:** It allows for real-time ultrasound-guided aspiration, which is both diagnostic and therapeutic for an abscess. **Why other options are incorrect:** * **Mammography:** It is the primary screening tool for women >40 years. In lactating women, the increased water content and vascularity of the breast lead to "diffuse whitening" on the film, making it difficult to interpret. * **MRI:** While highly sensitive, it is expensive, not readily available, and usually reserved for staging breast cancer or evaluating implants. It is not the first-line investigation for acute inflammatory conditions. * **SPECT:** This is a nuclear medicine study and has no role in the primary evaluation of a palpable breast lump. **High-Yield Clinical Pearls for NEET-PG:** * **Investigation of Choice (IOC)** for any breast lump in a woman ** 40 years**: **Mammography**. * **BI-RADS (Breast Imaging-Reporting and Data System):** A standardized scoring system used in both USG and Mammography to communicate the risk of malignancy. * **Snowstorm appearance** on breast ultrasound is characteristic of **extracapsular silicone implant rupture**.

Q: A patient presents with a suspicious breast lump. Ultrasonography reports the lesion as BI-RADS-4. What is your inference?

Suspicious lesion requiring biopsy. **Explanation:** The **BI-RADS (Breast Imaging-Reporting and Data System)** is a standardized classification system used to communicate the risk of malignancy in breast imaging. **1. Why Option C is Correct:** **BI-RADS 4** is categorized as **"Suspicious."** Lesions in this category do not have the classic appearance of malignancy but possess features that make cancer a distinct possibility (risk of malignancy ranges from **>2% to <95%**). Therefore, the definitive management for any BI-RADS 4 lesion is a **tissue diagnosis (biopsy)**, typically via Ultrasound-guided Core Needle Biopsy. **2. Why Other Options are Incorrect:** * **Option A (BI-RADS 1 or 2):** BI-RADS 1 is a normal study; BI-RADS 2 represents definitely benign findings (e.g., simple cyst, stable fibroadenoma). Neither requires immediate intervention. * **Option B (BI-RADS 3):** These are "Probably Benign" lesions with a 95% risk). While they also require biopsy, the term "Suspicious" specifically defines Category 4. **High-Yield Clinical Pearls for NEET-PG:** * **BI-RADS 0:** Incomplete assessment; needs further imaging (e.g., comparison with old films or additional views). * **BI-RADS 4 Subdivisions:** 4A (Low suspicion, 2-10%), 4B (Moderate suspicion, 10-50%), and 4C (High suspicion, 50-95%). * **BI-RADS 6:** Confirmed malignancy (biopsy-proven) prior to definitive treatment like surgery or chemotherapy. * **Gold Standard:** For suspicious calcifications seen on mammography, **Stereotactic Biopsy** is the preferred method.

Q: Which of the following is NOT an indication for MRI in breast carcinoma?

Microcalcifications. **Explanation:** **1. Why Microcalcifications is the Correct Answer:** MRI has a very low sensitivity for detecting **microcalcifications**, which are a hallmark of early breast cancer, particularly Ductal Carcinoma In Situ (DCIS). Mammography remains the "Gold Standard" for evaluating microcalcifications. MRI relies on neoangiogenesis (contrast enhancement) rather than calcium deposits; therefore, it cannot reliably differentiate between benign and malignant calcifications. **2. Analysis of Incorrect Options:** * **High-risk cases (B):** MRI is the screening modality of choice for women with a >20-25% lifetime risk (e.g., BRCA1/2 mutations, Li-Fraumeni syndrome, or history of chest radiation). It has a higher sensitivity than mammography in dense breast tissue. * **Breast implant patients (C):** MRI is the most accurate method for evaluating implant integrity (detecting intra- and extracapsular ruptures) and for screening the surrounding breast parenchyma, which may be obscured on mammography. * **Lobular carcinoma in situ/Invasive Lobular Carcinoma (D):** Lobular neoplasia is often multifocal and multicentric. MRI is superior in determining the true extent of disease, detecting contralateral lesions, and identifying occult foci that mammography and ultrasound might miss. **Clinical Pearls for NEET-PG:** * **Best initial investigation for breast lump:** Triple Assessment (Clinical exam + Imaging + Biopsy). * **Best screening for general population:** Mammography. * **Best screening for young/high-risk/dense breasts:** MRI. * **MRI Contrast:** Gadolinium is used; malignant lesions show **rapid wash-in and rapid wash-out** (Type III curve). * **Indications for MRI:** Assessment of response to Neoadjuvant Chemotherapy (NACT), occult primary (axillary node positive, breast negative), and Paget’s disease of the nipple.

Question 1

Which of the following is NOT an indication of malignancy on mammography?

Accepted Answer

Nodular calcification

Answer

Speckled margin

Answer

Attenuated architecture

Answer

Irregular mass

Question 2

What is the primary purpose of the BIRADS score?

Accepted Answer

To maintain uniformity in the reporting of imaging findings of various breast diseases

Answer

To prognosticate breast cancer

Answer

To evaluate the effect of brachial artery thrombosis

Answer

To establish a clinicoradiological association of breast malignancy

Question 3

A 32-year-old lactating mother presented with a painful, palpable lump in her left breast. What is the most appropriate investigation to diagnose her condition?

Accepted Answer

Ultrasound

Answer

Mammography

Answer

MRI

Answer

SPECT

Question 4

A patient presents with a suspicious breast lump. Ultrasonography reports the lesion as BI-RADS-4. What is your inference?

Accepted Answer

Suspicious lesion requiring biopsy

Answer

Benign lesion requiring no follow-up

Answer

Probably benign lesion requiring follow-up

Answer

Highly suggestive of malignancy

Question 5

Which of the following is NOT an indication for MRI in breast carcinoma?

Accepted Answer

Microcalcifications

Answer

High-risk cases

Answer

Breast implant patients

Answer

Lobular carcinoma in situ

Breast Imaging — MCQs

Breast Imaging — MCQs

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