General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 41: What is the best surgical approach for accessing a retrosternal goiter?

A. Cervical (Correct Answer)
B. Sternal
C. Intercostal
D. VATS

Explanation: **Explanation:** The majority of retrosternal goiters (90-95%) can be successfully removed via a **Cervical (collar) incision**. This is because most retrosternal goiters are "secondary"—meaning they originate in the neck and descend into the mediastinum due to gravity and negative intrathoracic pressure. Crucially, these goiters maintain their blood supply from the **superior and inferior thyroid arteries**, which are easily accessible through a neck incision. Once the vascular pedicles are ligated, the gland can usually be delivered upward into the neck using digital maneuvers. **Analysis of Incorrect Options:** * **Sternal (Sternotomy):** This is reserved for "primary" intrathoracic goiters (rare, ectopic tissue with blood supply from the aorta or internal mammary) or cases where the goiter is massive, malignant, or impacted in the posterior mediastinum. It is not the first-line approach. * **Intercostal (Thoracotomy):** This approach is rarely used for thyroid surgery unless the goiter is located deep in the posterior mediastinum or if there is a specific complication requiring lateral access. * **VATS (Video-Assisted Thoracoscopic Surgery):** While minimally invasive, it is not the standard of care for retrosternal goiters as the primary goal is safe vascular control in the neck. **Clinical Pearls for NEET-PG:** * **Definition:** A goiter is considered retrosternal if >50% of its mass lies below the thoracic inlet. * **Pemberton’s Sign:** Facial congestion and inspiratory stridor upon raising both arms; indicates thoracic inlet obstruction by a goiter. * **Indications for Sternotomy:** Recurrent goiters, malignancy with mediastinal nodes, or goiters larger than the thoracic inlet diameter.

Question 42: All of the following are true about Auger's hernia, except:

A. It is a type of femoral hernia.
B. It is seen in front of the femoral vessels. (Correct Answer)
C. It has a high strangulation rate.
D. It is a hernia through the lacunar ligament.

Explanation: **Explanation:** **Auger’s Hernia** (also known as a Laugier’s hernia) is a rare clinical variant of a femoral hernia. The correct answer is **Option B** because Auger’s hernia is **not** seen in front of the femoral vessels; rather, it occurs through a defect in the **lacunar ligament** (Gimbernat’s ligament). 1. **Why Option B is the correct answer (The Exception):** A hernia that occurs specifically in front of the femoral vessels is known as a **Prevascular hernia (Teale’s hernia)**. In contrast, Auger’s hernia passes through the fibers of the lacunar ligament, medial to the femoral vein. Therefore, the statement that it is in front of the vessels is anatomically incorrect. 2. **Analysis of other options:** * **Option A:** It is indeed a subtype of femoral hernia, distinguished by its unusual exit point through the lacunar ligament rather than the femoral canal. * **Option C:** Like all femoral hernias, Auger’s hernia has a very high rate of strangulation. This is because the lacunar ligament forms a rigid, non-distensible boundary that easily constricts the herniated contents. * **Option D:** This is the defining anatomical feature of Auger’s hernia. It pierces the lacunar ligament to enter the thigh. **High-Yield Clinical Pearls for NEET-PG:** * **Velpeau Hernia:** A femoral hernia located **lateral** to the femoral vessels (Pre-styloid). * **Cloquet’s Hernia:** A hernia that lies deep to the pectineal fascia. * **De Garengeot Hernia:** Presence of the appendix within a femoral hernia sac. * **Key Anatomy:** The femoral canal is bounded medially by the lacunar ligament, laterally by the femoral vein, and anteriorly by the inguinal ligament. Any hernia through these boundaries is a surgical emergency due to the narrow neck.

Question 43: A patient presents with a 1.5 cm fibroma on the floor of the mouth. What type of biopsy is recommended?

