Oncological Surgery Practice Questions

Q: Papillary carcinoma of the thyroid primarily spreads via which route?

Lymphatic. **Explanation:** **1. Why Lymphatic is Correct:** Papillary Thyroid Carcinoma (PTC) is the most common type of thyroid malignancy. Its hallmark characteristic is a strong predilection for **lymphatic spread**. Approximately 50-80% of patients have microscopic cervical lymph node involvement at the time of diagnosis. It typically spreads to the central compartment (Level VI) first, followed by the lateral neck nodes (Levels II-V). This occurs because the tumor cells easily invade the rich lymphatic network of the thyroid gland. **2. Why Other Options are Incorrect:** * **Hematogenous:** While PTC can spread via the blood, this is **rare** (seen in <5% of cases) and usually occurs late in the disease, primarily to the lungs and bones. In contrast, **Follicular Carcinoma** is the thyroid malignancy known for early hematogenous spread. * **Local Spread:** While PTC can invade the thyroid capsule and adjacent structures (like the trachea or recurrent laryngeal nerve), this is a feature of advanced T4 disease rather than the primary mode of metastasis. * **All of the Above:** Although all routes are theoretically possible, the question asks for the *primary* route. Lymphatic spread is the defining metastatic pathway for PTC. **3. High-Yield Clinical Pearls for NEET-PG:** * **Psammoma Bodies:** These are pathognomonic laminated calcifications often seen in PTC (representing infarcted papillae). * **Orphan Annie Eye Nuclei:** A classic histological finding (large, pale, clear nuclei). * **Prognosis:** Despite frequent lymph node metastasis, PTC has an excellent 10-year survival rate (>90%). * **Risk Factor:** Prior exposure to ionizing radiation is the most significant risk factor. * **BRAF Mutation:** The V600E mutation is the most common genetic alteration in PTC and is associated with a higher risk of lymph node metastasis.

Q: Which of the following is a risk factor for breast carcinoma in women?

Consumption of fatty food. **Explanation:** The correct answer is **A. Consumption of fatty food.** **1. Why "Consumption of fatty food" is correct:** Dietary fat intake is a recognized modifiable risk factor for breast carcinoma. High fat consumption leads to obesity, particularly in postmenopausal women. Adipose tissue contains the enzyme **aromatase**, which converts peripheral androgens into **estrone** (a type of estrogen). Since breast cancer is frequently hormone-dependent, increased cumulative exposure to estrogen promotes the proliferation of mammary epithelium, thereby increasing the risk of malignancy. **2. Why the other options are incorrect:** * **B. Early menopause:** This is a protective factor. **Late menopause** (after age 55) is the actual risk factor because it extends the duration of the "estrogen window." * **C. Smoking:** While smoking is a major risk factor for many cancers (lung, bladder, head, and neck), its direct causal link to breast cancer is less established compared to hormonal and genetic factors. * **D. Multiple sexual partners:** This is a risk factor for **Cervical Cancer** due to increased exposure to Human Papillomavirus (HPV), but it has no association with breast cancer. **3. NEET-PG High-Yield Clinical Pearls:** * **The "Estrogen Window" Concept:** Anything that increases the number of menstrual cycles (Early menarche 55y, Nulliparity) increases breast cancer risk. * **Protective Factors:** Early pregnancy (<20 years), breastfeeding, and regular physical exercise. * **Genetic Risk:** BRCA1 (Chromosome 17) and BRCA2 (Chromosome 13) are the most significant genetic mutations. * **Atypical Hyperplasia:** Finding atypical ductal or lobular hyperplasia on biopsy increases risk by 4–5 times.

Q: What is the most common tumor found in the posterior mediastinum?

