Male Breast Imaging — MCQs
Which of the following statements is true regarding the anatomy of the breast?
Which of the following glands is NOT involved in Type I MEN?
All of the following can result in gynecomastia except:
In which of the following types of breast carcinoma would you consider a biopsy of the opposite breast?
Mammography can be best used in?
Lesions affecting the terminal duct lobular unit (TDLU) in breast are all except
Which of the following cancers is least associated with BRCA2 mutations?
Best investigation to detect rupture of silicone breast implants is-
Which of the following is the most sensitive investigation for ductal carcinoma in situ (DCIS) of the breast?
Which of the following features on mammogram would suggest malignancy?
Male Breast Imaging Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following statements is true regarding the anatomy of the breast?
- A. The superior medial quadrant has more tissue
- B. The nipple is located at the level of the fourth intercostal space in most women
- C. There are 15-20 lobules present
- D. The axillary tail of Spence crosses the anterior axillary fold (Correct Answer)
Explanation: ***The axillary tail of Spence crosses the anterior axillary fold*** - The **axillary tail of Spence** is an extension of breast glandular tissue that passes superolaterally from the main breast body and often **penetrates the deep fascia** in the axilla [3]. - Its presence crossing the **anterior axillary fold** is relevant for physical examination and surgical considerations, as it can be a site for breast pathologies. *The superior medial quadrant has more tissue* - The **superior lateral quadrant** of the breast typically contains the **most glandular tissue** and lymphatics, making it the most common site for breast cancers. - This anatomical distribution is crucial for understanding the **etiology and metastasis** of breast malignancies. *The nipple is located at the level of the fourth intercostal space in most women* - The **nipple** typically lies at the level of the **fourth rib (not intercostal space)** in nulliparous women, but its position can vary significantly based on individual factors like breast size, age, and parity [1]. - Topographical landmarks such as the **midclavicular line** are often used for more consistent localization. *There are 15-20 lobules present* - Each breast typically contains **15-20 lobes**, not lobules, arranged radially around the nipple [1]. - Each **lobe** consists of numerous smaller **lobules**, which are the functional units of milk production, draining into ducts that converge at the nipple [2].
Question 2: Which of the following glands is NOT involved in Type I MEN?
- A. Parathyroid
- B. Adrenal (Correct Answer)
- C. Pituitary
- D. Pancreas
Explanation: ***Adrenal*** - The **adrenal glands** are predominantly involved in **Multiple Endocrine Neoplasia type 2 (MEN2)**, particularly with pheochromocytomas, rather than MEN type 1. - While adrenal lesions (e.g., adenomas, hyperplasia) can occur sporadically or rarely in MEN1, they are not considered a primary or core component of the MEN1 syndrome as defined by the classic "3 Ps." [1] *Pancreas* - The **pancreas** is a primary gland involved in MEN1, frequently developing **neuroendocrine tumors** (e.g., gastrinomas, insulinomas). - These pancreatic tumors are a major cause of morbidity and mortality in MEN1 patients. *Pituitary* - The **pituitary gland** is one of the classic "3 P's" involved in MEN1, commonly developing **adenomas**, especially **prolactinomas**. [1] - These pituitary tumors can cause hormonal imbalances and mass effects within the sella turcica. *Parathyroid* - The **parathyroid glands** are almost universally involved in MEN1, with **hyperplasia** leading to **primary hyperparathyroidism**. [1] - This is often the earliest and most common clinical manifestation of MEN1.
Question 3: All of the following can result in gynecomastia except:
- A. Spironolactone
- B. Digoxin
- C. Aromatase inhibitors (Correct Answer)
- D. Sulphonamides
Explanation: ***Aromatase inhibitors*** - **Aromatase inhibitors** block the conversion of androgens to estrogens, thereby **decreasing estrogen levels** which would prevent rather than cause gynecomastia. - They are used in estrogen-sensitive breast cancers to reduce estrogen-dependent growth. *Spironolactone* - **Spironolactone** is an aldosterone antagonist that also possesses anti-androgenic effects and can inhibit androgen synthesis, leading to an **increased estrogen-to-androgen ratio** and gynecomastia. - It can also directly stimulate the estrogen receptor in male breast tissue. *Sulphonamides* - Certain **sulphonamides**, particularly sulfasalazine, have been associated with gynecomastia, possibly due to direct toxic effects on testicular function leading to a **relative increase in estrogen activity**. - While less common than with some other drugs, it can alter the estrogen-androgen balance. *Digoxin* - **Digoxin** can cause gynecomastia by mimicking estrogen physiologically or by inhibiting androgen production, leading to an **alteration in the estrogen-to-androgen ratio**. - The risk of gynecomastia is especially noted with prolonged use and higher doses of digoxin.
