General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 181: Rectal examination should not be done in which of the following conditions?

A. Anal fissure (Correct Answer)
B. Fistula in ano
C. Prolapsed piles with bleeding
D. Anal stenosis

Explanation: **Explanation:** The Digital Rectal Examination (DRE) is a fundamental clinical skill, but it is contraindicated in conditions where the procedure would cause **excruciating pain** or risk further tissue trauma. **Why Anal Fissure is the Correct Answer:** An anal fissure is a longitudinal tear in the anoderm, most commonly located in the posterior midline. It is characterized by severe, sharp, "knife-like" pain during and after defecation, often leading to secondary internal anal sphincter spasm. Attempting a DRE in an acute fissure is extremely painful for the patient and can worsen the spasm. Diagnosis is typically made by gentle inspection (spreading the buttocks) rather than palpation. If a DRE is mandatory, it must be performed under general or regional anesthesia. **Analysis of Incorrect Options:** * **Fistula in ano:** DRE is essential here to palpate the internal opening, assess the tract (Goodsall’s rule), and check sphincter tone. It is generally not acutely painful unless an abscess is present. * **Prolapsed piles with bleeding:** While uncomfortable, internal hemorrhoids are soft and usually painless unless strangulated or thrombosed. DRE is necessary to rule out associated rectal malignancies. * **Anal stenosis:** While a DRE may be physically difficult or require a smaller finger (or be impossible if the narrowing is severe), it is not a primary contraindication based on pain/trauma in the same way an acute fissure is. **High-Yield Clinical Pearls for NEET-PG:** * **Acute Phase Rule:** In surgery, "Never put your finger in an acute fissure." * **Most common site:** Posterior midline (90%). If a fissure is lateral, suspect systemic conditions like Crohn’s disease, TB, or HIV. * **Sentinel Pile:** A skin tag at the lower end of a chronic fissure is a classic physical finding. * **Management:** First-line treatment is medical (sitz baths, fiber, topical nitrates/calcium channel blockers). Surgery (Lateral Internal Sphincterotomy) is reserved for chronic cases.

Question 182: Which of the following is not done in the treatment of ankylosis?

A. High condylar shave (Correct Answer)
B. Repositioning of temporal fascia
C. Ipsilateral coronoidectomy
D. Contralateral coronoidectomy

Explanation: **Explanation:** The primary objective in treating **Temporomandibular Joint (TMJ) ankylosis** is to create a functional gap and prevent re-fusion. The standard surgical protocol is **Gap Arthroplasty** or **Interpositional Arthroplasty**. **Why "High Condylar Shave" is the correct answer:** A high condylar shave (or high condylectomy) involves removing only the superior portion of the condylar head. This procedure is indicated for **Condylar Hyperplasia** or early-stage internal derangement, not ankylosis. In ankylosis, there is a dense bony or fibrous mass obliterating the joint space; a mere "shave" is insufficient to release the fusion and would lead to immediate recurrence. Instead, a radical excision of the ankylotic mass (at least 1–1.5 cm gap) is required. **Analysis of other options:** * **Repositioning of temporal fascia:** This is a form of **Interpositional Arthroplasty**. Placing a barrier (like the temporalis muscle/fascia) between the osteotomy sites is crucial to prevent re-ankylosis. * **Ipsilateral coronoidectomy:** Often, the coronoid process becomes elongated or tethered in chronic ankylosis. Removing it on the affected side is a standard step to achieve an intraoperative mouth opening of >35mm. * **Contralateral coronoidectomy:** If the mouth opening remains inadequate after ipsilateral surgery, the contralateral coronoid process must be removed, as it may be preventing the mandible from dropping due to chronic disuse atrophy and fibrosis. **NEET-PG High-Yield Pearls:** * **Kaban’s Protocol:** The gold standard surgical sequence for TMJ ankylosis. * **Most common cause:** Trauma (especially undiagnosed condylar fractures) is the #1 cause worldwide; infections are the #2 cause. * **Sawhney’s Classification:** Used to grade the severity of TMJ ankylosis (Type I to IV). * **Post-op care:** Aggressive physiotherapy is the most critical factor in preventing relapse.