A. Excisional biopsy
B. Incisional biopsy (Correct Answer)
C. Punch biopsy
D. Brush biopsy

Explanation: **Explanation:** The management of oral lesions depends primarily on the size and clinical suspicion of the lesion. For a **1.5 cm fibroma on the floor of the mouth**, an **incisional biopsy** is the recommended approach. The floor of the mouth is a high-risk area for malignancy and contains vital structures (submandibular ducts, lingual nerves). According to surgical principles, any oral lesion larger than **1 cm** or those with suspicious features should undergo an incisional biopsy first. This allows for a definitive histological diagnosis without performing an extensive primary surgery that might compromise margins if the lesion proves to be malignant. **Analysis of Options:** * **Excisional Biopsy (Incorrect):** This is reserved for small, clinically benign lesions (usually **<1 cm**). Attempting excision on a 1.5 cm lesion in the floor of the mouth without a diagnosis may lead to inadequate margins or unnecessary morbidity. * **Punch Biopsy (Incorrect):** While useful for skin or certain fixed oral sites (like the hard palate), it is less ideal for the mobile, soft tissue of the floor of the mouth where depth control and representative sampling are better achieved via a scalpel incisional biopsy. * **Brush Biopsy (Incorrect):** This is a cytological screening tool, not a diagnostic biopsy. It cannot differentiate between invasive carcinoma and carcinoma in situ. **High-Yield Clinical Pearls for NEET-PG:** * **Size Rule:** Lesion <1 cm → Excisional; Lesion >1 cm → Incisional. * **Location:** The floor of the mouth and the ventrolateral tongue are the most common sites for oral squamous cell carcinoma (SCC). * **Technique:** When performing an incisional biopsy, always include a sample of the **junction between the lesion and normal-appearing tissue** to help the pathologist assess invasion.

Question 44: Which of the following is NOT a cause for a solitary pulmonary nodule diagnosis?

A. Tuberculoma
B. Bronchial adenoma
C. Hamartoma
D. Neurofibroma (Correct Answer)

Explanation: A **Solitary Pulmonary Nodule (SPN)** is defined as a single, well-circumscribed radiographic opacity measuring $\leq$ 3 cm in diameter that is completely surrounded by aerated lung parenchyma, without associated atelectasis or lymphadenopathy. ### Explanation of the Correct Answer **D. Neurofibroma:** This is the correct answer because neurofibromas are **extrapulmonary** tumors. They typically arise from the intercostal nerves and are located in the **posterior mediastinum** or the chest wall. On imaging, they may appear to overlap with the lung field, but they do not originate within the lung parenchyma itself. Therefore, they do not meet the definition of an intrapulmonary nodule. ### Why the Other Options are Incorrect * **A. Tuberculoma:** This is a common infectious cause of SPN, especially in endemic regions like India. It represents a healed or persistent focus of tuberculosis and often shows "popcorn" or "speckled" calcification. * **B. Bronchial Adenoma:** These are low-grade malignant epithelial tumors (like carcinoids) that arise from the bronchial tree. They frequently present as a solitary peripheral or central nodule. * **C. Hamartoma:** This is the most common **benign** tumor of the lung. It is a classic cause of SPN and is characteristically identified by "popcorn calcification" on CT scans. ### NEET-PG High-Yield Pearls * **Size Threshold:** If a lesion is $>3$ cm, it is termed a **Lung Mass**, which has a much higher risk of malignancy. * **Most Common Benign Cause:** Granulomas (e.g., Tuberculosis, Histoplasmosis). * **Most Common Benign Tumor:** Hamartoma. * **Malignancy Signs:** Spiculated margins, size $>2$ cm, smoker status, and eccentric or absent calcification. * **Doubling Time:** Malignant nodules typically double in volume between 20 to 400 days. Stability for $>2$ years suggests benignity.

Question 45: A 65-year-old male smoker presents with a right inguinal mass. He complains of recent difficulty with micturition and nocturia. The swelling does not extend to the scrotum and reduces when resting. What is the likely diagnosis?

