General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 631: Which of the following is a true congenital hernia through the foramen of Bochdalek?

A. Congenital hernia (Correct Answer)
B. Is asymptomatic
C. Seen especially in males
D. Least common

Explanation: **Explanation:** The **Bochdalek hernia** is the most common type of congenital diaphragmatic hernia (CDH), occurring due to the failure of the **pleuroperitoneal membrane** to fuse with the septum transversum and dorsal mesentery of the esophagus during the 8th–10th week of gestation. **Why Option A is Correct:** It is a **true congenital hernia** because it results from a developmental defect present at birth. It occurs through the posterolateral foramen (Foramen of Bochdalek), most commonly on the **left side (80-90%)** because the left pleuroperitoneal canal closes later than the right, and the liver provides a protective barrier on the right side. **Analysis of Incorrect Options:** * **Option B (Is asymptomatic):** Incorrect. It is rarely asymptomatic. It typically presents in the neonatal period with severe **respiratory distress**, cyanosis, and a scaphoid abdomen due to pulmonary hypoplasia and displacement of abdominal viscera into the thorax. * **Option C (Seen especially in males):** Incorrect. There is no significant male predilection; it affects both sexes relatively equally, though some studies suggest a very slight male predominance, it is not a defining characteristic. * **Option D (Least common):** Incorrect. Bochdalek hernia is the **most common** type of CDH (approx. 95%), whereas Morgagni hernia (retrosternal/anterior) is the least common (approx. 2-5%). **NEET-PG High-Yield Pearls:** * **Triad of CDH:** Dyspnea, Cyanosis, and Scaphoid abdomen. * **Most common cause of death:** Pulmonary hypoplasia and persistent pulmonary hypertension. * **Radiology:** Chest X-ray shows gas-filled loops of bowel in the hemithorax and a mediastinal shift to the opposite side. * **Management:** It is a **medical, not surgical, emergency**. Initial stabilization (intubation, avoid bag-mask ventilation to prevent bowel distension) is crucial before surgical repair.

Question 632: Which of the following best describes dry socket?

A. Results from loss of the blood clot in the socket. (Correct Answer)
B. Is treated by reintroducing bleeding into the socket.
C. Is a form of osteomyelitis.
D. Is common in the extraction of anterior teeth.

Explanation: **Explanation:** **Dry Socket**, medically known as **Alveolar Osteitis**, is a painful dental complication following tooth extraction. **1. Why Option A is Correct:** The core pathophysiology involves the **premature lysis or loss of the blood clot** (fibrinolysis) that normally fills the extraction socket. This clot serves as a scaffold for new bone growth and protects the underlying bone and nerve endings. When the clot is lost, the alveolar bone is exposed to the oral environment, saliva, and bacteria, leading to severe, radiating pain typically starting 3–5 days post-extraction. **2. Why the Other Options are Incorrect:** * **Option B:** Treatment focuses on **palliative care**, not re-inducing bleeding. Re-curretting the socket to induce a new clot is generally contraindicated as it can spread infection and increase pain. Management involves gentle irrigation with saline and placing a sedative dressing (e.g., Zinc Oxide Eugenol). * **Option C:** It is a **localized inflammation** of the alveolar bone, not a true osteomyelitis (which involves marrow space infection and systemic symptoms). There is no suppuration or fever. * **Option D:** It is most common in the **mandibular third molars** (lower wisdom teeth), not anterior teeth, due to the higher density of bone and decreased vascularity in the posterior mandible. **Clinical Pearls for NEET-PG:** * **Risk Factors:** Smoking (most significant), oral contraceptives (estrogen increases fibrinolysis), traumatic extraction, and poor oral hygiene. * **Key Symptom:** Severe pain that is out of proportion to clinical signs, often associated with **halitosis** (foul odor). * **Prevention:** Prophylactic antibiotics (in high-risk cases) and avoiding straws or smoking post-surgery to prevent dislodging the clot.

Question 633: What is the most common tumor of the retroperitoneum?

