General Surgery Principles Practice Questions

Q: Absorbable suture material, Catgut, is primarily derived from the submucosal tissue of which animal's intestine?

Sheep. **Explanation:** **Surgical Catgut** is a natural, absorbable, multifilament suture material. Despite its name, it is not derived from cats. It is primarily manufactured from the **submucosal layer of sheep intestine** or the serosal layer of bovine (cattle) intestine. * **Why Sheep is Correct:** The submucosa of the sheep's small intestine is rich in collagen. This collagen is purified and twisted into strands to create the suture. It is absorbed by the body through **enzymatic digestion** (proteolysis) rather than hydrolysis, which often leads to a significant inflammatory tissue reaction. * **Why other options are incorrect:** * **Cat:** The term "catgut" likely originates from "kitgut" (referring to a fiddle or kit) or "cattle-gut." There is no historical or medical record of using feline intestines for mass-produced surgical sutures. * **Human:** Human tissue is not used for suture manufacturing due to ethical constraints, risk of disease transmission, and lack of structural suitability compared to processed animal collagen. **High-Yield Clinical Pearls for NEET-PG:** * **Absorption Profile:** Plain catgut loses its tensile strength in 7–10 days and is completely absorbed in 60–70 days. * **Chromic Catgut:** Treated with chromium salts to delay absorption by tanning the collagen fibers. It maintains strength for 14–21 days and reduces tissue reaction. * **Contraindication:** Catgut should **never** be used in vascular or cardiac surgeries, or for infected tissues, as it loses strength rapidly in the presence of proteolytic enzymes. * **Sterilization:** It is sterilized by **Gamma radiation** (it cannot be autoclaved as heat denatures the protein).

Q: Which of the following is NOT used in the treatment of Marjolin's ulcer?

Radiotherapy. **Explanation:** **Marjolin’s ulcer** is a highly aggressive **Squamous Cell Carcinoma (SCC)** that arises in areas of chronic inflammation, most commonly in old burn scars (cicatrix), chronic osteomyelitis sinuses, or long-standing venous ulcers. **Why Radiotherapy is the Correct Answer:** Radiotherapy is generally **avoided** and considered ineffective for Marjolin’s ulcer for two primary reasons: 1. **Radio-resistance:** The dense, avascular fibrous tissue (scar tissue) surrounding the ulcer is poorly oxygenated. Since radiation requires oxygen to generate free radicals for DNA damage, these ulcers are notoriously resistant to radiotherapy. 2. **Risk of recurrence/Malignancy:** Radiation can further compromise the blood supply to the already scarred area, leading to poor healing and potentially inducing further malignant transformation in the surrounding unstable skin. **Analysis of Incorrect Options:** * **A & D. Wide Excision/Resection:** This is the **treatment of choice**. A margin of at least 2 cm is required due to the high risk of local recurrence and the aggressive nature of the lesion. * **C. Amputation:** This is indicated if the ulcer is deep, involves the underlying bone (osteomyelitis), involves major neurovascular bundles, or if wide local excision would result in a non-functional limb. **Clinical Pearls for NEET-PG:** * **Latency Period:** The average time for malignant transformation is 30–35 years. * **Lymphatic Spread:** Unlike typical SCC, Marjolin’s ulcer has a higher rate of regional lymph node metastasis because the scar tissue lack normal lymphatics; once the tumor breaches the scar, it spreads rapidly. * **Biopsy:** Always perform an edge biopsy to confirm the diagnosis. * **Prognosis:** It is much more aggressive than primary SCC of the skin.

Q: Which classification is commonly used for diabetic foot gangrene?

Texas classification. The classification of diabetic foot ulcers and gangrene is a high-yield topic in surgery, focusing on assessing the severity and predicting the risk of amputation. **Explanation of the Correct Answer:** **A. Texas Classification:** This is currently the preferred system because it is more comprehensive than older models. It uses a dual-axis approach: **Grades (0-3)** based on the depth of the wound and **Stages (A-D)** based on the presence of infection, ischemia, or both. By incorporating vascular status (ischemia) and infection—the two primary drivers of limb loss—it provides a better prognostic value for healing compared to systems that only look at depth. **Explanation of Incorrect Options:** * **B. Wagner Classification:** While historically the most common, it is now considered less ideal because it primarily focuses on wound depth and does not adequately account for ischemia or infection in its early stages. However, it is still frequently tested (Grade 0: Pre-ulcerative; Grade 5: Extensive gangrene). * **C. Insulinoma:** This is a neuroendocrine tumor of the pancreas that secretes insulin, leading to hypoglycemia. It is unrelated to the classification of foot ulcers. **Clinical Pearls for NEET-PG:** * **Wagner Grade 3:** Characterized by deep ulcer with osteomyelitis or abscess. * **Wagner Grade 4:** Localized gangrene (forefoot/heel). * **Wagner Grade 5:** Entire foot gangrene. * **Monckeberg’s Sclerosis:** Often seen in diabetic patients, involving medial calcific sclerosis of arteries, leading to falsely elevated Ankle-Brachial Index (ABI) readings. * **Gold Standard for Ischemia:** While ABI is a screening tool, **Toe Pressure** or **Transcutaneous Oxygen Tension (TcPO2)** are more reliable in diabetics due to non-compressible vessels.

