General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 121: All are genetic conditions with increased risk of malignancy except?

A. Gorlin's syndrome
B. Xeroderma pigmentosum
C. Ferguson-Smith syndrome
D. Neurofibromatosis (Correct Answer)

Explanation: **Explanation:** The correct answer is **Neurofibromatosis (Option D)**. While this may seem counterintuitive because Neurofibromatosis (NF1 and NF2) is associated with tumors (like neurofibromas, optic gliomas, and acoustic neuromas), the question specifically asks for conditions with an increased risk of **malignancy** relative to the others. In the context of dermatological surgery and syndromic associations, NF is primarily characterized by benign nerve sheath tumors. While malignant peripheral nerve sheath tumors (MPNST) can occur, the other three options are classical "genodermatoses" where the primary clinical hallmark is a high predisposition to aggressive skin cancers. **Analysis of Options:** * **Gorlin’s Syndrome (Nevoid Basal Cell Carcinoma Syndrome):** Caused by a mutation in the *PTCH1* gene. It is characterized by multiple Basal Cell Carcinomas (BCCs) appearing at a young age, odontogenic keratocysts, and bifid ribs. * **Xeroderma Pigmentosum:** A defect in nucleotide excision repair (DNA repair mechanism). It leads to an extreme sensitivity to UV light, resulting in a nearly 100% risk of developing Squamous Cell Carcinomas (SCC), BCCs, and Melanomas. * **Ferguson-Smith Syndrome:** Also known as multiple self-healing squamous epitheliomas. It is an autosomal dominant condition where patients develop multiple lesions histologically identical to Keratoacanthomas/SCCs that may locally regress but represent a clear malignant predisposition. **Clinical Pearls for NEET-PG:** * **Gorlin’s Triad:** Multiple BCCs, Odontogenic Keratocysts (OKC), and Calcification of Falx Cerebri. * **Xeroderma Pigmentosum:** Most common cause of death is skin malignancy (SCC/Melanoma). * **Neurofibromatosis Type 1 (von Recklinghausen):** Look for Lisch nodules (iris hamartomas), Café-au-lait spots, and axillary freckling (Crowe’s sign). * **High-Yield Fact:** If the question asks for the most common malignancy in NF1, it is the **Malignant Peripheral Nerve Sheath Tumor (MPNST)**, but the baseline risk is lower compared to the obligate malignancy syndromes listed above.

Question 122: Which of the following conditions does not typically present with bleeding per rectum?

A. Carcinoma of the rectum
B. Sigmoid volvulus (Correct Answer)
C. Inflammation of Meckel's diverticulum
D. Enteric fever

Explanation: **Explanation:** The correct answer is **Sigmoid Volvulus**. **1. Why Sigmoid Volvulus is the correct choice:** Sigmoid volvulus is a mechanical obstruction caused by the twisting of the sigmoid colon around its mesenteric axis. The hallmark clinical presentation is a triad of **sudden abdominal pain, absolute constipation (obstipation), and massive abdominal distension**. While it can lead to gangrene if the blood supply is compromised (strangulation), it typically presents as an acute intestinal obstruction rather than a bleeding manifestation. Bleeding per rectum is not a characteristic feature of this condition. **2. Analysis of Incorrect Options:** * **Carcinoma of the rectum:** This is a classic cause of "bright red" bleeding per rectum (hematochezia), often mixed with mucus (spurious diarrhea) and associated with tenesmus. * **Meckel’s Diverticulum:** While inflammation (Meckel’s diverticulitis) mimics appendicitis, the most common presentation in children is painless massive bleeding per rectum due to ectopic gastric mucosa causing ulceration of the adjacent ileal wall. * **Enteric Fever (Typhoid):** In the 3rd week of infection, hyperplasia and subsequent necrosis of Peyer’s patches in the terminal ileum can lead to intestinal perforation or significant gastrointestinal hemorrhage. **Clinical Pearls for NEET-PG:** * **Sigmoid Volvulus X-ray:** Look for the "Coffee Bean sign" or "Omega sign." The apex of the loop usually points toward the Right Upper Quadrant. * **Management:** Initial treatment for stable sigmoid volvulus is **sigmoidoscopic detorsion** (using a flatus tube). If gangrene is suspected, emergency resection (Hartmann’s procedure) is required. * **Meckel's Diverticulum Rule of 2s:** 2 inches long, 2 feet from the ileocecal valve, 2% of the population, presents by age 2, and contains 2 types of ectopic tissue (Gastric/Pancreatic).

Question 123: What is the most common type of cyst found in the spleen?

