Oncological Surgery Practice Questions

Q: Surgical treatment of anal canal carcinoma is largely replaced by what?

Nigro protocol. **Explanation:** Historically, the standard treatment for anal canal carcinoma (specifically Squamous Cell Carcinoma) was Abdominoperineal Resection (APR), which required a permanent colostomy. This has been largely replaced by the **Nigro Protocol**, which prioritizes organ preservation. **1. Why Nigro Protocol is Correct:** The Nigro Protocol is a definitive **chemoradiotherapy (CRT)** regimen consisting of 5-Fluorouracil (5-FU), Mitomycin-C, and external beam radiation. It achieves high rates of complete clinical remission (80-90%) while preserving the anal sphincter. Surgery is now reserved only for "salvage" (residual or recurrent disease). **2. Analysis of Incorrect Options:** * **UW Protocol:** Refers to the University of Wisconsin solution used for organ preservation during transplantation, not oncology. * **Mootz Protocol:** This is not a recognized standard oncological treatment for anal cancer. * **Williams Protocol:** While there are various "Williams" techniques in surgery (e.g., for bladder exstrophy), it is not a standard protocol for anal canal carcinoma. **Clinical Pearls for NEET-PG:** * **Anatomical Landmark:** The Nigro protocol is the gold standard for tumors arising **below** the pectinate line (Squamous Cell Carcinoma). * **Adenocarcinoma exception:** If the pathology is Adenocarcinoma (usually arising from the upper anal canal), the treatment follows rectal cancer guidelines (Surgery/TME). * **Staging:** MRI of the pelvis and PET-CT are the preferred modalities for staging and monitoring response. * **Salvage Surgery:** If the Nigro protocol fails, the procedure of choice is **Abdominoperineal Resection (APR)**.

Q: Sister Joseph Nodules are present at which location?

Umbilicus. **Explanation:** **Sister Mary Joseph’s Nodule (SMJN)** refers to a palpable, firm, and often painful nodule at the **umbilicus** (Option A) that represents cutaneous metastasis from an intra-abdominal or pelvic malignancy. **Why the Umbilicus is Correct:** The umbilicus is a unique anatomical site where several embryonic remnants and vascular/lymphatic channels converge. Malignant cells reach the umbilicus via: 1. **Contiguous spread** (peritoneal seeding). 2. **Lymphatic spread** (via axillary, inguinal, or internal mammary nodes). 3. **Venous spread** (via the portal system or paraumbilical veins). 4. **Remnants** of the urachus or vitelline duct. **Why Other Options are Incorrect:** * **B. Diaphragm:** While the diaphragm is a common site for peritoneal seeding (e.g., scalloping of the liver in pseudomyxoma peritonei), it does not present as a "nodule" named after Sister Joseph. * **C & D. Lung and Liver:** These are common sites for visceral hematogenous metastasis. While they may harbor secondary deposits, they are internal organs and do not present as the classic superficial umbilical sign. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Source:** The most common primary site is **Stomach** (in men) and **Ovary** (in women). Other sources include the pancreas and colon. * **Significance:** Its presence usually indicates **advanced stage (Stage IV)** disease and carries a poor prognosis. * **Historical Fact:** Named after Sister Mary Joseph Dempsey, the surgical assistant to Dr. William Mayo, who first noticed the correlation between these nodules and intra-abdominal cancer. * **Differential Diagnosis:** Must be distinguished from an umbilical hernia or a primary umbilical tumor (e.g., melanoma).

Q: Sentinel node biopsy for breast cancer is performed for what purpose?