Neurofibroma. **Explanation:** The mediastinum is anatomically divided into compartments, each associated with specific pathologies. The **posterior mediastinum** is the space located between the pericardium and the spine. **Why Neurofibroma is correct:** The posterior mediastinum is primarily occupied by the paravertebral sulcus, which contains the spinal nerves and the sympathetic chain. Consequently, **neurogenic tumors** are the most common primary tumors found in this compartment (accounting for ~75% of posterior mediastinal masses). Among these, **Neurofibromas** and Neurilemmomas (Schwannomas) are the most frequent benign subtypes. In children, neuroblastoma is more common. **Why the other options are incorrect:** * **Lung cyst:** These are typically intrapulmonary or found in the middle mediastinum (e.g., bronchogenic cysts). * **Dermoid cyst:** These are germ cell tumors typically located in the **anterior mediastinum**. * **Thyroid mass:** Retrosternal goiters are almost exclusively found in the **superior or anterior mediastinum**. **Clinical Pearls for NEET-PG:** * **Anterior Mediastinum (The 4 Ts):** Thymoma (most common), Teratoma (Germ cell tumors), Thyroid (Ectopic/Goiter), and "Terrible" Lymphoma. * **Middle Mediastinum:** Most common site for lymphadenopathy and bronchogenic cysts. * **Posterior Mediastinum:** Most common site for neurogenic tumors. * **Dumbbell Tumor:** A classic presentation where a neurogenic tumor extends through the intervertebral foramen, causing both mediastinal and spinal cord compression.

Q: A 67-year-old retired judge is admitted to the emergency department with severe dyspnea after returning from vacation. On examination, inspiratory stridor, ecchymosis in his neck, and swelling of soft tissue and veins in his face and upper extremities are evident. The CT scan shows an expanding superior mediastinal hematoma. What is the most common source of mediastinal hemorrhage?

Trauma. **Explanation:** The clinical presentation of inspiratory stridor, neck ecchymosis, and Superior Vena Cava (SVC) syndrome-like symptoms (facial/upper extremity swelling) in the context of a superior mediastinal hematoma indicates acute compression of mediastinal structures. **1. Why Trauma is Correct:** Trauma is the **most common cause** of mediastinal hemorrhage. It typically results from rapid deceleration injuries (e.g., motor vehicle accidents) causing a blunt aortic injury (usually at the aortic isthmus) or fractures of the sternum and thoracic spine. The sudden accumulation of blood in the confined mediastinal space leads to "Mediastinal Syndrome," characterized by venous congestion and airway compression. **2. Analysis of Incorrect Options:** * **Parotid gland surgery (A):** This involves the facial and cervical regions. While it can cause local neck hematomas, it does not typically lead to superior mediastinal hemorrhage. * **Dissecting thoracic aneurysm (C):** While a life-threatening cause of mediastinal blood, it is statistically less common than trauma. It usually presents with "tearing" chest pain radiating to the back and asymmetric blood pressure, rather than isolated superior mediastinal symptoms. * **Mediastinal tumor (D):** Tumors (like thymomas or lymphomas) cause chronic SVC syndrome through gradual compression or invasion, but they rarely cause acute, massive hemorrhage unless there is a rare event like intratumoral bleeding. **Clinical Pearls for NEET-PG:** * **Imaging Gold Standard:** Contrast-Enhanced CT (CECT) is the investigation of choice for evaluating mediastinal hematomas and identifying the source (e.g., aortic tear). * **Radiological Sign:** On a plain Chest X-ray, a **widened mediastinum (>8 cm)** is the classic hallmark of mediastinal hemorrhage/aortic injury. * **Management:** Acute airway management is the priority if stridor is present, followed by surgical or endovascular repair of the vascular injury.

Q: Which of the following is NOT a risk factor for increased incidence of relapse in stage I carcinoma of the breast?