Q: Which of the following is NOT a limitation of minimal access surgery?

Increased heat loss. **Explanation:** The correct answer is **D. Increased heat loss**. In minimal access surgery (MAS), heat loss is actually **decreased** compared to open surgery. This is because the abdominal or thoracic cavity remains closed, preventing the evaporative heat loss and radiant cooling that occurs when large internal surface areas are exposed to the ambient operating room air. Furthermore, the insufflated CO2 is often warmed, helping to maintain core body temperature. **Analysis of Incorrect Options:** * **A. Loss of tactile feedback:** This is a major limitation. Surgeons lose the ability to palpate tissues directly (haptics), relying instead on visual cues and the "feel" transmitted through long instruments. * **B. Difficulty with haemostasis:** Controlling sudden, brisk hemorrhage is more challenging in MAS due to limited instrument angles, the need for specialized equipment (clips/staplers), and the potential for blood to obscure the camera lens. * **C. Extraction of large specimens:** Since the primary goal is small incisions, removing large organs (e.g., a bulky spleen or a large tumor) requires morcellation or a separate "mini-laparotomy" incision, which can be a technical bottleneck. **High-Yield Clinical Pearls for NEET-PG:** * **Hand-Assisted Laparoscopy:** Developed specifically to overcome the limitations of tactile feedback and specimen extraction. * **The "Fulcrum Effect":** A limitation where the instrument moves in the opposite direction to the surgeon's hand due to the pivot point at the abdominal wall. * **Pneumoperitoneum Effects:** Remember that CO2 insufflation can cause hypercapnia, decreased venous return, and increased systemic vascular resistance.

Q: Which of the following is NOT a type of mesenteric cyst?

Desmoid cyst. **Explanation:** Mesenteric cysts are rare intra-abdominal lesions located between the leaves of the mesentery. The classification of these cysts is based on their histopathological origin. **Why "Desmoid cyst" is the correct answer:** A **Desmoid tumor** (also known as aggressive fibromatosis) is a solid, non-metastasizing but locally invasive fibroblastic proliferation. It is **not a cyst**. Desmoid tumors commonly occur in the abdominal wall or the mesentery (especially in patients with Gardner Syndrome), but they are solid neoplastic masses, not cystic lesions. Therefore, "Desmoid cyst" is a misnomer and does not exist in the standard classification of mesenteric cysts. **Analysis of other options:** * **Enterogenous cyst:** These are thick-walled cysts derived from the embryonic gut (sequestration from the bowel). They are lined by intestinal epithelium and may contain a muscle layer. * **Chylolymphatic cyst:** This is the **most common type** of mesenteric cyst. It arises from sequestered lymphatic tissue and contains clear or milky (chyle) fluid. It has a very thin wall and a separate blood supply from the adjacent bowel, making enucleation easier. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** Often presents as an asymptomatic abdominal mass or with "Tillaux’s Sign" (a mass that is mobile only in a direction perpendicular to the line of the mesentery). * **Most Common Site:** Mesentery of the ileum. * **Treatment of Choice:** Enucleation is preferred. If the blood supply is shared with the bowel, formal bowel resection may be required. * **Differential Diagnosis:** Must be distinguished from an omental cyst, which is located anterior to the bowel loops.

Q: What is a cystic compressible, translucent swelling in the posterior triangle of the neck?

Cystic hygroma. ### Explanation **Correct Answer: A. Cystic hygroma** **Why it is correct:** A **Cystic hygroma** is a congenital malformation of the lymphatic system (lymphangioma) resulting from the failure of lymphatics to connect with the venous system. It characteristically presents as a **painless, soft, cystic, and compressible** mass. Because it contains clear lymph and has thin walls, it is **brilliantly translucent**. Its most common location is the **posterior triangle of the neck** (specifically the supraclavicular fossa), as this is the site of the primitive jugular lymph sacs. **Why the other options are incorrect:** * **B. Branchial cyst:** Typically located at the junction of the upper 1/3rd and lower 2/3rds of the **anterior border of the sternocleidomastoid muscle**. It is usually opaque (not translucent) because it contains cholesterol-rich fluid. * **C. Thyroglossal cyst:** Found in the **midline** of the neck, usually at the level of the hyoid bone. Its hallmark clinical feature is that it **moves upward on protrusion of the tongue**. * **D. Dermoid cyst:** Usually occurs in the midline (submental region). It is a "doughy" or firm swelling that is **not translucent** and does not fluctuate as easily as a cystic hygroma. **High-Yield Clinical Pearls for NEET-PG:** * **Transillumination:** Cystic hygroma is the "classic" brilliantly translucent neck swelling. * **Surgical Anatomy:** It is often "multilocular" and can infiltrate deep structures, making complete surgical excision challenging. * **Associations:** Frequently associated with chromosomal abnormalities like **Turner syndrome** (45, XO) and Down syndrome. * **Complications:** Sudden increase in size usually indicates hemorrhage into the cyst or secondary infection.

