Surgical Margins in Cancer Surgery — MCQs
Identify the marked structure in the given image.
Arrange the following in sequential order with regards to the steps of collection of samples for pap smear testing: Use posterior vaginal wall retractor Take the sample Make smear on a slide Fix the smear
Which of the following is the platinum-based chemotherapeutic agent used as first-line treatment for ovarian carcinoma?
Gold standard investigation for breast carcinoma screening in a patient with silicone breast implants
In which of the following situations is breast conservation surgery not indicated?
Primary treatment for localized malignant melanoma is
Which of the following stages of lip carcinoma does not have nodal involvement?
Management of RCC less than 4 cm in size:
Best treatment strategy for carcinoma of the anal canal:
Most radiosensitive tumor of the following is?
Surgical Margins in Cancer Surgery Indian Medical PG Practice Questions and MCQs
Question 1: Identify the marked structure in the given image.
- A. Electrode
- B. Coil (Correct Answer)
- C. Magnet
- D. Processor
Explanation: ***Coil*** - The marked structure appears to be a **cochlear implant's internal coil**, which is common in X-ray imaging of these devices. - The **cochlear implant internal coil** is crucial for transmitting processed sound signals via electromagnetic induction to the electrode array within the cochlea. *Electrode* - An **electrode array** is typically a thin, flexible wire with multiple contacts inserted into the cochlea, which is not what the arrow is pointing to directly. - While electrodes are part of a cochlear implant, the marked structure's shape and position are more consistent with the **internal coil** that connects to the electrode array. *Magnet* - A **magnet** is present in a cochlear implant system, typically in both the external processor and internal receiver, to hold these two components together through the skin. - Magnets usually appear as dense, circular structures in X-rays, often seen more anteriorly or superiorly to the coil for external component alignment. *Processor* - The **processor** for a cochlear implant is an external device worn behind the ear, not an implanted component visible on an X-ray. It processes sound and sends it to the internal coil. - The structures seen in the X-ray are **implanted components** of the cochlear implant, not the external sound processor.
Question 2: Arrange the following in sequential order with regards to the steps of collection of samples for pap smear testing: Use posterior vaginal wall retractor Take the sample Make smear on a slide Fix the smear
- A. 1,2,4,3
- B. 3,1,2,4
- C. 1,2,3,4 (Correct Answer)
- D. 2,1,3,4
Explanation: ***1,2,3,4*** - The correct sequence for collecting a Pap smear involves first **visualizing the cervix** using a posterior vaginal wall retractor, then **taking the sample** (e.g., using a broom or spatula and brush), followed by **making a smear on a slide** and finally **fixing the smear** to preserve the cells. - This sequential order ensures proper cell collection and preservation for accurate cytological examination. *1,2,4,3* - This option incorrectly places **fixing the smear** before **making the smear on the slide**. Cells must first be spread onto the slide before they can be fixed. - Fixing an un-smeared sample or attempting to smear after fixing would lead to an inadequate or damaged specimen. *3,1,2,4* - This sequence incorrectly starts with **making a smear on a slide** before any sample has been collected or the cervix visualized. - One cannot make a smear without first taking a sample and accessing the cervix via a retractor. *2,1,3,4* - This option incorrectly states that **taking the sample** occurs before **using a posterior vaginal wall retractor**. The retractor is essential for proper visualization and access to the cervix to obtain a quality sample. - Attempting to take a sample without proper visualization would lead to an inadequate or incorrect specimen collection.
Question 3: Which of the following is the platinum-based chemotherapeutic agent used as first-line treatment for ovarian carcinoma?
- A. Cyclophosphamide
- B. Methotrexate
- C. Cisplatin (Correct Answer)
- D. Dacarbazine
Explanation: ***Cisplatin*** - **Cisplatin** is a platinum-based chemotherapy drug that forms **DNA cross-links**, inhibiting DNA synthesis and leading to the death of rapidly dividing cells, making it highly effective against **ovarian carcinoma**. - It is a cornerstone of chemotherapy regimens for ovarian cancer, often used in combination with other agents such as paclitaxel. *Methotrexate* - **Methotrexate** is an **antimetabolite** that inhibits dihydrofolate reductase, thereby interfering with DNA synthesis. - While it is used in various cancers like leukemia, lymphoma, and some solid tumors (e.g., breast cancer, gestational trophoblastic disease), it is **not a primary recommended drug for ovarian carcinoma**. *Cyclophosphamide* - **Cyclophosphamide** is an **alkylating agent** that causes DNA damage, leading to cell death. - It is used in many cancers, including lymphoma, breast cancer, and some leukemias, but it is **not a first-line or primary agent for ovarian carcinoma** in contemporary treatment guidelines. *Dacarbazine* - **Dacarbazine** is an **alkylating agent** primarily used in the treatment of **malignant melanoma** and Hodgkin lymphoma. - It is **not indicated for the treatment of ovarian carcinoma**.