Staging the tumour. **Explanation:** **Sentinel Lymph Node Biopsy (SLNB)** is the standard of care for axillary evaluation in patients with clinically node-negative (cN0) breast cancer. 1. **Why "Staging the tumour" is correct:** The status of the axillary lymph nodes is the most important prognostic factor in early breast cancer. SLNB identifies the "sentinel node"—the first node(s) to receive lymphatic drainage from the primary tumor. If this node is negative, the rest of the axilla is likely negative, allowing the surgeon to avoid a morbid Axillary Lymph Node Dissection (ALND). Thus, SLNB is used for **pathological nodal staging (pN)** within the TNM classification system. 2. **Why other options are incorrect:** * **A. Early diagnosis:** Diagnosis is confirmed via Triple Assessment (Clinical exam, Imaging, and Core Needle Biopsy of the breast mass), not by sampling lymph nodes. * **C. Frozen section:** This is a *technique* used intraoperatively to analyze the node, but it is not the *purpose* of the biopsy itself. * **D. Detection of occult disease:** While SLNB can find micrometastases, its primary clinical utility in the surgical algorithm is to determine the stage to guide further treatment (chemotherapy/radiotherapy). **High-Yield Clinical Pearls for NEET-PG:** * **Tracers used:** Technetium-99m labeled sulfur colloid (radioactive) and/or Isosulfan blue/Methylene blue dye. * **Identification:** The "Hot" node (gamma probe) or "Blue" node. * **Indication:** T1-T2 tumors with clinically negative axilla. * **Contraindications:** Inflammatory breast cancer, clinically positive nodes (cN1), and large multicentric tumors (relative). * **The "10% Rule":** Any node with radioactivity ≥10% of the hottest node should be excised.

Q: A female presents with a breast lump of size 6 cm. On examination, ipsilateral axillary lymph nodes are found to be enlarged and fixed. What is the TNM staging?

T3 N2. ### Explanation The TNM staging system for breast cancer is a cornerstone of surgical oncology. To solve this question, we must break down the clinical findings based on the AJCC 8th Edition criteria. **1. Tumor (T) Staging:** The size of the lump is **6 cm**. * T1: ≤ 2 cm * T2: > 2 cm but ≤ 5 cm * **T3: > 5 cm** * T4: Any size with extension to the chest wall or skin (edema/ulceration). Since the lump is 6 cm, it is classified as **T3**. **2. Node (N) Staging:** The examination reveals **ipsilateral axillary lymph nodes** that are **fixed** to one another or to other structures. * N1: Movable ipsilateral axillary lymph nodes. * **N2: Ipsilateral axillary lymph nodes that are fixed** or matted. * N3: Metastasis in ipsilateral infraclavicular, internal mammary, or supraclavicular nodes. The presence of fixed nodes confirms **N2**. **Conclusion:** Combining these gives **T3 N2**. --- ### Why Other Options are Incorrect: * **B (T2 N2):** Incorrect because T2 is limited to tumors ≤ 5 cm. * **C (T4 N2):** Incorrect because T4 requires involvement of the chest wall (Serratus anterior/Ribs) or skin (Peau d'orange/Ulceration). Size alone does not make a tumor T4. * **D (T1 N1):** Incorrect as T1 is ≤ 2 cm and N1 implies movable (not fixed) nodes. --- ### NEET-PG High-Yield Pearls: * **T4 Classification:** Note that involvement of the Pectoralis major muscle alone does **not** constitute T4; it must involve the chest wall (ribs, intercostals, or serratus anterior). * **Inflammatory Carcinoma:** This is clinically diagnosed and automatically staged as **T4d**. * **Dimpling vs. Peau d'orange:** Skin dimpling (tethering) is due to Cooper’s ligament involvement and does not change the T stage, whereas Peau d'orange (dermal lymphatic edema) signifies T4.

Q: A patient with oral cancer involving the mandible is managed by which of the following treatment modalities?