Q: Which level do posterior triangle lymph nodes belong to?

Level 5. The classification of cervical lymph nodes into levels is a fundamental concept in surgical oncology and head and neck surgery, primarily based on the **Memorial Sloan Kettering Cancer Center (MSKCC)** system. ### **Explanation of the Correct Answer** **Level 5 (Posterior Triangle Nodes)** is the correct answer. These nodes are located within the posterior triangle of the neck, which is anatomically bounded anteriorly by the posterior border of the sternocleidomastoid (SCM) muscle, posteriorly by the anterior border of the trapezius muscle, and inferiorly by the clavicle. * **Subdivisions:** Level 5 is further divided into **5A** (upper, above the cricoid cartilage) and **5B** (lower, below the cricoid). * **Clinical Significance:** These nodes primarily drain the nasopharynx, oropharynx, and the posterior scalp. ### **Analysis of Incorrect Options** * **Level 4 (Lower Jugular Nodes):** These are located deep to the lower third of the SCM, extending from the level of the cricoid cartilage down to the clavicle. * **Level 6 (Anterior Compartment Nodes):** These are the "central" nodes located between the carotid sheaths. They include the pre-laryngeal, pre-tracheal, and para-tracheal nodes. * **Level 7 (Superior Mediastinal Nodes):** These are located below the suprasternal notch, within the superior mediastinum. ### **High-Yield Clinical Pearls for NEET-PG** * **Level 1:** Submental (1A) and Submandibular (1B) nodes. * **Level 2, 3, 4:** Upper, Middle, and Lower Deep Cervical (Jugular) nodes respectively. * **The "Sentinel Node" of the neck:** Often refers to the **Jugulodigastric node**, which belongs to **Level 2**. * **Virchow’s Node:** A supraclavicular node (often associated with Level 4 or 5) on the left side, indicating gastric or abdominal malignancy (Troisier’s sign). * **Radical Neck Dissection (RND):** Involves removal of Levels 1 through 5 along with the SCM, Internal Jugular Vein, and Spinal Accessory Nerve.

Question 1

Absorbable suture material, Catgut, is primarily derived from the submucosal tissue of which animal's intestine?

Accepted Answer

Sheep

Answer

Cat

Answer

Human

Answer

All of the above

Question 2

Which of the following is NOT used in the treatment of Marjolin's ulcer?

Accepted Answer

Radiotherapy

Answer

Wide excision

Answer

Amputation

Answer

Resection

Question 3

Which classification is commonly used for diabetic foot gangrene?

Accepted Answer

Texas classification

Answer

Wagner classification

Answer

Insulinoma

Answer

None of the above

Question 4

In the acronym "SWELLING" used for the history and examination of a lump or swelling, what does the letter 'N' stand for?

Accepted Answer

Noise (Thrill/bruit)

Answer

Nodes

Answer

Numbness

Answer

Neurological effects

Question 5

Which of the following is NOT a limitation of minimal access surgery?

Accepted Answer

Increased heat loss

Answer

Loss of tactile feedback

Answer

Difficulty with haemostasis

Answer

Extraction of large specimens

Question 6

Which of the following is NOT a type of mesenteric cyst?

Accepted Answer

Desmoid cyst

Answer

Enterogenous cyst

Answer

Chylolymphatic cyst

Question 7

What is a cystic compressible, translucent swelling in the posterior triangle of the neck?

Accepted Answer

Cystic hygroma

Answer

Branchial cyst

Answer

Thyroglossal cyst

Answer

Dermoid cyst

Question 8

Which level do posterior triangle lymph nodes belong to?

Accepted Answer

Level 5

Answer

Level 4

Answer

Level 6

Answer

Level 7

Question 9

Thoracic duct injury causes all of the following EXCEPT:

Accepted Answer

Dehydration and electrolyte disturbance

Answer

Chylothorax

Answer

Lymphedema

Answer

Lymphopenia

Question 10

Which of the following structures may be injured during surgery to repair an inguinal hernia?

Accepted Answer

The ilioinguinal, genitofemoral, iliohypogastric, and lateral femoral cutaneous nerves

Answer

The femoral nerve

Answer

The popliteal nerve

Answer

The nerve to the psoas major muscle

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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