A. Direct Inguinal hernia (Correct Answer)
B. Strangulated indirect inguinal hernia
C. Hydrocele
D. Cyst of the cord

Explanation: ### Explanation **Correct Answer: A. Direct Inguinal Hernia** The diagnosis is based on the patient’s age, clinical presentation, and associated symptoms. 1. **Age and Risk Factors:** Direct hernias are "acquired" hernias, common in elderly males due to weakness in the **Hesselbach’s triangle** (specifically the fascia transversalis). Smoking and chronic straining (due to urinary obstruction) are major predisposing factors. 2. **Clinical Features:** The swelling is described as not extending to the scrotum and reducing when resting, which are classic features of a direct hernia. Unlike indirect hernias, direct hernias rarely descend into the scrotum. 3. **Associated Symptoms:** The patient’s difficulty with micturition and nocturia suggest **Benign Prostatic Hyperplasia (BPH)**. In NEET-PG scenarios, any elderly male with a new-onset inguinal hernia must be evaluated for "precipitating factors" that increase intra-abdominal pressure, such as BPH, chronic cough (COPD), or constipation. --- ### Why the other options are incorrect: * **B. Strangulated indirect inguinal hernia:** Strangulation is a surgical emergency presenting with irreducible swelling, severe pain, and signs of intestinal obstruction (vomiting, constipation). This patient’s hernia reduces when resting. * **C. Hydrocele:** A hydrocele is a fluid collection within the tunica vaginalis. It is typically non-reducible, gives a positive transillumination test, and one can "get above the swelling" (unlike a hernia). * **D. Cyst of the cord:** This is a localized fluid collection along the spermatic cord. It is typically a small, tense, mobile, and non-reducible swelling that moves downward when the testis is pulled. --- ### NEET-PG High-Yield Pearls: * **Hesselbach’s Triangle Boundaries:** Lateral—Inferior epigastric artery; Medial—Lateral border of Rectus abdominis; Inferior—Inguinal ligament. * **Direct vs. Indirect:** Direct hernias are **medial** to the inferior epigastric artery; Indirect hernias are **lateral**. * **Internal Ring Occlusion Test:** If the hernia is controlled by occluding the internal ring, it is Indirect. If it still protrudes, it is Direct. * **Malgaigne’s Bulge:** A characteristic bilateral fullness in the inguinal region often seen in direct hernias.

Question 46: What is the most useful investigation for a sliding hernia in a female?

A. Fluoroscopy
B. Barium meal (Correct Answer)
C. Palpation
D. Ultrasound

Explanation: **Explanation:** A **sliding hernia** occurs when a portion of a retroperitoneal organ (most commonly the bladder or sigmoid colon in males, and the **ovaries or fallopian tubes** in females) forms part of the hernia sac wall. **Why Barium Meal is the Correct Answer:** In the context of a sliding hiatus hernia (the most common type of sliding hernia), a **Barium meal (Upper GI series)** is the investigation of choice. It allows for the visualization of the gastroesophageal junction and the stomach's position relative to the diaphragm. It provides excellent anatomical detail regarding the "sliding" nature of the viscera, especially when performed in the Trendelenburg position to provoke the herniation. **Analysis of Incorrect Options:** * **A. Fluoroscopy:** While fluoroscopy is used *during* a barium study to observe real-time movement, "Barium meal" is the specific diagnostic procedure required to outline the mucosal anatomy. * **C. Palpation:** Physical examination can identify the presence of an inguinal or femoral hernia but cannot definitively diagnose the "sliding" component (the involvement of an internal organ as the sac wall). * **D. Ultrasound:** While useful for identifying contents in an inguinal hernia (like an ovary), it is operator-dependent and less sensitive than contrast studies for defining the anatomical relationships in sliding hiatus hernias. **High-Yield Clinical Pearls for NEET-PG:** * **Most common organ** in a sliding hernia: **Sigmoid colon** (left side) and **Cecum** (right side). * In **females**, the most common sliding components are the **Ovary and Fallopian tubes**. * **Clinical Significance:** The primary danger in sliding hernias is accidental injury to the "sliding" organ during the division of the hernia sac, as the organ itself forms the posterior wall. * **Management:** The "La Roque" approach (internal abdominal approach) is often used for difficult sliding hernias.

