BI-RADS Classification — MCQs
Which of the following statements are true? 1. Due to increasing mammography there occurs over diagnosis of breast carcinoma 2. Colon cancer screening is done by digital rectal examination 3. Oral cancer screening is done by visual inspection 4. Cervix cancer screening is done by a pap smear
Risk of malignancy in BIRADS score 2 is
Which of the following features on mammogram would suggest malignancy?
On mammogram, all of the following are the features of a malignant tumor except:
In which of the following situations is breast conservation surgery not indicated?
Current gold standard to detect ductal carcinoma in situ breast is:
For normal mammography, what is the nominal focal size of the X-ray tube used?
What is the typical radiation dose delivered during mammography?
Which of the following is NOT an indication of malignancy on mammography?
What is the primary purpose of the BIRADS score?
BI-RADS Classification Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following statements are true? 1. Due to increasing mammography there occurs over diagnosis of breast carcinoma 2. Colon cancer screening is done by digital rectal examination 3. Oral cancer screening is done by visual inspection 4. Cervix cancer screening is done by a pap smear
- A. 1,2,3,4
- B. 4 only
- C. 1,3,4 (Correct Answer)
- D. 2,3,4
Explanation: ***Correct: 1,3,4*** - **Statement 1 is TRUE**: Overdiagnosis is a well-documented consequence of increased mammography screening. It detects slow-growing tumors that might never have caused clinical symptoms or harm during a woman's lifetime, leading to unnecessary treatment and associated morbidities. - **Statement 3 is TRUE**: Oral cancer screening primarily involves thorough visual inspection by a healthcare professional to identify suspicious lesions, ulcers, or color changes in the oral cavity. - **Statement 4 is TRUE**: Cervical cancer screening is effectively done by Pap smear, which detects precancerous and cancerous cells. - **Statement 2 is FALSE**: Digital rectal examination is NOT the primary screening method for colon cancer. Standard screening methods include colonoscopy, fecal occult blood testing (FOBT), and fecal immunochemical test (FIT). *Incorrect: 1,2,3,4* - While statements 1, 3, and 4 are true, statement 2 is incorrect. Digital rectal examination is not a primary or definitive screening method for colon cancer—it only examines the rectum and misses most of the colon. *Incorrect: 4 only* - While cervical cancer screening by Pap smear is true, this option is incomplete as it misses other true statements (1 and 3) regarding mammography overdiagnosis and oral cancer screening. *Incorrect: 2,3,4* - This option incorrectly includes statement 2. Colon cancer screening is NOT done by digital rectal examination. Proper screening methods include colonoscopy, FOBT, FIT, and flexible sigmoidoscopy.
Question 2: Risk of malignancy in BIRADS score 2 is
- A. 0% (Correct Answer)
- B. 2-4%
- C. 10%
- D. 50%
Explanation: ***0%*** - A **BIRADS score of 2** indicates a **definitively benign finding**, meaning there is **essentially 0% risk of malignancy**. - BIRADS 2 is assigned to findings that are clearly benign such as **simple cysts, intramammary lymph nodes, calcified fibroadenomas**, and other characteristically benign lesions. - **No follow-up or intervention is required** for BIRADS 2 findings. *2-4%* - This risk range is typically associated with **BIRADS 4A** lesions (low suspicion for malignancy), which require **tissue diagnosis/biopsy**. - BIRADS 2 findings are definitively benign and have no measurable risk of malignancy. *10%* - A 10% risk of malignancy is aligned with **BIRADS 4A-4B** lesions (low to moderate suspicion), which require **biopsy**. - This percentage indicates a suspicious finding, which is completely different from a definitively benign BIRADS 2 finding. *50%* - A 50% risk of malignancy corresponds to a highly suspicious finding, typically **BIRADS 4C**, demanding **immediate biopsy**. - This level of risk is far too high for a benign finding like BIRADS 2, which carries no risk of malignancy.
Question 3: Which of the following features on mammogram would suggest malignancy?
- A. Smooth borders
- B. Well defined lesion
- C. A mass of decreased density
- D. Areas of spiculated microcalcifications (Correct Answer)
Explanation: ***Areas of spiculated microcalcifications*** - **Spiculated microcalcifications** are highly suspicious for malignancy due to their irregular shape, distribution, and association with rapid, uncontrolled cell growth. - These calcifications often represent **necrotic cells** within rapidly growing tumors, which can deposit calcium. *Smooth borders* - **Smooth borders** typically indicate a benign lesion, such as a cyst or fibroadenoma, as they suggest gradual, uniform growth rather than invasive spread. - Malignant lesions tend to have **irregular** or ill-defined borders due to their infiltrative nature. *Well defined lesion* - A **well-defined lesion** usually suggests a benign process, as it indicates a mass that is clearly demarcated from surrounding tissue and is likely encapsulated. - Malignancies, conversely, often exhibit **indistinct or irregular margins** as they invade adjacent structures. *A mass of decreased density* - A mass of **decreased density** is generally considered a benign finding, often representing a **cyst** or an area of normal fatty tissue. - Malignant tumors typically present as a **mass of increased density** due to their cellular proliferation and desmoplastic reaction.