A. Stroma
B. Sarcoma (Correct Answer)
C. Teratoma
D. Retro-teratoma

Explanation: **Explanation:** The retroperitoneum is a complex anatomical space containing various mesenchymal, neural, and germ cell tissues. Among primary retroperitoneal tumors (PRTs), **Sarcomas** are the most common histological type, accounting for approximately **70-80%** of all primary malignant retroperitoneal masses in adults. **1. Why Sarcoma is correct:** Primary retroperitoneal tumors are predominantly malignant, and the majority arise from mesenchymal elements (fat, muscle, or connective tissue). The most frequent subtypes encountered are **Liposarcoma** (most common), followed by Leiomyosarcoma and Pleomorphic Undifferentiated Sarcoma. These tumors often present late because the retroperitoneal space is distensible, allowing them to reach a massive size before causing symptoms. **2. Why other options are incorrect:** * **Stroma:** While "stromal" refers to the connective tissue framework, it is a general histological term and not a specific tumor classification in this context (unlike GIST in the GI tract). * **Teratoma:** These are germ cell tumors. While they occur in the retroperitoneum (especially in infants and children), they are significantly less common than sarcomas in the adult population. * **Retro-teratoma:** This is not a standard medical classification for retroperitoneal tumors. **Clinical Pearls for NEET-PG:** * **Most common primary retroperitoneal tumor:** Sarcoma. * **Most common subtype of retroperitoneal sarcoma:** Liposarcoma. * **Gold Standard Investigation:** Contrast-Enhanced CT (CECT) scan (helps in assessing origin and vessel involvement). * **Treatment of choice:** Radical surgical resection with clear margins (R0 resection). These tumors are notoriously resistant to chemotherapy and radiotherapy. * **Rule of thumb:** 80% of primary retroperitoneal masses are malignant; of those, 80% are sarcomas.

Question 634: What is the most common complication of splenectomy?

A. Pancreatic leak
B. Pulmonary complications (Correct Answer)
C. Pneumococcal peritonitis
D. Hemorrhage

Explanation: **Explanation:** **Pulmonary complications** are the most common overall complications following a splenectomy, occurring in approximately 15–30% of cases. The proximity of the spleen to the left diaphragm leads to postoperative diaphragmatic irritation, splinting, and shallow breathing. This results in a spectrum of issues, most commonly **left-sided basal atelectasis**, followed by pleural effusion and pneumonia. **Analysis of Options:** * **A. Pancreatic leak:** While the tail of the pancreas lies in the splenic hilum and can be injured during hilar dissection, it is a specific technical complication rather than the most common one. * **C. Pneumococcal peritonitis:** This is a manifestation of Overwhelming Post-Splenectomy Infection (OPSI). While OPSI is the most *feared* and lethal complication, its incidence is low (approx. 1–2%). * **D. Hemorrhage:** Postoperative bleeding (often from the short gastric arteries or splenic pedicle) is a serious early complication but occurs less frequently than pulmonary issues. **High-Yield Clinical Pearls for NEET-PG:** * **Most common complication:** Atelectasis (Pulmonary). * **Most common cause of OPSI:** *Streptococcus pneumoniae* (followed by *H. influenzae* and *N. meningitidis*). * **Vaccination Protocol:** Ideally 2 weeks *before* elective surgery or 2 weeks *after* emergency surgery (to ensure optimal functional antibody response). * **Hematological finding:** Presence of **Howell-Jolly bodies**, Pappenheimer bodies, and Heinz bodies on peripheral smear post-splenectomy. * **Post-splenectomy Sepsis:** Risk is highest in children and within the first 2 years post-surgery.

Question 635: Which of the following nutrients are not typically included in standard Total Parental Nutrition formulations?