Question 47: What is the preservative used for this suture material?

A. saline
B. ethanol
C. formalin
D. isopropyl alcohol (Correct Answer)

Explanation: ***Isopropyl alcohol*** - **Catgut sutures** are preserved in **isopropyl alcohol** to maintain their sterility and prevent bacterial contamination during storage. - **Isopropyl alcohol (70%)** provides effective antimicrobial action while maintaining the **tensile strength** and flexibility of the catgut material. *Saline* - **Saline** lacks antimicrobial properties and would not provide adequate preservation for long-term storage of suture materials. - Storage in saline could lead to **bacterial growth** and **degradation** of the catgut suture material over time. *Ethanol* - **Ethanol** can cause excessive dehydration and **hardening** of catgut sutures, making them brittle and difficult to handle. - Unlike **isopropyl alcohol**, ethanol may compromise the **flexibility** and handling characteristics of the suture material. *Formalin* - **Formalin** is a tissue fixative used for histopathological specimens, not for preserving surgical suture materials. - Formalin would cause **cross-linking** and **hardening** of the catgut protein, making it unsuitable for surgical use.

Question 48: A 20-year-old 70kg man is put on fast perioperatively. 100gm of glucose is given per day as 5% dextrose solution. This is to:

A. Meet daily calorie requirement
B. Meet daily fluid requirement
C. Sustain cerebral energy metabolism (Correct Answer)
D. Sustain anabolic status

Explanation: ### Explanation **1. Why Option C is Correct:** The human brain is an obligate consumer of glucose, requiring approximately **100–120 grams of glucose per day** to maintain its metabolic functions. During periods of fasting, the body initially utilizes hepatic glycogen stores. Once these are depleted (within 12–24 hours), the body begins **gluconeogenesis**, primarily by breaking down skeletal muscle proteins (amino acids). Providing 100g of exogenous glucose (as 5% Dextrose) serves a **"protein-sparing effect."** It provides the minimum glucose required for cerebral metabolism, thereby reducing the need for the body to undergo massive proteolysis to produce glucose. **2. Why Other Options are Incorrect:** * **Option A:** A 70kg man requires approximately **25–30 kcal/kg/day** (approx. 1750–2100 kcal). 100g of glucose provides only **400 kcal** (4 kcal/g), which is insufficient to meet total daily caloric requirements. * **Option B:** 100g of glucose in 5% Dextrose equals **2 liters** of fluid (5g/100ml). While this contributes to fluid intake, the *primary metabolic reason* for the specific 100g dose is glucose homeostasis, not volume replacement. * **Option D:** Anabolism requires a positive nitrogen balance and surplus calories. 400 kcal/day is a starvation-level intake; it merely slows down catabolism (protein breakdown) but cannot sustain an anabolic state. **3. High-Yield Clinical Pearls for NEET-PG:** * **Protein Sparing:** The administration of 100g of glucose reduces urinary nitrogen excretion by 50%, reflecting decreased muscle protein breakdown. * **Caloric Value:** Remember that 1 gram of anhydrous dextrose provides **3.4 to 4 kcal**. * **RQ (Respiratory Quotient):** In a fasting state, the RQ drops toward 0.7 (fat oxidation). Giving glucose shifts the RQ back toward 1.0. * **Obligate Glucose Users:** Besides the brain, RBCs, WBCs, and the renal medulla are obligate glucose users as they lack mitochondria for fatty acid oxidation.

Question 49: At what level is a below-knee amputation typically performed?