Question 4: On mammogram, all of the following are the features of a malignant tumor except:
- A. Microcalcification
- B. Irregular mass
- C. Macrocalcification (Correct Answer)
- D. Spiculation
Explanation: ***Macrocalcification*** - **Macrocalcifications** are typically **benign** and are often associated with involutional changes in the breast, such as aging or fibroadenomas. - These are usually larger, coarser calcifications that are easily seen and rarely indicate malignancy. *Microcalcification* - **Microcalcifications**, especially when **pleomorphic**, **linear**, or grouped, are a significant indicator of potential malignancy, such as **ductal carcinoma in situ (DCIS)**. - They represent calcium deposits within the ducts or stromal tissue, which can be associated with rapidly proliferating cells. *Irregular mass* - An **irregularly shaped mass** with ill-defined margins is highly suspicious for malignancy because it suggests invasive growth into surrounding tissues. - Unlike benign lesions which tend to be round or oval with smooth borders, malignant tumors often grow in an uncontrolled, infiltrative manner. *Spiculation* - **Spiculation** refers to **radiating lines or projections** extending from the borders of a mass, indicating an infiltrative process highly suggestive of malignancy. - These spicules represent fibrous tissue reaction to an invading tumor and are a strong predictor of breast cancer.
Question 5: In which of the following situations is breast conservation surgery not indicated?
- A. SLE
- B. Large pendular breast
- C. Diffuse microcalcification
- D. All of the options (Correct Answer)
Explanation: ***All of the options*** - All listed scenarios—**large pendular breast**, **SLE**, and **diffuse microcalcification**—represent situations where breast conservation surgery is generally contraindicated or challenging. - Their presence often necessitates alternative treatment approaches, such as mastectomy, to achieve optimal oncologic and cosmetic outcomes. *Large pendular breast* - While not an absolute contraindication, a **very large or pendulous breast** can make it difficult to achieve a satisfactory cosmetic outcome after breast conservation surgery. - The disproportionate breast size post-lumpectomy may lead to significant **asymmetry**, requiring further reconstructive procedures. *SLE* - Patients with **Systemic Lupus Erythematosus (SLE)** are at an increased risk of complications from radiation therapy, a mandatory component of breast conservation surgery. - They tend to experience more severe and prolonged **acute and chronic skin reactions** to radiation, which can significantly impair healing and quality of life. *Diffuse microcalcification* - **Diffuse microcalcification** within the breast can indicate widespread in situ carcinoma (e.g., DCIS) or an invasive carcinoma with extensive intraductal component. - In such cases, achieving **clear surgical margins** with breast conservation surgery can be challenging and often leads to multiple re-excisions or an increased risk of local recurrence.
Question 6: Current gold standard to detect ductal carcinoma in situ breast is:
- A. Mammography (Correct Answer)
- B. CT/PET
- C. MRI
- D. USG
Explanation: ***Mammography*** - **Mammography** is the gold standard for detecting **ductal carcinoma in situ (DCIS)**, often visible as microcalcifications. - It plays a crucial role in early detection and has been a cornerstone of breast cancer screening for decades. *CT/PET* - **CT scans** are primarily used for evaluating tumor extent and metastasis, not for initial DCIS detection. - **PET scans** are not routinely used for DCIS due to their lower resolution for subtle changes and higher false-negative rates for small lesions. *MRI* - While **MRI** is highly sensitive for breast cancer, its specificity for **DCIS** is lower, often leading to false positives. - It is typically used as an adjunct to mammography for high-risk screening or for evaluating the extent of known cancer, not as a primary screening tool for DCIS. *USG* - **Ultrasound (USG)** is effective for evaluating palpable masses or specific areas of concern identified on mammography, but it is not sensitive enough to reliably detect **microcalcifications** characteristic of DCIS. - It is often used to differentiate between solid and cystic lesions or guide biopsies, but not as a primary screening tool for DCIS.
Question 7: For normal mammography, what is the nominal focal size of the X-ray tube used?
- A. 0.2-0.25 mm
- B. 0.3-0.35 mm (Correct Answer)
- C. 0.4-0.45 mm
- D. 0.45-0.50 mm
Explanation: In mammography, high spatial resolution is critical for detecting tiny structures like microcalcifications. The focal spot size directly influences **geometric blurring** (penumbra); a smaller focal spot results in a sharper image. ### 1. Why Option B is Correct For **routine (normal) mammography**, a nominal focal spot size of **0.3 mm** (typically ranging from 0.3 to 0.35 mm) is the standard. This size provides an optimal balance: it is small enough to ensure high detail for screening while being large enough to withstand the heat generated by the X-ray tube during standard exposures without damaging the anode. ### 2. Why Other Options are Incorrect * **Option A (0.2-0.25 mm):** This is too large for magnification but smaller than the standard for routine screening. * **Options C & D (0.4-0.5 mm):** These sizes are used in general radiography (e.g., Chest X-rays, where focal spots are often 0.6–1.2 mm). In mammography, such large spots would cause excessive geometric blurring, making it impossible to see fine architectural distortions. ### 3. High-Yield Clinical Pearls for NEET-PG * **Magnification Mammography:** When a specific area needs to be magnified, a much smaller focal spot of **0.1 mm** (range 0.1–0.15 mm) is used to compensate for the increased blurring caused by the air gap. * **Anode Material:** Usually **Molybdenum (Mo)** or Rhodium (Rh) is used to produce low-energy (soft) X-rays (25–30 kVp) for better soft-tissue contrast. * **Orientation:** The cathode is placed over the **base of the breast** (chest wall) and the anode over the **apex** (nipple) to utilize the "Heel Effect" for uniform density.