A. Lipids
B. Carbohydrates
C. Proteins
D. Dietary Fiber (Correct Answer)

Explanation: **Explanation:** The core principle of **Total Parenteral Nutrition (TPN)** is the intravenous administration of all necessary nutrients to bypass the gastrointestinal tract. Because TPN is delivered directly into the bloodstream (usually via a central venous catheter), all components must be in their simplest, most soluble forms. **Why Dietary Fiber is the Correct Answer:** Dietary fiber consists of non-digestible carbohydrates that require the mechanical and bacterial processes of the **large intestine** to function. Fiber is insoluble and cannot be broken down into a form that is safe for intravenous injection. Injecting fiber into the bloodstream would cause immediate vascular occlusion and embolic phenomena. Therefore, fiber is strictly an enteral nutrient. **Analysis of Incorrect Options:** * **A. Lipids:** Included as fat emulsions (e.g., soybean oil) to provide a concentrated source of energy and essential fatty acids. They help prevent Essential Fatty Acid Deficiency (EFAD). * **B. Carbohydrates:** Provided in the form of **Dextrose monohydrate**. It is the primary energy source in TPN, typically providing 3.4 kcal/gram. * **C. Proteins:** Provided as **crystalline L-amino acids**. These are essential for maintaining a positive nitrogen balance and preventing muscle wasting in catabolic states. **High-Yield Clinical Pearls for NEET-PG:** * **Caloric Content:** Dextrose (3.4 kcal/g), Protein (4 kcal/g), Lipids (9 kcal/g). * **Complications:** The most common metabolic complication of TPN is **Hyperglycemia**. The most common life-threatening complication is **Catheter-related bloodstream infection (CRBSI)**, often due to *Staphylococcus aureus* or *Candida*. * **Refeeding Syndrome:** Characterized by severe **Hypophosphatemia**, Hypokalemia, and Hypomagnesemia when nutrition is reintroduced too rapidly in malnourished patients. * **Monitoring:** Liver function tests must be monitored as long-term TPN can lead to **steatosis (TPN-induced cholestasis)**.

Question 636: Postoperatively, wound dehiscence most commonly occurs between which time frame?

A. 1-2 days
B. 3-5 days
C. 5-8 days (Correct Answer)
D. 8-12 days

Explanation: **Explanation:** Wound dehiscence (burst abdomen) is a serious postoperative complication where the layers of a surgical incision separate. The correct answer is **5-8 days** because this period represents the "lag phase" or the transition between the inflammatory and proliferative phases of wound healing. **Why 5-8 days?** During the first few days, the strength of the wound depends entirely on the sutures. Between days 5 and 8, the initial fibrin clot is being broken down, but the synthesis of new collagen (Type III) has not yet reached sufficient tensile strength to support the wound independently. This creates a "biological window of weakness." Furthermore, this is often when postoperative coughing, distension, or straining (factors that increase intra-abdominal pressure) are most prevalent. **Analysis of Incorrect Options:** * **1-2 days:** Too early. The wound is still in the early inflammatory phase, and the sutures are at their maximum holding strength. * **3-5 days:** While dehiscence can begin here, the peak incidence occurs slightly later as the inflammatory response peaks. * **8-12 days:** By this time, fibroplasia is well underway, and collagen cross-linking has significantly increased the tensile strength of the wound, making dehiscence less likely. **NEET-PG High-Yield Pearls:** * **Earliest Sign:** The most common precursor to dehiscence is the discharge of **serosanguinous (pinkish) fluid** from the wound. * **Most Common Cause:** Technical error (poor suturing technique) is the most common preventable cause. * **Risk Factors:** Malnutrition (hypoalbuminemia), anemia, jaundice, malignancy, and increased intra-abdominal pressure (chronic cough, ascites). * **Management:** Immediate management involves covering the wound with sterile saline-soaked gauze, followed by urgent surgical re-closure (tension-band sutures).

Question 637: Which of the following is NOT a complication of Total Parenteral Nutrition (TPN)?