Resection followed by radiotherapy. **Explanation:** The management of oral cancer depends on the stage and the involvement of adjacent structures. When oral cancer involves the **mandible**, it is classified as T4a disease (locally advanced). **1. Why Option C is Correct:** The standard of care for locally advanced oral squamous cell carcinoma (OSCC) with bone involvement is **upfront surgical resection** (composite resection/commando operation) with adequate margins. Bone involvement is a poor prognostic factor and a high-risk feature. Therefore, surgery is followed by **Adjuvant Radiotherapy (RT)** or Chemoradiotherapy (CRT) to eliminate microscopic residual disease and reduce the risk of local recurrence. **2. Why other options are incorrect:** * **Options A & B:** Chemotherapy or Radiotherapy alone are rarely curative for T4 lesions. Furthermore, radiotherapy is less effective when there is gross bone invasion because the hypoxic environment of the bone limits the efficacy of radiation, and there is a high risk of **osteoradionecrosis** if high doses are used on an involved mandible. * **Option D:** Neoadjuvant radiotherapy (RT before surgery) is generally avoided in the oral cavity as it increases surgical complications, impairs wound healing (especially for flaps), and delays definitive surgical clearance. **Clinical Pearls for NEET-PG:** * **Mandibular Involvement:** If the tumor is close to the bone but not invading the cortex, a **marginal mandibulectomy** is done. If the marrow is involved, a **segmental mandibulectomy** is required. * **Indications for Adjuvant RT:** T3/T4 stage, positive/close margins, perineural invasion (PNI), or lymphovascular invasion (LVI). * **Indications for Adjuvant CRT:** The "Gold Standard" for adding chemotherapy to radiation post-surgery is the presence of **Extracapsular Spread (ECS)** in lymph nodes or **positive surgical margins**.

Q: In which of the following head and neck cancers is lymph node metastasis least common?

Hard palate. **Explanation:** The frequency of cervical lymph node metastasis in oral cavity cancers is primarily determined by the density of the lymphatic network and the muscularity of the site. **Why Hard Palate is Correct:** The **hard palate** and the **upper maxillary alveolus** have a sparse lymphatic network and are composed of mucoperiosteum tightly bound to bone. Due to this anatomical lack of deep muscle involvement and low lymphatic density, the incidence of clinically positive nodes at presentation is the lowest among oral cavity sites (approx. 10–15%). **Analysis of Incorrect Options:** * **Tongue (Option A):** The tongue is highly muscular and has a rich, decussating lymphatic plexus. It has the **highest rate** of early lymphatic spread (often bilateral), with up to 40–50% of patients presenting with nodal disease. * **Buccal Mucosa (Option B):** This site is rich in lymphatics that drain into the submandibular (Level II) and facial nodes. It has a significantly higher metastatic potential than the hard palate. * **Lower Alveolus (Option D):** While the gingiva itself has modest lymphatics, tumors here frequently invade the underlying floor of the mouth or the mylohyoid muscle, leading to early involvement of Level I and II nodes. **Clinical Pearls for NEET-PG:** * **Most common site of Oral Cancer:** Lower lip (Global); Tongue/Buccal Mucosa (India). * **Highest risk of Nodal Metastasis:** Tongue and Floor of Mouth. * **Lowest risk of Nodal Metastasis:** Hard palate and Upper Alveolus. * **Nodal Levels:** Oral cavity cancers typically drain first to **Level I (Submental/Submandibular)** and **Level II (Upper Jugular)** nodes. * **Skip Metastasis:** Characteristically seen in Tongue cancers (nodes in Level III or IV involved without Level I or II).

Q: A 45-year-old chronic tobacco chewer presents with a 1.5 cm oral cavity mass and a single ipsilateral neck lymph node. What is the TNM stage of the tumor?