Question 8: What is the typical radiation dose delivered during mammography?
- A. 0.1 Gray/study
- B. 0.01 centiGray/study
- C. 0.1 centiGray/study (Correct Answer)
- D. 0.01 Gray/study
Explanation: ### Explanation **1. Why Option C is Correct:** The radiation dose in mammography is measured as the **Mean Glandular Dose (MGD)**, which represents the average dose to the radiosensitive glandular tissue of the breast. For a standard two-view screening mammogram (per breast), the typical dose is approximately **1 to 2 mGy (0.1 to 0.2 rad)**. Since **1 rad = 1 centiGray (cGy)**, a dose of 0.1 rad is equivalent to **0.1 cGy**. This level of radiation is considered very low and is roughly equivalent to the amount of natural background radiation a person receives over seven weeks. **2. Why Other Options are Incorrect:** * **Option A (0.1 Gray):** This is equivalent to 100 mGy. This dose is far too high for diagnostic imaging and would be closer to levels used in therapeutic radiation or causing deterministic effects. * **Option B (0.01 cGy):** This is 0.1 mGy, which is too low to produce a diagnostic quality image of dense breast tissue. * **Option D (0.01 Gray):** This is equivalent to 10 mGy (1 rad). While some complex interventional procedures might reach this level, it is significantly higher than the standard dose for a screening mammogram. **3. High-Yield Clinical Pearls for NEET-PG:** * **Target/Filter Material:** Mammography uses low-energy X-rays (typically **25–35 kVp**) to maximize soft tissue contrast. Common target/filter combinations are **Molybdenum/Molybdenum** or **Rhodium**. * **MQSA Requirement:** The Mammography Quality Standards Act (MQSA) mandates that the dose should not exceed **3 mGy (0.3 cGy)** per view with a grid. * **Screening Guidelines:** In India, the general recommendation is annual or biennial screening starting at age 40–50 years. * **Risk vs. Benefit:** The risk of radiation-induced breast cancer is negligible compared to the benefit of early detection of spontaneous breast cancer.
Question 9: Which of the following is NOT an indication of malignancy on mammography?
- A. Nodular calcification (Correct Answer)
- B. Speckled margin
- C. Attenuated architecture
- D. Irregular mass
Explanation: ### 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.
Question 10: What is the primary purpose of the BIRADS score?
- A. To maintain uniformity in the reporting of imaging findings of various breast diseases (Correct Answer)
- B. To prognosticate breast cancer
- C. To evaluate the effect of brachial artery thrombosis
- D. To establish a clinicoradiological association of breast malignancy
Explanation: **Explanation:** The **BI-RADS (Breast Imaging-Reporting and Data System)** is a standardized quality assurance tool developed by the American College of Radiology (ACR). Its primary objective is to **standardize breast imaging reporting**, reduce ambiguity in interpretations, and facilitate clear communication between radiologists and clinicians. By providing a uniform lexicon and structured assessment categories (0–6), it ensures that a specific finding carries the same clinical weight regardless of the reporting radiologist. **Analysis of Options:** * **Option A (Correct):** BI-RADS provides a universal language for describing findings (e.g., mass margins, calcification morphology) and assigns a final assessment category that dictates management. * **Option B (Incorrect):** Prognosis is determined by TNM staging, histological grade, and molecular markers (ER/PR/HER2 status), not by the initial BI-RADS score. * **Option C (Incorrect):** BI-RADS is specific to breast imaging (Mammography, USG, MRI) and has no relevance to vascular conditions like brachial artery thrombosis. * **Option D (Incorrect):** While BI-RADS guides management, its primary goal is the standardization of the *imaging report* itself, rather than establishing clinical-pathological correlations. **High-Yield Clinical Pearls for NEET-PG:** * **BI-RADS 0:** Incomplete; needs further imaging (e.g., spot compression or comparison with old films). * **BI-RADS 3:** Probably benign (<2% risk of malignancy); management is **short-interval follow-up** (usually 6 months). * **BI-RADS 4 & 5:** Suspicious and Highly Suggestive; both require **tissue diagnosis (biopsy)**. * **BI-RADS 6:** Known biopsy-proven malignancy; used for monitoring response to neoadjuvant chemotherapy.
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