A. Aspiration pneumonia (Correct Answer)
B. Hypokalemia
C. Hypoglycemia
D. Hyperglycemia

Explanation: **Explanation:** The correct answer is **A. Aspiration pneumonia**. Total Parenteral Nutrition (TPN) involves the intravenous administration of nutrients, bypassing the gastrointestinal (GI) tract entirely. **Aspiration pneumonia** is a complication associated with **Enteral Nutrition** (tube feeding), where gastric contents or formula may be refluxed and inhaled into the lungs. Since TPN does not involve the stomach or esophagus, it cannot cause aspiration. **Analysis of Incorrect Options:** * **B. Hypokalemia:** This is a common feature of **Refeeding Syndrome**. When insulin is released in response to TPN glucose, it causes an intracellular shift of potassium, magnesium, and phosphate, leading to low serum levels. * **C. Hypoglycemia:** This typically occurs as **rebound hypoglycemia** if TPN is discontinued abruptly. The body’s high endogenous insulin levels (stimulated by the TPN) persist briefly after the infusion stops, causing blood sugar to drop. * **D. Hyperglycemia:** This is the most common metabolic complication of TPN. It occurs due to rapid infusion rates, physiological stress, or underlying insulin resistance, often requiring exogenous insulin scale coverage. **High-Yield Clinical Pearls for NEET-PG:** * **Most common complication of TPN:** Hyperglycemia. * **Most common infectious complication:** Catheter-related bloodstream infection (CRBSI), often due to *Staphylococcus aureus* or *Candida*. * **Refeeding Syndrome:** Characterized by **Hypophosphatemia** (the hallmark), hypokalemia, and hypomagnesemia. * **Hepatobiliary complications:** Long-term TPN can lead to cholestasis, gallstones (due to lack of CCK-mediated gallbladder contraction), and steatosis.

Question 638: What is the treatment of choice for Idiopathic Thrombocytopenic Purpura?

A. Steroids (Correct Answer)
B. Intravenous immunoglobulin
C. Blood transfusion
D. Splenectomy

Explanation: ### Explanation **Idiopathic Thrombocytopenic Purpura (ITP)**, now more commonly referred to as Immune Thrombocytopenic Purpura, is an autoimmune disorder characterized by the destruction of platelets by anti-platelet antibodies (IgG), primarily in the spleen. **Why Steroids are the Correct Answer:** Corticosteroids (e.g., Prednisolone or Dexamethasone) are the **first-line treatment of choice** for ITP. They work by decreasing the production of autoantibodies and reducing the clearance of antibody-coated platelets by splenic macrophages. Most patients show a rapid increase in platelet counts within days of initiating therapy. **Analysis of Incorrect Options:** * **B. Intravenous Immunoglobulin (IVIg):** While highly effective, IVIg is reserved for emergency situations (e.g., life-threatening bleeding or pre-operative stabilization) where a rapid rise in platelet count is required. It is not the standard initial treatment due to cost and transient effects. * **C. Blood Transfusion:** This is generally avoided. Platelet transfusions are ineffective because the autoantibodies will destroy the donor platelets as quickly as the patient's own. It is only considered in catastrophic, life-threatening hemorrhage. * **D. Splenectomy:** This is the **most effective second-line treatment** for patients who are refractory to steroids or require high maintenance doses. It is not the initial treatment of choice. **Clinical Pearls for NEET-PG:** * **Indication for Treatment:** Usually initiated when platelet counts are **<30,000/µL** or if there is active mucosal bleeding. * **Splenectomy Timing:** If required, it should ideally be delayed for at least 6–12 months to allow for spontaneous remission, especially in children. * **Vaccination:** Patients undergoing splenectomy must receive vaccinations against encapsulated organisms (*S. pneumoniae, H. influenzae, N. meningitidis*) at least 2 weeks prior to surgery. * **Second-line Medical Therapy:** Includes Rituximab and TPO-receptor agonists (Eltrombopag, Romiplostim).

Question 639: Which of the following is the most difficult impaction of a third molar?