Decreased Her-2/neu oncogene expression. **Explanation:** In breast cancer management, prognostic factors are used to predict the risk of recurrence and guide adjuvant therapy. The question asks for the factor that is **NOT** associated with an increased risk of relapse. **1. Why Option D is Correct:** The **Her-2/neu (c-erbB2)** oncogene is a transmembrane tyrosine kinase receptor. **Increased expression (amplification)** of this gene is associated with aggressive tumor behavior, higher grade, and a significantly increased risk of relapse. Therefore, **decreased expression** would theoretically imply a better prognosis or a baseline risk, rather than an increased risk of relapse. **2. Analysis of Incorrect Options (Risk Factors for Relapse):** * **A. Negative ER/PR status:** Estrogen and Progesterone receptor-negative tumors are generally more aggressive, have a higher histological grade, and do not respond to endocrine therapies (like Tamoxifen), leading to a higher incidence of relapse. * **B. High S-phase fraction:** This is a measure of cellular proliferation (the percentage of cells replicating DNA). A high S-phase fraction indicates a rapidly dividing, aggressive tumor with a higher likelihood of recurrence. * **C. Aneuploidy:** DNA aneuploidy (abnormal amount of DNA) is a marker of genetic instability. Aneuploid tumors have a worse prognosis compared to diploid tumors in Stage I breast cancer. **Clinical Pearls for NEET-PG:** * **Most important prognostic factor** for breast cancer: Number of axillary lymph nodes involved. * **Most important prognostic factor in Node-Negative (Stage I) disease:** Tumor size. * **Triple Negative Breast Cancer (TNBC):** Lacks ER, PR, and Her-2 expression; carries the worst prognosis among molecular subtypes. * **Luminal A:** (ER/PR +, Her-2 -, low Ki-67) has the best prognosis.

Q: A 1 cm coin lesion is seen on chest X-ray in the right upper lobe. FNAC shows adenocarcinoma. What is the appropriate management?

Excision and observation. ### Explanation **Correct Answer: A. Excision and observation** The clinical scenario describes a **Stage IA1 Non-Small Cell Lung Cancer (NSCLC)**. A 1 cm lesion is classified as **T1a** (≤1 cm), and in the absence of lymphadenopathy or distant metastasis, it is Stage IA. **Why Option A is correct:** For early-stage NSCLC (Stage I and II), the primary treatment is surgical resection (Lobectomy with hilar/mediastinal lymph node dissection is the gold standard, though sub-lobar resection may be considered for lesions <2 cm). According to current oncological guidelines (NCCN/ASCO), **adjuvant chemotherapy is NOT indicated for Stage IA tumors.** These patients have a high cure rate with surgery alone; therefore, the management plan is surgical excision followed by observation (surveillance). **Why other options are incorrect:** * **Option B & D:** Adjuvant chemotherapy (with or without radiation) is generally reserved for **Stage II and IIIA** disease or Stage IB patients with high-risk features (e.g., tumors >4 cm, vascular invasion). For a 1 cm (Stage IA) lesion, the risks of chemotherapy toxicity outweigh the survival benefits. * **Option C:** Neoadjuvant chemotherapy is typically considered for **Stage IIIA (N2 disease)** to downstage the tumor before surgery. It is not indicated for a small, localized 1 cm coin lesion. **Clinical Pearls for NEET-PG:** 1. **Staging Cut-offs:** T1a (≤1 cm), T1b (>1 to 2 cm), T1c (>2 to 3 cm). 2. **Adjuvant Chemotherapy Rule:** It is indicated for tumors **>4 cm (Stage IB)** or if there is **node-positive disease (Stage II/III)**. 3. **Solitary Pulmonary Nodule (SPN):** A "coin lesion" is an SPN. If malignancy is confirmed (as via FNAC here), surgical resection is the definitive treatment. 4. **Investigation of Choice:** While FNAC was done here, **CT-guided biopsy** or **PET-CT** are preferred for staging and characterization in clinical practice.

Q: Sister Joseph's nodule is indicative of cancer of all the following except:

Rectum. **Explanation:** **Sister Mary Joseph’s Nodule (SMJN)** refers to a palpable nodule in the umbilicus resulting from the metastasis of a malignant intra-abdominal or pelvic tumor. **Why Rectum is the Correct Answer:** The umbilicus receives lymphatic drainage from the organ systems via the subperitoneal plexus. While SMJN is associated with various intra-abdominal malignancies, it is **least likely** to occur with **rectal cancer**. Rectal lymphatics primarily drain to the pararectal, internal iliac, and inferior mesenteric nodes. In contrast, cancers of the upper gastrointestinal tract and pelvic organs have more direct embryonic or ligamentous pathways to the umbilicus. **Analysis of Other Options:** * **Stomach (Option A):** Gastric adenocarcinoma is the **most common** cause of SMJN (approx. 25-30% of cases). Metastasis occurs via the lymphatics or the gastrocolic ligament. * **Large Bowel (Option B):** Colon cancer is a frequent primary site. Spread occurs through the lymphatics or via the persistent vestigial remnants of the urachus or vitelline duct. * **Ovary (Option C):** Ovarian cancer is the most common cause of SMJN in females. Spread occurs via the suspensory ligaments or transperitoneal seeding. **High-Yield Clinical Pearls for NEET-PG:** * **Eponym:** Named after Sister Mary Joseph, the surgical assistant to Dr. William Mayo, who noticed the association between umbilical nodules and intra-abdominal malignancy. * **Prognosis:** The presence of SMJN signifies **advanced stage (Stage IV)** disease and carries a poor prognosis. * **Most Common Primary:** Stomach (Overall); Ovary (in females). * **Routes of Spread:** Lymphatics (most common), venous (portal circulation), or via vestigial structures (ligamentum teres, urachus).

Question 1

Papillary carcinoma of the thyroid primarily spreads via which route?

Accepted Answer

Lymphatic

Answer

Hematogenous

Answer

Local spread

Answer

All of the above

Question 2

Which of the following is a risk factor for breast carcinoma in women?

Accepted Answer

Consumption of fatty food

Answer

Early menopause

Answer

Smoking

Answer

Multiple sexual partners

Question 3

What is described as the en bloc resection of a segment of bone?

Accepted Answer

The entire tumor is removed intact with a rim of uninvolved bone while maintaining continuity of the jaw

Answer

Complete resection of the jaw bone

Answer

Resection of half of the affected jaw

Answer

Resection of the tumor only

Question 4

What is the most common tumor found in the posterior mediastinum?

Accepted Answer

Neurofibroma

Answer

Lung cyst

Answer

Dermoid cyst

Answer

Thyroid mass

Question 5

A 67-year-old retired judge is admitted to the emergency department with severe dyspnea after returning from vacation. On examination, inspiratory stridor, ecchymosis in his neck, and swelling of soft tissue and veins in his face and upper extremities are evident. The CT scan shows an expanding superior mediastinal hematoma. What is the most common source of mediastinal hemorrhage?

Accepted Answer

Trauma

Answer

Parotid gland surgery

Answer

Dissecting thoracic aneurysm

Answer

Mediastinal tumor

Question 6

Which of the following is NOT a risk factor for increased incidence of relapse in stage I carcinoma of the breast?

Accepted Answer

Decreased Her-2/neu oncogene expression

Answer

Negative estrogen/progesterone receptor status

Answer

High S phase fraction

Answer

Aneuploidy

Question 7

A 1 cm coin lesion is seen on chest X-ray in the right upper lobe. FNAC shows adenocarcinoma. What is the appropriate management?

Accepted Answer

Excision and observation

Answer

Excision and chemotherapy

Answer

Neoadjuvant chemotherapy followed by excision

Answer

Excision and chemoradiation

Question 8

In which type of cancer is immunoguided surgery typically performed?

Accepted Answer

Colon cancer

Answer

Pancreatic cancer

Answer

Jejunal cancer

Answer

Anal canal cancer

Question 9

A 45-year-old woman presents with a pigmented lesion on her right thigh. An incisional biopsy reveals malignant melanoma with a thickness of 3 mm. Findings on examination of the groin are normal. What is the most appropriate next step in management?

Accepted Answer

Wide local excision with a 2-cm margin and sentinel lymph node biopsy

Answer

Wide local excision with a 1-cm margin, followed by radiotherapy

Answer

Wide local excision with a 1-cm margin and groin lymph node dissection

Answer

Wide local excision with a 2-cm margin and groin lymph node dissection

Question 10

Sister Joseph's nodule is indicative of cancer of all the following except:

Accepted Answer

Rectum

Answer

Stomach

Answer

Large bowel

Answer

Ovary

Oncological Surgery — MCQs

Oncological Surgery — MCQs

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