General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 81: During surgery of a strangulated inguinal hernia, at which part of the sac should it be opened?

A. Neck
B. Fundus (Correct Answer)
C. Body
D. Deep ring

Explanation: **Explanation:** In the surgical management of a strangulated inguinal hernia, the primary concern is the viability of the trapped contents (usually omentum or bowel) and the presence of toxic fluid within the sac. **Why the Fundus is the correct site:** The **fundus** (the distal-most part of the sac) is the safest place to open for two main reasons: 1. **Avoidance of Injury:** In a strangulated hernia, the contents are often distended and under pressure. Opening at the fundus provides the furthest distance from the narrow neck, minimizing the risk of accidentally injuring the bowel or omentum. 2. **Fluid Management:** Strangulation leads to the accumulation of "hernia fluid," which is often serosanguinous and laden with bacteria or toxins. Opening at the fundus allows for the controlled aspiration and inspection of this fluid before it can drain back into the peritoneal cavity. **Why other options are incorrect:** * **Neck (Option A) & Deep Ring (Option D):** The neck is the site of constriction. Opening here is dangerous because the bowel is tightly packed and under maximum tension, making accidental enterotomy highly likely. Furthermore, if the neck is divided first, the gangrenous/infected contents may slip back into the abdomen before they can be inspected for viability. * **Body (Option C):** While safer than the neck, the body still carries a higher risk of underlying adhesions compared to the fundus. **Clinical Pearls for NEET-PG:** * **Order of Action:** Always open the sac at the fundus, secure the contents to prevent them from slipping back, and *then* release the constriction at the neck. * **Viability Assessment:** After releasing the constriction, observe the bowel for 10–15 minutes with warm saline packs. Signs of viability include the return of pink color, visible peristalsis, and pulsation of mesenteric vessels. * **Maydl’s Hernia:** A "W-shaped" hernia where the loop inside the sac is healthy, but the intervening loop inside the abdomen is gangrenous. Always pull out more bowel to check the "hidden" loop.

Question 82: What is true about lymphangioma?

A. Common in the pubic region
B. Responds to low doses of radiotherapy
C. Progresses slowly and may invade local tissue (Correct Answer)
D. Predisposes to cancers

Explanation: **Explanation:** Lymphangiomas are benign congenital malformations of the lymphatic system, resulting from the failure of lymphatics to connect with the venous system. **Why Option C is Correct:** Lymphangiomas are characterized by a **slow, progressive growth** pattern. While they are histologically benign (non-cancerous), they are clinically "locally invasive." They tend to infiltrate tissue planes, surrounding vital structures like nerves and blood vessels, which often makes complete surgical excision challenging. **Analysis of Incorrect Options:** * **Option A:** They are most common in the **neck (Cystic Hygroma)**, occurring in the posterior triangle (75% of cases), followed by the axilla. The pubic region is an uncommon site. * **Option B:** Lymphangiomas are **radio-resistant**. Radiotherapy is not a recommended treatment and may actually lead to complications like skin damage or secondary malignancies. * **Option D:** These are benign malformations and **do not have a recognized premalignant potential**. They do not predispose to carcinomas or sarcomas. **NEET-PG High-Yield Pearls:** * **Clinical Sign:** They are classically **brilliantly transilluminant** (especially the cystic variety). * **Classification:** Divided into Simple (capillary), Cavernous, and Cystic (Cystic Hygroma). * **Treatment of Choice:** Surgical excision is preferred, but for unresectable cases, **Sclerosants** (e.g., OK-432/Picibanil, Bleomycin, or Doxycycline) are used to shrink the lesion. * **Complications:** Sudden increase in size usually indicates secondary infection or intralesional hemorrhage.

Question 83: At surgery for a right inguinal hernia, a 72-year-old man is found to have a hernia sac that is not independent of the bowel wall. The cecum forms part of the wall of the sac. Such a hernia is properly referred to as which of the following?