Question 183: Early surgery is indicated in which of the following conditions causing peritonitis?

A. Amoebiasis peritonitis
B. Biliary peritonitis (Correct Answer)
C. Typhoid peritonitis
D. All of the above

Explanation: **Explanation:** In the management of peritonitis, the decision for surgery depends on whether the underlying cause is a chemical insult, a primary infection, or a secondary bacterial perforation. **Why Biliary Peritonitis is the Correct Answer:** Biliary peritonitis is a form of **chemical peritonitis** caused by the leakage of bile into the peritoneal cavity (often due to gallbladder perforation or post-surgical leaks). Bile is highly irritant; it causes rapid fluid shifts, severe inflammation, and carries a high risk of secondary bacterial infection. **Early surgical intervention** is mandatory to source-control the leak, perform peritoneal lavage, and prevent the rapid progression to systemic inflammatory response syndrome (SIRS) and multi-organ failure. **Analysis of Incorrect Options:** * **Amoebiasis Peritonitis:** This is typically a complication of an amoebic liver abscess rupturing into the peritoneum. The primary treatment is **medical management** with intravenous metronidazole and percutaneous aspiration/drainage. Surgery is reserved only for patients who fail to respond to medical therapy or show signs of frank fecal peritonitis. * **Typhoid Peritonitis:** While typhoid can lead to ileal perforation requiring surgery, the initial management focuses on **resuscitation and stabilization** with antibiotics. Surgery is indicated once the patient is hemodynamically stable, but it is not considered as "immediate" or "early" in the same chemical-urgency sense as a bile leak. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for Biliary Peritonitis:** Early cholecystectomy or repair of the biliary leak with thorough peritoneal toilet. * **Chemical vs. Bacterial:** Chemical peritonitis (Bile, Gastric Acid) requires faster intervention to prevent the transition to bacterial peritonitis. * **Amoebic Abscess:** "Anchovy sauce" pus is characteristic. Surgery is rarely the first-line treatment.

Question 184: Menghini's needle is used for which of the following procedures?

A. Pleural aspiration
B. Lumbar puncture
C. Kidney biopsy
D. Liver biopsy (Correct Answer)

Explanation: **Explanation:** The **Menghini needle** is a specialized instrument designed specifically for **percutaneous liver biopsy** using the "one-second" suction technique. The underlying medical concept is to minimize the time the needle remains within the liver parenchyma to reduce the risk of complications, such as bleeding or capsular tearing, which can occur due to respiratory excursions. The needle features a thin wall and a "blocker" or "stop" mechanism that prevents the aspirated tissue core from being sucked into the syringe, ensuring a high-quality cylindrical specimen. **Analysis of Incorrect Options:** * **A. Pleural aspiration:** Typically performed using a **Veress needle** (for inducing pneumothorax) or a standard wide-bore needle/cannula. * **B. Lumbar puncture:** Uses a **Spinal needle** (e.g., Quincke, Whitacre, or Sprotte needles), which are designed to atraumatically puncture the dura mater. * **C. Kidney biopsy:** Most commonly performed using a **Vim-Silverman needle** or a modern automated **Tru-Cut biopsy needle** to obtain a core of renal tissue. **Clinical Pearls for NEET-PG:** * **Vim-Silverman Needle:** Historically used for liver and kidney biopsies but largely replaced by Tru-Cut needles for better yield. * **Tru-Cut Needle:** The gold standard for "core" biopsies of solid organs (breast, prostate, kidney). * **Jamshidi Needle:** The classic needle used for **Bone Marrow Trephine Biopsy**. * **Abrams Needle:** Specifically used for **Pleural Biopsy**.

Question 185: Perirectal abscess drainage belongs to which category of surgical procedures?