A. Hydatid cyst
B. Dermoid cyst
C. Pseudocyst (Correct Answer)
D. Lymphangioma

Explanation: **Explanation:** Splenic cysts are broadly classified into **Primary (True) cysts**, which possess an epithelial lining, and **Secondary (False) cysts**, which lack one. **Why Pseudocyst is correct:** Pseudocysts (Secondary cysts) are the **most common** type of splenic cyst, accounting for approximately **75-80%** of all non-parasitic splenic cysts. They typically develop as a late complication of **trauma** (post-traumatic), though they can also result from splenic infarction or infection. Because they lack a cellular lining and are composed of fibrous tissue, they are termed "pseudocysts." **Analysis of Incorrect Options:** * **Hydatid Cyst (Option A):** Caused by *Echinococcus granulosus*, this is the most common **parasitic** cyst of the spleen. While common in endemic areas, it is less frequent globally than post-traumatic pseudocysts. * **Dermoid Cyst (Option B):** These are extremely rare primary (true) cysts of the spleen. They are congenital and contain skin appendages. * **Lymphangioma (Option C):** This is a benign malformation of the lymphatic system. While it is the most common **primary benign neoplasm** of the spleen that can appear cystic, it is not the most common splenic cyst overall. **High-Yield Clinical Pearls for NEET-PG:** * **True Cysts:** Most common is the **Epidermoid cyst** (congenital, possesses epithelial lining, often positive for CEA or CA 125). * **Imaging:** Ultrasound is the first-line investigation; CT is used for surgical planning. * **Management:** Small, asymptomatic cysts (<5 cm) are managed conservatively. Large or symptomatic cysts require **Spleen-preserving surgery** (e.g., partial splenectomy or cyst decortication) to avoid Post-Splenectomy Overwhelming Infection (OPSI).

Question 124: What is a felon?

A. Infection of the nail fold
B. Infection of the ulnar bursa
C. Infection of the pulp space (Correct Answer)
D. Infection of the distal interphalangeal joint

Explanation: **Explanation:** A **felon** is an acute, closed-space infection of the **pulp space** of the fingertip. The pulp space is anatomically unique because it is divided into numerous small, non-compliant compartments by tough fibrous septa that extend from the periosteum of the distal phalanx to the skin. When infection occurs (usually due to *Staphylococcus aureus* following a minor prick), the resulting inflammatory edema causes a rapid rise in pressure within these tight compartments. This leads to intense, throbbing pain and can compromise local blood flow, potentially resulting in **necrosis** or **osteomyelitis** of the distal phalanx. **Analysis of Incorrect Options:** * **Option A (Infection of the nail fold):** This is termed **Paronychia**. It is the most common infection of the hand and involves the soft tissue surrounding the nail plate. * **Option B (Infection of the ulnar bursa):** This refers to a deep space infection of the hand. The ulnar bursa encloses the flexor tendons of the little finger and the common flexor sheath in the palm. * **Option D (Infection of the distal interphalangeal joint):** This is **Septic Arthritis** of the DIP joint, which presents with joint line tenderness and painful restricted range of motion, rather than isolated pulp swelling. **Clinical Pearls for NEET-PG:** * **Management:** Early incision and drainage are critical. The incision is typically made where the tenderness is maximal (lateral longitudinal incision) to avoid damaging the digital nerves and to divide the fibrous septa. * **Complication:** If untreated, the pressure can cause pressure necrosis of the distal 4/5ths of the terminal phalanx (the base is spared as its blood supply comes from the digital artery before it enters the pulp space). * **Kanavel’s Signs:** Remember these are associated with **Flexor Tenosynovitis**, not a felon.

Question 125: According to the Parkland formula, what is the amount of Ringer's Lactate (RL) given in 24 hours for burn patients?

A. Percentage of burns * weight (kg) * 2
B. Percentage of burns * weight (kg) * 3
C. Percentage of burns * weight (kg) * 4 (Correct Answer)
D. Percentage of burns * weight (kg) * 5

Explanation: **Explanation:** The **Parkland Formula** is the gold standard for fluid resuscitation in burn patients during the first 24 hours following a thermal injury. The physiological basis for this formula is the massive fluid shift from the intravascular to the interstitial space due to increased capillary permeability (SIRS response). **Correct Answer (C):** The formula is calculated as **4 mL × Body Weight (kg) × Total Body Surface Area (TBSA) %**. * **Fluid of Choice:** Ringer’s Lactate (RL) is preferred because its composition is most similar to extracellular fluid and it helps prevent hyperchloremic metabolic acidosis (common with Normal Saline). * **Administration Schedule:** 50% of the total calculated volume is given in the **first 8 hours** (from the time of injury, not arrival), and the remaining 50% is given over the next 16 hours. **Incorrect Options:** * **Option A (2 mL):** This is the **Modified Brooke Formula**, often used in some centers to avoid "fluid creep" (over-resuscitation), but it is not the Parkland standard. * **Option B (3 mL):** This volume is typically used in the **Modified Parkland Formula** for pediatric patients or specific guidelines for chemical burns, but it does not represent the classic Parkland calculation. * **Option D (5 mL):** This exceeds the standard requirement and increases the risk of pulmonary edema and abdominal compartment syndrome. **High-Yield NEET-PG Pearls:** 1. **Rule of 9s:** Used to calculate TBSA. Note that 1st-degree burns (erythema only) are **excluded** from the calculation. 2. **Monitoring:** The best indicator of adequate fluid resuscitation is **Urine Output**. Target: **0.5–1.0 mL/kg/hr** in adults and **1.0 mL/kg/hr** in children. 3. **Pediatrics:** Children require maintenance fluids (Dextrose-containing) in addition to the Parkland formula due to limited glycogen stores.