T1N1. **Explanation:** The staging of oral cavity squamous cell carcinoma follows the **AJCC 8th Edition TNM classification**. To determine the stage, we must analyze the primary tumor (T) and the regional lymph nodes (N) separately. 1. **T-Stage (Primary Tumor):** * **T1:** Tumor size ≤ 2 cm and Depth of Invasion (DOI) ≤ 5 mm. * **T2:** Tumor size ≤ 2 cm with DOI > 5 mm OR tumor size 2–4 cm with DOI ≤ 10 mm. * In this case, the mass is **1.5 cm**, which falls under the **T1** category (assuming standard depth for a small lesion). 2. **N-Stage (Regional Lymph Nodes):** * **N1:** Metastasis in a **single ipsilateral** lymph node, **≤ 3 cm** in greatest dimension, and ENE (extranodal extension) negative. * The patient has a single ipsilateral node, making it **N1**. **Why the other options are incorrect:** * **T1N3:** N3 represents a node > 6 cm or any node with clinical extranodal extension. This is too advanced for a single node. * **T3N1:** T3 requires a tumor > 4 cm or DOI > 10 mm. A 1.5 cm mass does not meet this criteria. * **T2N2:** T2 requires a larger tumor size (2-4 cm). N2 involves multiple nodes, bilateral nodes, or a single node between 3–6 cm. **High-Yield Clinical Pearls for NEET-PG:** * **AJCC 8th Edition Update:** The most significant change in oral cavity staging is the inclusion of **Depth of Invasion (DOI)**, not just surface diameter. * **Most Common Site:** The lower lip is the most common site for oral cancer globally, but in India, the **buccal mucosa** (due to tobacco chewing) is most frequent. * **Nodal Level:** Oral cavity cancers typically spread first to **Level I, II, and III** neck nodes. * **Management:** T1N1 lesions are generally treated with wide local excision of the primary tumor and a neck dissection (usually Selective Neck Dissection).

Question 1

Surgical treatment of anal canal carcinoma is largely replaced by what?

Accepted Answer

Nigro protocol

Answer

UW protocol

Answer

Mootz protocol

Answer

Williams protocol

Question 2

Sister Joseph Nodules are present at which location?

Accepted Answer

Umbilicus

Answer

Diaphragm

Answer

Lung

Answer

Liver

Question 3

Sentinel node biopsy for breast cancer is performed for what purpose?

Accepted Answer

Staging the tumour

Answer

Early diagnosis of cancer

Answer

Frozen section

Answer

Detection of occult disease

Question 4

Which of the following is the most radiosensitive tumor?

Accepted Answer

Ewing's sarcoma

Answer

Hodgkin's disease

Answer

Carcinoma cervix

Answer

Malignant fibrous histiocytoma

Question 5

A female presents with a breast lump of size 6 cm. On examination, ipsilateral axillary lymph nodes are found to be enlarged and fixed. What is the TNM staging?

Accepted Answer

T3 N2

Answer

T2 N2

Answer

T4 N2

Answer

T1 N1

Question 6

What is the best treatment for a 2 cm thyroid nodule in a 50-year-old man, where Fine Needle Aspiration Cytology (FNAC) reveals papillary carcinoma?

Accepted Answer

Total thyroidectomy with left sided modified neck dissection

Answer

Hemithyroidectomy

Answer

Near total thyroidectomy with radiotherapy

Answer

Hemithyroidectomy with modified neck dissection

Question 7

A patient with oral cancer involving the mandible is managed by which of the following treatment modalities?

Accepted Answer

Resection followed by radiotherapy

Answer

Chemotherapy alone

Answer

Radiotherapy alone

Answer

Radiotherapy followed by resection

Question 8

What is the treatment of choice for Stage I seminoma?

Accepted Answer

High inguinal orchidectomy and radiotherapy

Answer

High inguinal orchidectomy

Answer

Radiotherapy and chemotherapy

Answer

Trans-scrotal orchidectomy

Question 9

In which of the following head and neck cancers is lymph node metastasis least common?

Accepted Answer

Hard palate

Answer

Tongue

Answer

Buccal mucosa

Answer

Lower alveolus

Question 10

A 45-year-old chronic tobacco chewer presents with a 1.5 cm oral cavity mass and a single ipsilateral neck lymph node. What is the TNM stage of the tumor?

Accepted Answer

T1N1

Answer

T1N3

Answer

T3N1

Answer

T2N2

Oncological Surgery — MCQs

Oncological Surgery — MCQs

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