Question 4: Gold standard investigation for breast carcinoma screening in a patient with silicone breast implants
- A. Mammography
- B. CT scan
- C. USG
- D. MRI (Correct Answer)
Explanation: ***MRI*** - **MRI** is considered the **gold standard** for breast cancer screening in patients with silicone breast implants due to its superior ability to visualize breast tissue through the implant and detect subtle lesions. - It offers **high sensitivity** in detecting both implant rupture and early malignancies, often providing better clarity than mammography in augmented breasts where implants can obscure tissue. *Mammography* - While a standard screening tool, **mammography** can be limited in patients with silicone implants because the implants can **obscure adjacent breast tissue**, making detection of small masses challenging. - Special views (e.g., **Eklund views**) can be used, but sensitivity is still reduced compared to MRI in augmented breasts. *CT scan* - **CT scans** are not routinely used for primary breast cancer screening due to their use of **ionizing radiation** and lower sensitivity for detecting early breast lesions compared to MRI. - CT is more commonly used for **staging** advanced cancers or evaluating complex masses detected by other modalities. *USG* - **Ultrasound (USG)** is a valuable complementary tool, especially for evaluating palpable lumps or clarifying findings from mammography, but it is **operator-dependent** and has a lower overall sensitivity for general screening compared to MRI. - It is particularly useful for differentiating between **cystic and solid masses** and detecting implant ruptures but is not the gold standard for comprehensive screening in augmented breasts.
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: Primary treatment for localized malignant melanoma is
- A. Wide excision (Correct Answer)
- B. Radiotherapy
- C. Excision
- D. Chemotherapy
Explanation: ***Wide excision*** - This is the **primary treatment** for localized malignant melanoma, aiming to completely remove the tumor along with a surrounding margin of healthy tissue to reduce recurrence risk. - The excisional margin width depends on the **Breslow depth** (tumor thickness). *Radiotherapy* - Not the primary treatment for localized melanoma, as melanoma cells are often **radioresistant**. - It may be used as **adjuvant therapy** for local control in cases of positive margins or nodal involvement, or for palliative care in metastatic disease. *Excision* - While excision is part of the treatment, the term **"wide excision"** specifically implies removing a sufficient margin of healthy tissue around the tumor. - Simple excision without appropriate margins is generally inadequate for malignant melanoma and carries a **high risk of local recurrence**. *Chemotherapy* - It is generally **not the first-line treatment** for localized melanoma due to limited efficacy and significant side effects. - Chemotherapy agents are typically reserved for **advanced or metastatic melanoma** and are often replaced by targeted therapies or immunotherapy in modern practice.
Question 7: Which of the following stages of lip carcinoma does not have nodal involvement?
- A. T2N1
- B. T3N0 (Correct Answer)
- C. T2N2
- D. T1N1
Explanation: ***T3N0*** - The **'N' classification** in the TNM staging system refers to **nodal involvement**. A stage with **'N0' indicates no regional lymph node metastasis**. - A **T3 lesion** signifies a large primary tumor, but if it's accompanied by **N0**, it means there's no evidence of spread to the lymph nodes. *T2N1* - The **'N1' classification** indicates the presence of **regional lymph node metastasis**, specifically in a **single ipsilateral lymph node** that is 3 cm or less in its greatest dimension. - This stage therefore **does have nodal involvement**, contradicting the premise of the question. *T2N2* - The **'N2' classification** signifies more advanced regional lymph node metastasis, such as a **single ipsilateral lymph node** greater than 3 cm but not more than 6 cm. - It could also refer to **multiple ipsilateral lymph nodes**, none greater than 6 cm, or bilateral/contralateral lymph nodes, none greater than 6 cm. In all these cases, **nodal involvement is present**. *T1N1* - Similar to T2N1, the **'N1' component** in T1N1 indicates the presence of **regional lymph node metastasis** in a single ipsilateral lymph node of 3 cm or less. - Therefore, this stage **does involve nodal spread**, despite having a smaller primary tumor (T1).