Question 126: Leriche syndrome is caused by which of the following obstructions?

A. Aortoiliac obstruction (Correct Answer)
B. Iliac obstruction
C. Femoropopliteal obstruction
D. Distal obstruction

Explanation: **Explanation:** **Leriche Syndrome**, also known as **Aortoiliac Occlusive Disease**, is a specific pattern of peripheral arterial disease (PAD) characterized by the chronic thrombotic occlusion of the distal abdominal aorta just above its bifurcation, often extending into the common iliac arteries. 1. **Why Aortoiliac obstruction is correct:** The syndrome is defined by a classic clinical triad resulting from ischemia in the distribution of the distal aorta and internal/external iliac arteries: * **Claudication:** Pain in the buttocks, hips, or thighs during exercise. * **Erectile Dysfunction:** Due to decreased blood flow in the internal iliac (hypogastric) arteries. * **Absent/Diminished Femoral Pulses:** Reflecting the proximal nature of the obstruction. 2. **Why other options are incorrect:** * **Iliac obstruction (B):** While iliac involvement is part of the syndrome, isolated iliac obstruction does not typically present with the full systemic triad (especially the specific aortic involvement) associated with Leriche. * **Femoropopliteal obstruction (C):** This involves the superficial femoral or popliteal arteries. It presents with calf claudication and preserved femoral pulses, unlike Leriche syndrome. * **Distal obstruction (D):** This refers to infrapopliteal or "trash foot" scenarios, which present with foot pain or gangrene rather than proximal hip/buttock symptoms. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Strongly associated with smoking, hyperlipidemia, and atherosclerosis. * **Diagnosis:** The gold standard for anatomical mapping is **CT Angiography** or Digital Subtraction Angiography (DSA). * **Management:** Initial treatment involves smoking cessation and statins. Surgical options include **Aortobifemoral bypass** (gold standard for extensive disease) or endovascular stenting for focal lesions. * **Key Differentiator:** If a question mentions "buttock claudication + impotence," always think **Leriche Syndrome (Aortoiliac)**.

Question 127: A patient with ameloblastoma of the jaw can best be treated by?

A. Irradiation
B. Excision
C. Enucleation
D. Surgical removal followed by cauterization (Correct Answer)

Explanation: **Explanation:** Ameloblastoma is a benign but locally aggressive odontogenic tumor with a high propensity for recurrence. The primary goal of treatment is complete eradication while minimizing morbidity. **Why Option D is Correct:** Ameloblastoma is characterized by "micro-extensions" or pseudopods that penetrate the surrounding cancellous bone beyond the visible tumor margin. **Surgical removal (resection) followed by cauterization** (chemical or thermal) is the preferred approach because the cauterization helps destroy any microscopic residual tumor cells in the periphery. This combined approach significantly reduces the high recurrence rates associated with simple removal. **Why Other Options are Incorrect:** * **A. Irradiation:** Ameloblastomas are generally **radioresistant**. Radiation is reserved only for inoperable cases or malignant transformations, as it carries a risk of secondary post-radiation sarcoma. * **B. Excision:** Simple excision often fails to account for the infiltrative nature of the tumor, leading to a high rate of local recurrence. * **C. Enucleation:** This involves "shelling out" the tumor. While it may be used for unicystic variants, for the more common multicystic (solid) ameloblastoma, enucleation is contraindicated as it almost guarantees recurrence (up to 50–90%). **Clinical Pearls for NEET-PG:** * **Most common site:** Posterior mandible (angle and ramus). * **Radiological appearance:** Classic **"Soap-bubble"** or "Honey-comb" appearance. * **Histopathology:** Features "Stellate reticulum" and "Palisading ameloblasts" (Vickers-Gorlin criteria). * **Treatment of Choice:** Wide local excision with at least 1–1.5 cm healthy bone margins is the gold standard for multicystic types.