Question 4: In which of the following types of breast carcinoma would you consider a biopsy of the opposite breast?
- A. Lobular carcinoma (Correct Answer)
- B. Comedo carcinoma
- C. Medullary carcinoma
- D. Adenocarcinoma-poorly differentiated
Explanation: ***Lobular carcinoma*** - **Invasive lobular carcinoma (ILC)** is known for its **multicentricity** (multiple foci within the same breast) and a higher incidence of **bilateral involvement** compared to other breast cancer types. - Due to its infiltrating growth pattern without significant desmoplasia, ILC can be **clinically subtle** and difficult to detect by imaging, thus biopsy of the contralateral breast may be considered if there are any suspicious findings. *Comedo carcinoma* - This is a subtype of **ductal carcinoma in situ (DCIS)** characterized by central necrosis, calcifications, and high-grade nuclei confined to the ducts. - While DCIS can recur or progress, its primary concern is typically within the affected breast, and it does not inherently carry a significantly increased risk of contralateral involvement requiring routine biopsy. *Medullary carcinoma* - **Medullary carcinoma** is a rare subtype of invasive ductal carcinoma known for its distinct histological features, including a pushing border, prominent lymphocytic infiltrate, and high-grade nuclei. - It generally has a **better prognosis** than other invasive ductal carcinomas and does not have a characteristically high incidence of bilateral involvement that would routinely warrant a contralateral breast biopsy. *Adenocarcinoma-poorly differentiated* - This term describes an **invasive ductal carcinoma** with a high histologic grade, indicating aggressive features and poor differentiation. - While any invasive breast cancer carries some risk of bilateral disease, poorly differentiated adenocarcinoma does not have the uniquely high predisposition for **contralateral synchronous or metachronous disease** that is characteristic of lobular carcinoma.
Question 5: Mammography can be best used in?
- A. Early breast carcinoma (Correct Answer)
- B. Mastitis
- C. Fibroadenoma
- D. Phylloides tumor
Explanation: ***Early breast carcinoma*** - **Mammography** is the gold standard for **early detection of breast carcinoma**, particularly for identifying **microcalcifications** and small masses before they are palpable. - It plays a crucial role in **screening asymptomatic women** to reduce breast cancer mortality. *Mastitis* - **Mastitis** is an **inflammatory condition** of the breast, often associated with infection, which is usually diagnosed clinically. - While mammography might show diffuse **increased density**, it is not the primary diagnostic tool and often has limited value due to inflammatory changes masking pathology. *Fibroadenoma* - **Fibroadenomas** are **benign breast tumors** common in younger women, typically appearing as well-circumscribed masses on mammography. - While mammography can detect them, their characterization often requires **ultrasound** and **biopsy** for definitive diagnosis, as differentiation from malignant lesions can be challenging. *Phylloides tumor* - A **Phylloides tumor** is a rare tumor that can be benign, borderline, or malignant, and it typically presents as a rapidly growing, palpable mass. - Mammography may show a well-defined mass, but **ultrasound** and **core needle biopsy** are essential for accurate diagnosis and distinction from fibroadenomas or malignancy.
Question 6: Lesions affecting the terminal duct lobular unit (TDLU) in breast are all except
- A. Intraductal papilloma
- B. Fibroadenoma
- C. Blunt duct adenosis
- D. Nipple adenoma (Correct Answer)
Explanation: ***Nipple adenoma*** - **Nipple adenomas** (or florid papillomatosis of the nipple) are uncommon benign epithelial proliferations that specifically originate from the **major lactiferous ducts in the nipple**. - They do **NOT** arise from the **terminal duct lobular unit (TDLU)**, which is the functional unit of the breast parenchyma located peripherally in the breast tissue. - This makes nipple adenoma the correct answer to this "EXCEPT" question. *Intraductal papilloma* - **Intraductal papillomas** can be classified as central (large duct) or peripheral types. - While large solitary papillomas arise from major ducts, **peripheral/multiple papillomas** commonly involve the **smaller ducts and TDLU**. - In the context of breast pathology classification, papillomas are generally considered among lesions that can affect the **TDLU and ductal system**. - They are characterized by **papillary growths** [1] with fibrovascular cores within the ductal lumen. *Fibroadenoma* - **Fibroadenomas** are biphasic benign tumors that classically arise from the **terminal duct lobular unit (TDLU)** [3]. - They result from proliferation of both the **stromal and epithelial components** within the TDLU [3]. - This is the most common benign breast tumor in young women. *Blunt duct adenosis* - **Blunt duct adenosis** is a benign proliferative lesion characterized by an increase in the number of **small ducts and acini within the lobules**, which are components of the TDLU [2]. - It represents proliferation of the **glandular tissue** arising from the TDLU. - It is commonly seen as part of **fibrocystic changes** of the breast [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, pp. 1052-1054. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 445-446. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 448-449.