A. Clean surgery
B. Contaminated surgery (Correct Answer)
C. Clean-contaminated surgery
D. Dirty surgery

Explanation: ### Explanation The classification of surgical wounds is based on the degree of microbial contamination at the time of surgery, which predicts the risk of postoperative surgical site infection (SSI). **Why "Contaminated Surgery" is correct:** A **perirectal abscess** is an acute inflammatory condition involving a collection of pus near the rectum. According to the CDC wound classification, **Contaminated (Class III)** wounds include open, fresh, accidental wounds, or operations with major breaks in sterile technique or gross spillage from the gastrointestinal tract. Crucially, it also includes incisions where **acute, non-purulent inflammation** is present. While some classifications debate the line between Class III and IV, standard surgical teaching for NEET-PG (based on Bailey & Love) categorizes the drainage of an acute inflammatory collection in a colonized area like the perianal region as **Contaminated**. **Why the other options are incorrect:** * **Clean (Class I):** These are uninfected operative wounds where no inflammation is encountered and the respiratory, alimentary, or genitourinary tracts are not entered. * **Clean-Contaminated (Class II):** These are elective procedures where the respiratory, alimentary, or genitourinary tracts are entered under controlled conditions without unusual contamination (e.g., elective cholecystectomy). * **Dirty (Class IV):** This category is reserved for old traumatic wounds with retained devitalized tissue or those involving **existing clinical infection or perforated viscera** (e.g., perforated diverticulitis or drainage of a chronic "dirty" abscess with fecal contamination). **High-Yield Clinical Pearls for NEET-PG:** * **Clean Wound SSI Risk:** <2% * **Dirty Wound SSI Risk:** Up to 40% * **Key Distinction:** If there is "pus" encountered during an operation for a pre-existing infection, it is generally upgraded to **Dirty (Class IV)**. However, in the context of acute perianal abscess drainage without visceral perforation, it is classically tested as **Contaminated**. * **Prophylactic Antibiotics:** Indicated for Class II and III; Therapeutic (not prophylactic) antibiotics are used for Class IV.

Question 186: Skin loss extending to fascia, muscle, and bone belongs to which grade of pressure sore?

A. Grade 2
B. Grade 3
C. Grade 4 (Correct Answer)
D. Grade 5

Explanation: ### Explanation Pressure sores (decubitus ulcers) are staged based on the depth of tissue damage using the **NPUAP (National Pressure Ulcer Advisory Panel)** classification. **Why Grade 4 is Correct:** **Grade 4** is characterized by **full-thickness tissue loss** with exposed bone, tendon, or muscle. Slough or eschar may be present on some parts of the wound bed. The hallmark of this stage is the extension of the injury into deep supporting structures (fascia, muscle, or bone), often making osteomyelitis a potential complication. **Analysis of Incorrect Options:** * **Grade 1:** Intact skin with **non-blanchable erythema**, usually over a bony prominence. The skin is not broken. * **Grade 2:** Partial-thickness loss of dermis. It presents as a shallow open ulcer with a red-pink wound bed or as an intact/ruptured **serum-filled blister**. * **Grade 3:** Full-thickness tissue loss. Subcutaneous fat may be visible, but **bone, tendon, or muscle are NOT exposed**. It may include undermining and tunneling. * **Grade 5:** This is not a standard NPUAP stage. However, some older classifications or specific systems refer to "Unstageable" (depth obscured by slough/eschar) or "Deep Tissue Injury." **Clinical Pearls for NEET-PG:** * **Most common site:** Sacrum (overall), followed by the ischial tuberosity and greater trochanter. * **Pathophysiology:** Occurs when external pressure exceeds **capillary filling pressure (32 mmHg)**, leading to ischemia and necrosis. * **Management:** * Grade 1 & 2: Conservative (pressure relief, dressings). * Grade 3 & 4: Often require surgical debridement and reconstructive flaps (e.g., Rotation flaps or Myocutaneous flaps). * **Prevention:** Frequent repositioning (every 2 hours) and use of air-fluidized beds.

Question 187: What is the true relationship of the sac in a femoral hernia with the pubic tubercle?