A. 5 cm below the tibial tuberosity
B. 10 cm below the tibial tuberosity (Correct Answer)
C. 15 cm below the tibial tuberosity
D. 20 cm below the tibial tuberosity

Explanation: **Explanation:** The ideal level for a below-knee (transtibial) amputation is **10 cm below the tibial tuberosity** (or approximately 12.5–15 cm below the knee joint line). This level is considered the "gold standard" because it preserves a sufficient bony lever arm for efficient mobilization while ensuring adequate soft tissue coverage for prosthetic fitting. * **Why 10 cm is correct:** At this length, the stump is long enough to provide mechanical advantage for the quadriceps and hamstrings, yet short enough to allow for the bulky components of modern prosthetic sockets. It also ensures that the skin is well-vascularized, reducing the risk of flap necrosis. * **Why A (5 cm) is incorrect:** A stump shorter than 8–10 cm provides a very poor lever arm. The short segment often slips out of the prosthetic socket during flexion, making walking difficult and unstable. * **Why C & D (15–20 cm) are incorrect:** Amputations in the lower third of the leg are discouraged because the distal leg has poor vascularity and minimal muscle bulk. This leads to thin, fragile skin over the bone, frequent wound breakdown, and chronic pain due to inadequate padding. **High-Yield Clinical Pearls for NEET-PG:** * **Burgess Flap:** The standard technique uses a **long posterior myofascial flap** because the posterior calf skin has a better blood supply than the anterior skin. * **Nerve Management:** Nerves (like the tibial nerve) should be pulled distally, cut, and allowed to retract proximally to prevent the formation of painful **junctional neuromas**. * **Fibula Management:** The fibula is typically cut **1–2 cm shorter** than the tibia to prevent lateral pressure sores within the prosthesis. * **Ideal Stump Shape:** The final stump should be **conical** or cylindrical, never bulbous, to facilitate prosthetic use.

Question 50: When mesh is sutured to the edge of a defect, what is this technique called?

A. Onlay mesh
B. Inlay mesh (Correct Answer)
C. Underlay mesh
D. Sublay mesh

Explanation: ### Explanation The correct answer is **Inlay mesh**. This question tests the anatomical positioning of prosthetic mesh in ventral and incisional hernia repairs. **1. Why Inlay mesh is correct:** In the **Inlay technique**, the mesh is placed within the defect itself and sutured directly to the **edges of the fascia** (the margins of the defect). This technique is essentially a "bridge" across the gap. It is generally considered the least preferred method because it does not provide an overlap, leading to a higher risk of recurrence and mesh-fascia separation due to intra-abdominal pressure. **2. Why the other options are incorrect:** * **Onlay mesh:** The mesh is placed on top of the anterior rectus sheath (on the fascia). It requires extensive subcutaneous dissection and is associated with higher rates of seroma and wound infection. * **Sublay mesh (Retromuscular):** The mesh is placed behind the rectus muscle but in front of the posterior rectus sheath. This is often considered the "gold standard" (Rives-Stoppa repair) as it utilizes intra-abdominal pressure to keep the mesh in place. * **Underlay mesh (Preperitoneal/Intraperitoneal):** The mesh is placed deep to the abdominal wall layers, either in the preperitoneal space or intraperitoneally (IPOM). **High-Yield Clinical Pearls for NEET-PG:** * **Pascal’s Principle:** This explains why **Sublay and Underlay** techniques are superior; intra-abdominal pressure pushes the mesh against the abdominal wall, strengthening the repair. * **Ideal Overlap:** For a secure repair, a mesh overlap of at least **3–5 cm** beyond the defect edges is recommended. * **IPOM (Intraperitoneal Onlay Mesh):** Despite the name "onlay," in laparoscopic surgery, this refers to placing the mesh against the peritoneum from the inside (an underlay position). Specialized "dual-mesh" (with an anti-adhesive layer) must be used to prevent bowel adhesions.

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

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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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