Question 7: Which of the following cancers is least associated with BRCA2 mutations?
- A. Breast cancer
- B. Prostate cancer
- C. Ovarian cancer
- D. Vulval cancer (Correct Answer)
Explanation: ***Vulval cancer*** - While there may be some rare, sporadic cases, **vulval cancer** is generally not considered a primary cancer with a strong, well-established association with **BRCA2 mutations**. - Its etiology is more commonly linked to **HPV infection** and other risk factors not directly related to hereditary breast and ovarian cancer syndromes. *Breast cancer* - **BRCA2 mutations** are strongly associated with an increased lifetime risk of developing **breast cancer**, particularly for **male breast cancer**. - These mutations impair DNA repair mechanisms, leading to genomic instability that can result in cancerous transformation of breast tissue. *Prostate cancer* - Men with **BRCA2 mutations** have a significantly elevated risk of developing **prostate cancer**, often at an earlier age and with a more aggressive phenotype. - This association is well-documented, making BRCA2 testing relevant in high-risk prostate cancer populations. *Ovarian cancer* - **BRCA2 mutations** are a significant risk factor for **ovarian cancer**, particularly **high-grade serous ovarian cancer**. - The risk is substantial, though generally lower than that conferred by BRCA1 mutations for ovarian cancer in particular.
Question 8: Best investigation to detect rupture of silicone breast implants is-
- A. Mammography
- B. X-ray
- C. MRI (Correct Answer)
- D. USG
Explanation: ***MRI*** - **Magnetic Resonance Imaging (MRI)** is considered the **gold standard** for detecting silicone breast implant ruptures due to its superior soft tissue contrast and ability to differentiate silicone from other tissues. - It can accurately identify both **intracapsular** (linguine sign) and **extracapsular** ruptures, as well as associated silicone granulomas. *Mammography* - While useful for breast cancer screening, **mammography** has limited sensitivity for detecting silicone implant ruptures, especially subtle ones. - It can show indirect signs like implant contour abnormalities or increased implant density but is often inconclusive for rupture diagnosis. *X-ray* - **X-rays** provide very little information regarding the integrity of silicone breast implants because silicone is radiolucent and does not show up clearly on standard radiographs. - Its utility is primarily for detecting calcifications or foreign bodies, not implant rupture. *USG* - **Ultrasound (USG)** can be a useful initial screening tool for detecting implant ruptures, showing signs like the **"stepladder sign"** for intracapsular rupture or anechoic collections (silicone outside the capsule). - However, its accuracy is highly operator-dependent, and it may miss subtle ruptures or be limited by poor visualization due to scar tissue, making MRI a more definitive choice.
Question 9: Which of the following is the most sensitive investigation for ductal carcinoma in situ (DCIS) of the breast?
- A. PET Scan
- B. Ultrasound
- C. Mammography (Correct Answer)
- D. MRI
Explanation: ***Mammography*** - **Mammography** is the **gold standard** and **primary imaging modality** for detecting **ductal carcinoma in situ (DCIS)**, primarily because it excels at visualizing **microcalcifications**, which are the hallmark of DCIS. - Approximately **80-90% of DCIS cases** present as **microcalcifications** on mammograms, making it the most important screening and diagnostic tool. - Mammography has **high sensitivity (85-95%)** for detecting DCIS, especially calcified forms, and is widely available and cost-effective. *MRI* - While **MRI** has high sensitivity for invasive breast cancer and can detect non-calcified DCIS, it is **not the primary screening tool** for DCIS detection. - MRI is typically used for **staging known DCIS**, evaluating **extent of disease**, detecting **additional foci**, and screening **high-risk patients**. - However, MRI has lower specificity and higher false-positive rates compared to mammography, limiting its use as a primary diagnostic tool. *PET Scan* - **PET scans** are generally **not sensitive** for detecting **DCIS** because DCIS lesions typically have a **low metabolic rate** and do not avidly take up the **FDG tracer**. - PET scans are primarily used for detecting **invasive cancers** and assessing **metastatic disease**, not for non-invasive lesions like DCIS. *Ultrasound* - **Ultrasound** has **limited sensitivity** for detecting **DCIS** because DCIS often does not present as a palpable mass or a distinct sonographic abnormality. - While ultrasound can be useful for evaluating palpable masses or guiding biopsies, it frequently **misses microcalcifications** that are characteristic of DCIS. - Ultrasound is mainly used as a **complementary tool** to mammography, not as a primary diagnostic modality for DCIS.
Question 10: 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.
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