A. Above and lateral
B. Below and lateral (Correct Answer)
C. Above and medial
D. Below and medial

Explanation: ### Explanation The relationship between the hernial sac and the **pubic tubercle** is the definitive clinical landmark used to differentiate a femoral hernia from an inguinal hernia. **1. Why "Below and Lateral" is Correct:** A femoral hernia occurs through the **femoral canal**, which is located in the most medial compartment of the femoral sheath. The femoral canal lies **below** the inguinal ligament and **lateral** to the pubic tubercle. Therefore, when the hernial sac emerges through the saphenous opening (fossa ovalis) and expands into the subcutaneous tissue, its neck remains fixed below and lateral to the pubic tubercle. **2. Analysis of Incorrect Options:** * **Above and Medial (Option C):** This describes the classic position of an **Inguinal Hernia**. The superficial inguinal ring lies superior and medial to the pubic tubercle. * **Above and Lateral (Option A):** This would describe a position superior to the inguinal ligament, inconsistent with the femoral canal's anatomy. * **Below and Medial (Option D):** While the femoral canal is the most medial structure in the femoral sheath, it still remains lateral to the bony landmark of the pubic tubercle. **3. Clinical Pearls for NEET-PG:** * **The "Cough Impulse" Test:** If a swelling is below and lateral to the pubic tubercle, it is a femoral hernia; if it is above and medial, it is an inguinal hernia. * **Gender Predilection:** Femoral hernias are more common in **females** (due to a wider pelvis), though inguinal hernias remain the most common hernia overall in both sexes. * **High Risk of Strangulation:** The femoral canal has rigid boundaries (Lacunar ligament medially, Inguinal ligament anteriorly). This makes femoral hernias highly prone to incarceration and strangulation; thus, they should always be repaired surgically. * **McVay Repair:** This is a classic surgical technique used for femoral hernia repair, involving the suturing of the conjoint tendon to Cooper’s (pectineal) ligament.

Question 188: Pascal's law is utilized in which technique of hernia repair?

A. Lichtenstein mesh repair
B. Stoppa's preperitoneal repair (Correct Answer)
C. Bassini's repair
D. Darning repair

Explanation: ### Explanation **Correct Answer: B. Stoppa's preperitoneal repair** **Underlying Concept:** Pascal’s Law states that pressure applied to a confined fluid is transmitted equally in all directions. In the context of hernia surgery, Stoppa’s repair (Giant Prosthetic Reinforcement of the Visceral Sac - GPRVS) utilizes this principle by placing a large mesh in the **preperitoneal space**. When intra-abdominal pressure increases (due to coughing or straining), the pressure is transmitted equally across the large mesh. This force effectively presses the mesh more firmly against the posterior aspect of the abdominal wall, using the body's own internal pressure to keep the "plug" in place and prevent herniation. **Why Incorrect Options are Wrong:** * **A. Lichtenstein mesh repair:** This is a "tension-free" repair where the mesh is placed **onlay** (over the transversalis fascia). It relies on mechanical strength and fibrosis rather than Pascal’s Law. * **C. Bassini's repair:** A traditional tissue-based repair involving the sutured apposition of the conjoint tendon to the inguinal ligament. It creates tension and does not involve the preperitoneal physics of Pascal’s Law. * **D. Darning repair:** A tension-free tissue repair using continuous nylon sutures to create a "lattice" or "darn" between the conjoint tendon and inguinal ligament. **High-Yield Clinical Pearls for NEET-PG:** * **Stoppa’s Repair** is the procedure of choice for **bilateral recurrent hernias** or complex multi-focal hernias (e.g., "bilateral disaster" hernias). * The mesh used in Stoppa’s repair is placed in the **Space of Bogros**. * **Nyhus Classification:** Stoppa’s repair is typically indicated for Type IV hernias (recurrent). * **Key Anatomical Landmark:** The "Triangle of Doom" and "Triangle of Pain" are critical landmarks in preperitoneal/laparoscopic repairs to avoid nerve and vascular injury.

