General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 591: Absorbable suture material, Catgut, is primarily derived from the submucosal tissue of which animal's intestine?

A. Cat
B. Human
C. Sheep (Correct Answer)
D. All of the above

Explanation: **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).

Question 592: Which of the following is NOT used in the treatment of Marjolin's ulcer?

A. Wide excision
B. Radiotherapy (Correct Answer)
C. Amputation
D. Resection

Explanation: **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.

Question 593: Which classification is commonly used for diabetic foot gangrene?

A. Texas classification (Correct Answer)
B. Wagner classification
C. Insulinoma
D. None of the above

Explanation: 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.

Question 594: In the acronym "SWELLING" used for the history and examination of a lump or swelling, what does the letter 'N' stand for?

A. Nodes
B. Noise (Thrill/bruit) (Correct Answer)
C. Numbness
D. Neurological effects

Explanation: In clinical surgery, the acronym **SWELLING** is a systematic mnemonic used to ensure a comprehensive physical examination of any lump. **Explanation of the Correct Answer:** The letter **'N'** stands for **Noise**, which refers to the presence of a **bruit** (audible sound) or a **thrill** (palpable vibration). This is a critical clinical finding as it indicates high-velocity blood flow or turbulence. In the context of a swelling, a bruit or thrill typically suggests a vascular origin, such as an **Arteriovenous (AV) fistula** or an **aneurysm**. Auscultation for noise is the final step in the physical examination of a swelling. **Analysis of Incorrect Options:** * **Nodes:** While regional lymphadenopathy is vital in assessing a swelling (especially if malignant), it is usually assessed separately under "Regional Lymph Nodes" rather than within the SWELLING acronym itself. * **Numbness/Neurological effects:** These are symptoms or complications resulting from the swelling pressing on adjacent nerves, but they do not form part of the standard descriptive mnemonic for the physical characteristics of the lump. **The SWELLING Mnemonic Breakdown:** * **S:** Size, Shape, Site, Surface * **W:** Well-defined or ill-defined (Margins) * **E:** Edge, Effects on adjacent structures * **L:** Loss of function * **L:** Lumpiness (Consistency) * **I:** Irreducibility/Reducibility, Inflammation (Signs) * **N:** **Noise (Bruit/Thrill)** * **G:** Gentle pressure (Tenderness), Gravitational changes (Fluctuance/Emptying) **High-Yield Clinical Pearls for NEET-PG:** * **Pulsatility:** Always distinguish between **expansile pulsation** (aneurysm) and **transmitted pulsation** (solid mass over an artery). * **Fluctuation:** A positive fluctuation test indicates fluid. However, it may be false-positive in soft lipomas (Paget’s sign). * **Transillumination:** Highly suggestive of clear fluid-filled cysts, such as a **hydrocele** or **cystic hygroma**.

Question 595: Which of the following is NOT a limitation of minimal access surgery?

A. Loss of tactile feedback
B. Difficulty with haemostasis
C. Extraction of large specimens
D. Increased heat loss (Correct Answer)

Explanation: **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.

Question 596: Which of the following is NOT a type of mesenteric cyst?

A. Enterogenous cyst
B. Chylolymphatic cyst
C. Desmoid cyst (Correct Answer)
D. Desmoid cyst

Explanation: **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.

Question 597: What is a cystic compressible, translucent swelling in the posterior triangle of the neck?

A. Cystic hygroma (Correct Answer)
B. Branchial cyst
C. Thyroglossal cyst
D. Dermoid cyst

Explanation: ### 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.

Question 598: Which level do posterior triangle lymph nodes belong to?

A. Level 4
B. Level 5 (Correct Answer)
C. Level 6
D. Level 7

Explanation: 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 599: Thoracic duct injury causes all of the following EXCEPT:

A. Chylothorax
B. Lymphedema
C. Lymphopenia
D. Dehydration and electrolyte disturbance (Correct Answer)

Explanation: **Explanation:** Thoracic duct injury leads to the leakage of chyle, a fluid rich in triglycerides (chylomicrons), proteins, and T-lymphocytes. While chronic chyle loss can be debilitating, the question asks for the exception among common clinical consequences. **Why "Dehydration and electrolyte disturbance" is the correct answer:** Unlike high-output intestinal fistulas, chyle is essentially **iso-osmolar** with plasma and contains electrolyte concentrations similar to serum. While massive, prolonged loss can theoretically contribute to fluid shifts, it does not typically present as acute dehydration or significant electrolyte imbalance. The primary metabolic concerns in thoracic duct injury are **malnutrition** (loss of fats and fat-soluble vitamins) and **hypoproteinemia**, rather than acute water and salt depletion. **Analysis of other options:** * **Chylothorax:** This is the most common manifestation of a thoracic duct injury within the mediastinum, where chyle accumulates in the pleural space. * **Lymphedema:** Obstruction or injury to the main lymphatic trunk leads to impaired lymphatic drainage from the lower limbs and trunk, resulting in localized or systemic lymphedema. * **Lymphopenia:** Chyle contains a high concentration of T-lymphocytes (up to 90% of its cellular content). Persistent leakage leads to significant depletion of these cells, causing lymphopenia and subsequent immunosuppression. **High-Yield Clinical Pearls for NEET-PG:** * **Anatomy:** The thoracic duct starts at the **Cisterna Chyli (L2)**, enters the thorax through the **aortic opening (T12)**, and drains into the junction of the **left internal jugular and subclavian veins**. * **Diagnosis:** Chylothorax is confirmed by pleural fluid analysis showing **Triglycerides >110 mg/dL** and the presence of chylomicrons. * **Management:** Initial treatment is conservative (**NPO, MCT-rich diet**, or TPN). If drainage exceeds **1.5 L/day** in adults or persists for >2 weeks, surgical ligation is indicated.

Question 600: Which of the following structures may be injured during surgery to repair an inguinal hernia?

A. The ilioinguinal, genitofemoral, iliohypogastric, and lateral femoral cutaneous nerves (Correct Answer)
B. The femoral nerve
C. The popliteal nerve
D. The nerve to the psoas major muscle

Explanation: In inguinal hernia repair (both open and laparoscopic), knowledge of the regional neuroanatomy is critical to prevent chronic postoperative inguinal pain (CPIP). **Explanation of the Correct Answer:** The nerves most at risk are those traversing the inguinal canal or the preperitoneal space (the "Triangle of Pain"): * **Ilioinguinal Nerve (L1):** Runs on the surface of the spermatic cord; most commonly injured during open repairs (Lichtenstein). * **Iliohypogastric Nerve (L1):** Located superior to the internal ring; often injured during the incision or suturing of the external oblique aponeurosis. * **Genitofemoral Nerve (L1, L2):** The **genital branch** travels through the canal (sensory to scrotum/labia), while the **femoral branch** provides sensation to the upper anterior thigh. * **Lateral Femoral Cutaneous Nerve (L2, L3):** Primarily at risk during **laparoscopic repairs** (TEP/TAPP) if tacks are placed lateral to the deep inguinal ring and inferior to the iliopubic tract. **Why Other Options are Incorrect:** * **B. Femoral Nerve:** While it lies in the femoral triangle, it is deep to the iliopubic tract and usually protected by the psoas fascia. It is rarely injured unless deep, misplaced sutures are used. * **C. Popliteal Nerve:** This is a distal branch of the sciatic nerve located in the posterior knee; it has no anatomical relation to the inguinal region. * **D. Nerve to Psoas Major:** These are small branches from the lumbar plexus (L2-L4) located deep within the retroperitoneum and are not encountered during standard hernia surgery. **High-Yield Clinical Pearls for NEET-PG:** * **Triangle of Pain:** Bound by the spermatic vessels (medially) and iliopubic tract (superiorly). It contains the femoral branch of the genitofemoral, lateral femoral cutaneous, and femoral nerves. **Rule:** Avoid tacks here. * **Triangle of Doom:** Bound by the vas deferens (medially) and spermatic vessels (laterally). It contains the **External Iliac Artery and Vein**. * **Most common nerve injured in Open Repair:** Ilioinguinal nerve. * **Most common nerve injured in Laparoscopic Repair:** Lateral femoral cutaneous nerve.

Practice by Chapter

Wound Healing and Care

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Surgical Infections

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Fluid and Electrolyte Management

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Nutrition in Surgical Patients

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Hemostasis and Blood Transfusion

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Surgical Instruments and Equipment

Practice Questions

Sutures and Stapling Devices

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Minimal Access Surgery Principles

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Surgical Complications

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Anesthesia Principles for Surgeons

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Surgical Oncology Principles

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Evidence-Based Surgery

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