A. Mesioangular impaction
B. Vertical impacted tooth
C. Partially impacted tooth
D. Distoangular impacted tooth (Correct Answer)

Explanation: The difficulty of extracting an impacted mandibular third molar is primarily determined by its orientation relative to the second molar and the path of exit. This is classified using **Winter’s Classification**. ### **Why Distoangular is the Most Difficult** In a **distoangular impaction**, the crown of the third molar is tilted posteriorly toward the ramus of the mandible, while the roots are positioned close to the second molar. * **Path of Withdrawal:** The tooth's natural path of exit is directed into the thick bone of the mandibular ramus. * **Surgical Access:** It is the most inaccessible position, requiring extensive bone removal and tooth sectioning because the tooth must be moved "backward" into the ramus before it can be lifted out. ### **Analysis of Other Options** * **A. Mesioangular Impaction:** This is the **most common** type and the **easiest** to extract. The tooth is tilted toward the second molar, and its path of exit is relatively unobstructed. * **B. Vertical Impaction:** The tooth is parallel to the long axis of the second molar. It is generally of moderate difficulty, easier than distoangular but harder than mesioangular. * **C. Partially Impacted:** While partial impactions are prone to pericoronitis, the "difficulty" in surgical terms refers to the angulation and bone coverage. A partially erupted tooth usually requires less bone guttering than a full bony impaction. ### **NEET-PG High-Yield Pearls** * **Winter’s Classification:** Based on the angulation of the impacted tooth to the long axis of the second molar. * **Pell and Gregory Classification:** Based on the depth of the tooth (A, B, C) and the space available in the ramus (1, 2, 3). * **Order of Frequency:** Mesioangular (most common) > Vertical > Distoangular > Horizontal. * **Order of Difficulty:** Distoangular (hardest) > Horizontal > Vertical > Mesioangular (easiest).

Question 640: Hydatid disease is caused by which of the following organisms?

A. Echinococcus (Correct Answer)
B. Hymenolepis
C. Diphyllobothrium
D. Taenia

Explanation: **Explanation:** **Hydatid disease** (Cystic Echinococcosis) is a parasitic infection caused by the larval stage of the tapeworm **Echinococcus granulosus**. Humans act as accidental intermediate hosts in the life cycle, typically through the ingestion of food or water contaminated with eggs from the feces of the definitive host (dogs). The larvae penetrate the intestinal mucosa, enter the portal circulation, and most commonly lodge in the **liver** (70%), followed by the lungs (20%). **Why other options are incorrect:** * **Hymenolepis:** *H. nana* (dwarf tapeworm) is the most common cause of all cestode infections in humans but causes intestinal symptoms, not hydatid cysts. * **Diphyllobothrium:** Known as the fish tapeworm, it is associated with **Vitamin B12 deficiency** and megaloblastic anemia. * **Taenia:** *T. solium* (pork tapeworm) causes cysticercosis (Neurocysticercosis), characterized by small parenchymal cysts, unlike the large, fluid-filled unilocular cysts seen in Hydatid disease. **High-Yield Clinical Pearls for NEET-PG:** * **Pathognomonic Sign:** Presence of "daughter cysts" and "hydatid sand" within the mother cyst. * **Radiology:** Look for the **"Water Lily Sign"** (detached endocyst membrane) or **"Whirl Sign"** on USG/CT. * **Classification:** The **Gharbi Classification** or WHO classification is used to stage the cysts. * **Treatment:** **PAIR** (Puncture, Aspiration, Injection, Re-aspiration) is a minimally invasive option. Medical management involves **Albendazole**. * **Complication:** Spillage of cyst fluid can lead to life-threatening **Anaphylactic shock**.

Practice by Chapter

Wound Healing and Care

Practice Questions

Surgical Infections

Practice Questions

Fluid and Electrolyte Management

Practice Questions

Nutrition in Surgical Patients

Practice Questions

Hemostasis and Blood Transfusion

Practice Questions

Surgical Instruments and Equipment

Practice Questions

Sutures and Stapling Devices

Practice Questions

Minimal Access Surgery Principles

Practice Questions

Surgical Complications

Practice Questions

Anesthesia Principles for Surgeons

Practice Questions

Surgical Oncology Principles

Practice Questions

Evidence-Based Surgery

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free