Question 189: Which of the following is a common tumor of the anterior mediastinum?

A. Thymoma (Correct Answer)
B. Neurogenic tumor
C. Lymphoma
D. Meningocele

Explanation: The mediastinum is anatomically divided into compartments, each characterized by specific resident structures and associated pathologies. The **anterior mediastinum** (the space between the sternum and the pericardium) is the most common site for mediastinal masses. ### **Explanation of Options** * **A. Thymoma (Correct):** Thymoma is the most common primary tumor of the anterior mediastinum in adults. It originates from the epithelial cells of the thymus. Other common anterior mediastinal masses are often remembered by the **"4 Ts" mnemonic**: **T**hymoma, **T**eratoma (and other Germ Cell Tumors), **T**errible Lymphoma, and **T**hyroid (Retrosternal Goiter). * **B. Neurogenic Tumor:** These are the most common tumors of the **posterior mediastinum**. They arise from peripheral nerves (e.g., Schwannoma, Neurofibroma) or the sympathetic chain (e.g., Ganglioneuroma). * **C. Lymphoma:** While lymphoma can occur in the anterior mediastinum (as part of the 4 Ts), it is generally considered the second most common after thymoma. In the context of "most common primary tumor," Thymoma is the preferred answer. * **D. Meningocele:** This is a rare cystic lesion found in the **posterior mediastinum**, often associated with vertebral anomalies. ### **High-Yield Clinical Pearls for NEET-PG** * **Myasthenia Gravis Association:** Approximately 30–45% of patients with thymoma have Myasthenia Gravis. Conversely, only 10–15% of patients with Myasthenia Gravis have a thymoma (though 65% have thymic hyperplasia). * **Imaging Gold Standard:** Contrast-Enhanced Computed Tomography (CECT) is the investigation of choice for evaluating mediastinal masses. * **Age Factor:** In children, neurogenic tumors (posterior) are more common, whereas in adults, thymomas (anterior) predominate. * **Surgical Approach:** Most anterior mediastinal tumors are approached via a **median sternotomy**, while posterior tumors are approached via **thoracotomy**.

Question 190: Sistrunk operation is the preferred treatment for which of the following conditions?

A. Retrosternal goiter
B. Endemic goiter
C. Thyroglossal cyst (Correct Answer)
D. Adrenal incidentaloma

Explanation: **Explanation:** The **Sistrunk operation** is the gold-standard surgical procedure for a **Thyroglossal cyst**. The underlying medical concept is based on the embryological descent of the thyroid gland. The thyroglossal duct extends from the *foramen caecum* at the base of the tongue to the thyroid's final position. Crucially, this duct is intimately associated with the **hyoid bone**, often passing through or just behind it. To prevent the high rate of recurrence (approx. 50% with simple excision), the Sistrunk procedure involves: 1. Excision of the cyst. 2. Removal of the **central portion of the hyoid bone**. 3. Excision of a core of muscle/tissue up to the foramen caecum. **Analysis of Incorrect Options:** * **A & B (Retrosternal and Endemic Goiter):** These are thyroid parenchymal diseases. Treatment usually involves medical management or various forms of thyroidectomy (e.g., Total or Subtotal Thyroidectomy), not Sistrunk’s. * **D (Adrenal Incidentaloma):** This is an asymptomatic adrenal mass found on imaging. Management depends on size and functional status, typically involving observation or laparoscopic adrenalectomy. **Clinical Pearls for NEET-PG:** * **Most common site:** Subhyoid (infrahyoid). * **Clinical sign:** The cyst moves upward on **protrusion of the tongue** (due to attachment to the foramen caecum) and on deglutition. * **Complication:** The most common malignancy arising in a thyroglossal cyst is **Papillary Thyroid Carcinoma**. * **Pre-op must-do:** Always perform an ultrasound to ensure a normal thyroid gland is present in the neck; the cyst may contain the only functioning thyroid tissue (ectopic thyroid).

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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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