Question 128: Marjolin's ulcer is a:

A. Malignant ulcer found on the scar of a burn (Correct Answer)
B. Malignant ulcer found on an infected foot
C. Trophic ulcer
D. Meleney's gangrene

Explanation: **Explanation:** **Marjolin’s ulcer** refers to a squamous cell carcinoma (SCC) that arises in areas of chronic inflammation, long-standing scars, or non-healing wounds. The most classic and high-yield association is with **post-burn scars** (cicatrix). 1. **Why Option A is correct:** Chronic irritation and poor lymphatic drainage in a dense burn scar lead to repeated tissue breakdown and repair. Over a long latent period (average 25–30 years), this cellular stress triggers malignant transformation, typically into a well-differentiated squamous cell carcinoma. 2. **Why other options are incorrect:** * **Option B:** While SCC can occur in chronic osteomyelitis sinuses or diabetic foot ulcers, the specific eponym "Marjolin’s" is most strictly tied to scar-based malignancy. * **Option C:** A **Trophic ulcer** (Punched-out ulcer) is a neurotrophic ulcer caused by pressure in a denervated area (e.g., Leprosy or Diabetes), not a malignancy. * **Option D:** **Meleney’s gangrene** is a synergistic bacterial gangrene of the abdominal wall, usually following surgery; it is an infective process, not neoplastic. **Clinical Pearls for NEET-PG:** * **Most common histological type:** Squamous Cell Carcinoma (SCC). * **Characteristics:** It is typically **painless** (as the scar lacks sensory nerves), has everted edges, and is **slow to metastasize** because the dense scar tissue limits lymphatic spread. However, once it spreads, the prognosis is poor. * **Management:** Wide local excision (2 cm margin) is the treatment of choice. * **Latent Period:** Can be "Acute" (within 1 year) or "Chronic" (most common).

Question 129: Which of the following has an increased risk?

A. Squamous cell carcinoma (Correct Answer)
B. Basal cell carcinoma
C. Melanoma
D. Liposarcoma

Explanation: ***Squamous cell carcinoma*** - **Marjolin's ulcer** develops from chronic wounds, burn scars, or chronic inflammatory conditions, with **squamous cell carcinoma** being the most common malignant transformation. - The **chronic inflammation** and repetitive tissue damage create an environment that promotes **malignant transformation** of squamous epithelial cells, typically after a latency period of **10-20 years**. *Basal cell carcinoma* - **BCC** typically arises from **sun-exposed skin** in fair-skinned individuals and is not associated with chronic wounds or burn scars. - **Chronic ulcers** and **inflammatory conditions** do not predispose to basal cell carcinoma development. *Melanoma* - **Melanoma** arises from **melanocytes** and is primarily associated with **UV exposure**, **atypical moles**, and **genetic factors**. - **Chronic wounds** and **burn scars** do not increase the risk of melanoma as they lack the melanocytic component necessary for this malignancy. *Liposarcoma* - **Liposarcoma** is a **soft tissue sarcoma** arising from **adipose tissue** and is not related to chronic wounds or epithelial damage. - **Marjolin's ulcer** specifically involves **epithelial malignant transformation**, not mesenchymal tissue sarcomas like liposarcoma.

Question 130: Which of the following is an example of a clean-contaminated wound?

A. Cholecystectomy (Correct Answer)
B. Appendicular perforation
C. Inguinal hernia surgery
D. Mastectomy

Explanation: ### Explanation The classification of surgical wounds is a high-yield topic for NEET-PG, based on the **CDC Surgical Wound Classification** which predicts the risk of surgical site infection (SSI). **1. Why Cholecystectomy is Correct:** A **Clean-Contaminated (Class II)** wound is defined as a surgical incision where a hollow viscus (respiratory, alimentary, genital, or urinary tract) is entered under **controlled conditions** without unusual contamination. In an elective cholecystectomy, the biliary tract (part of the alimentary system) is entered. Since there is no evidence of active infection or major break in technique, it fits this category. **2. Analysis of Incorrect Options:** * **Appendicular Perforation (Class IV - Dirty/Infected):** This involves a pre-existing clinical infection or perforated viscera with pus or fecal matter. It carries the highest risk of SSI. * **Inguinal Hernia Surgery (Class I - Clean):** This is an elective procedure where no hollow viscus is entered, and there is no inflammation. The respiratory, alimentary, and genitourinary tracts are not breached. * **Mastectomy (Class I - Clean):** Similar to hernia repair, this involves skin and underlying tissue without entering a contaminated tract. **3. Clinical Pearls for NEET-PG:** * **Clean (Class I):** No inflammation; no tract entered. SSI risk: <2%. * **Clean-Contaminated (Class II):** Tract entered under controlled conditions. SSI risk: <10%. * **Contaminated (Class III):** Accidental open wounds, gross spillage from GI tract, or acute non-purulent inflammation (e.g., simple acute appendicitis). SSI risk: 15-20%. * **Dirty (Class IV):** Perforation, abscess, or old traumatic wounds with retained devitalized tissue. SSI risk: Up to 40%.

Practice by Chapter

Wound Healing and Care

Practice Questions

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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