Question 8: Management of RCC less than 4 cm in size:
- A. Surgery followed by chemotherapy
- B. Partial nephrectomy (Correct Answer)
- C. Radical nephrectomy
- D. Chemotherapy
Explanation: ***Correct: Partial nephrectomy*** - For **renal cell carcinoma (RCC) less than 4 cm (T1a)**, partial nephrectomy is the **gold standard** as it offers equivalent oncological outcomes to radical nephrectomy while preserving renal function. - This approach minimizes the risk of **chronic kidney disease** and its associated complications without compromising cancer control for appropriately selected smaller tumors. - **Nephron-sparing surgery** is now the preferred approach per EAU and AUA guidelines for small renal masses. *Incorrect: Surgery followed by chemotherapy* - While surgery is the primary treatment, **adjuvant chemotherapy** is generally **not effective** for localized RCC and is not routinely recommended for small tumors. - Systemic therapies are typically reserved for **advanced or metastatic RCC**, or in specific clinical trials. *Incorrect: Radical nephrectomy* - This involves removing the entire kidney, which is typically reserved for **larger tumors (T1b and above)**, centrally located tumors, or those with significant renal parenchymal involvement. - For tumors under 4 cm, radical nephrectomy leads to **unnecessary loss of renal function** compared to partial nephrectomy. *Incorrect: Chemotherapy* - **RCC is notoriously chemoresistant**, meaning traditional chemotherapy drugs have very limited efficacy in treating this cancer. - Chemotherapy alone is **not a primary treatment modality** for localized RCC due to its poor response rates in this cancer type.
Question 9: Best treatment strategy for carcinoma of the anal canal:
- A. Chemoradiation (Correct Answer)
- B. Radiation
- C. Surgery
- D. Chemotherapy
Explanation: ***Chemoradiation*** - Carcinoma of the anal canal is primarily treated with **chemoradiation** (combinations of chemotherapy and radiation therapy) as the standard of care to achieve **organ preservation**. - This combined approach improves local control and survival rates compared to either modality alone, making it the **primary curative strategy** for most localized anal canal cancers. *Radiation* - While radiation therapy is a crucial component of anal canal cancer treatment, using it alone (**monotherapy**) is generally less effective than chemoradiation. - **Local recurrence rates** are higher with radiation alone compared to combined modality treatment. *Surgery* - Surgery, specifically **abdominoperineal resection (APR)**, is typically reserved for **recurrent disease** or cases where chemoradiation fails. - Initial radical surgery for anal canal cancer leads to significant morbidity (e.g., permanent colostomy) and is generally avoided as a primary treatment due to the success of chemoradiation. *Chemotherapy* - Chemotherapy alone is **not curative** for localized anal canal carcinoma. - It is primarily used in combination with radiation (chemoradiation) to sensitize the tumor to radiation and improve local control, or as treatment for **metastatic disease**.
Question 10: Most radiosensitive tumor of the following is?
- A. Melanoma
- B. Thyroid carcinoma
- C. Renal cell carcinoma
- D. Dysgerminoma (Correct Answer)
Explanation: ***Dysgerminoma*** - **Dysgerminomas** are highly **radiosensitive germ cell tumors**, making radiation therapy an effective treatment option, particularly for localized disease or residual masses after chemotherapy. - This high sensitivity is attributed to the tumor cells' **undifferentiated nature** and rapid proliferation. *Melanoma* - **Melanoma** is generally considered a **radioresistant** tumor, meaning high doses of radiation are often required to achieve local control. - Its resistance is thought to be due to efficient DNA repair mechanisms and intrinsic cellular resistance. *Thyroid carcinoma* - While some forms of thyroid carcinoma, particularly **papillary and follicular thyroid cancer**, are treatable with **radioactive iodine (I-131)**, this is a very specific type of internal radiation. - **External beam radiotherapy** is typically reserved for aggressive, anaplastic, or recurrent thyroid cancers that do not respond to I-131, and these forms are often less radiosensitive than dysgerminoma. *Renal cell carcinoma* - **Renal cell carcinoma (RCC)** is largely considered to be **radioresistant**, with radiation therapy playing a limited role in primary treatment. - Radiation is primarily used for **palliative care** to manage symptoms like bone pain or for local control of metastatic disease.
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