A. Incarcerated
B. Irreducible
C. Sliding (Correct Answer)
D. Richter's

Explanation: **Explanation:** The correct answer is **Sliding Hernia**. A sliding hernia (hernia en glissade) occurs when a retroperitoneal organ (most commonly the **cecum** on the right or the **sigmoid colon** on the left) drags its overlying peritoneum with it into the inguinal canal. Consequently, the organ itself forms part of the posterior or lateral wall of the hernia sac, rather than being entirely contained within it. This is a crucial surgical distinction because any attempt to ligate the sac at the internal ring (high ligation) without recognizing the "sliding" component can lead to accidental injury to the bowel or its blood supply. **Analysis of Incorrect Options:** * **Incarcerated:** This refers to a hernia where the contents are trapped and cannot be reduced into the abdominal cavity. While a sliding hernia can be incarcerated, the term specifically describes the *state* of the contents, not the *anatomical composition* of the sac wall. * **Irreducible:** This is a clinical term synonymous with incarceration. It indicates that the hernia contents cannot be manually pushed back. * **Richter’s Hernia:** This occurs when only a portion of the circumference of the bowel wall (usually the antimesenteric border) is trapped within the hernia sac. It is dangerous because strangulation can occur without causing complete intestinal obstruction. **NEET-PG High-Yield Pearls:** * **Most common organ involved:** Bladder (especially in direct hernias) or Sigmoid colon (left side) and Cecum (right side). * **Clinical Clue:** Suspect a sliding hernia in elderly males with large, long-standing globular inguinal hernias. * **Surgical Management:** High ligation of the sac is contraindicated. The sac is partially excised, and the "sliding" organ is replaced into the extraperitoneal space (Bevan’s technique).

Question 84: Which surgical repair is appropriate for a patient with a femoral hernia?

A. Bassini repair
B. Hunter's repair
C. Shouldice repair
D. McVay repair (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. McVay repair**. **Why McVay repair is correct:** A femoral hernia occurs when abdominal contents protrude through the femoral canal, which is located medial to the femoral vein and inferior to the inguinal ligament. The **McVay (Cooper’s ligament) repair** is the classic tissue-based procedure for femoral hernias. In this technique, the conjoined tendon is sutured to **Cooper’s ligament** (pectineal ligament) rather than the inguinal ligament. This effectively bridges the gap and obliterates the femoral canal, addressing the anatomical defect responsible for the hernia. **Why the other options are incorrect:** * **A. Bassini repair:** This is a classic inguinal hernia repair where the conjoined tendon is sutured to the **inguinal ligament**. It does not close the femoral canal and is therefore ineffective for femoral hernias. * **B. Hunter’s repair:** This is not a recognized standard surgical repair for hernias. (Note: John Hunter is famous for Hunter’s canal/adductor canal, but not a hernia repair). * **C. Shouldice repair:** This is a multi-layer imbrication of the posterior wall of the inguinal canal. While it is the "gold standard" for tissue-based **inguinal** hernia repair, it does not address the femoral space. **High-Yield Clinical Pearls for NEET-PG:** * **Anatomy:** The femoral canal is bounded medially by the **lacunar ligament** and laterally by the **femoral vein**. * **Epidemiology:** Femoral hernias are more common in **females** (due to a wider pelvis), but inguinal hernias remain the most common hernia overall in both sexes. * **Risk:** Femoral hernias have the **highest risk of strangulation** (approx. 40%) due to the rigid boundaries of the femoral ring. * **Modern Approach:** While McVay is the classic answer, modern practice often utilizes **Laparoscopic (TEP/TAPP)** mesh repairs or the **Plug and Patch** technique.

Question 85: All are early features of generalized peritonitis except?

A. Abdominal tenderness
B. Infrequent bowel sounds
C. Tachycardia
D. Hippocratic facies (Correct Answer)

Explanation: **Explanation:** Generalized peritonitis is an acute inflammatory process of the peritoneum. To answer this question, one must distinguish between the **early inflammatory phase** and the **late septic/terminal phase**. **Why Hippocratic Facies is the Correct Answer:** **Hippocratic facies** is a **late/terminal feature** of generalized peritonitis. It describes a specific facial appearance—sunken eyes, hollow cheeks, pinched nose, and dry crusty lips—resulting from severe dehydration, electrolyte imbalance, and advanced sepsis. By the time this appears, the patient is usually in a state of irreversible circulatory collapse. **Analysis of Incorrect Options (Early Features):** * **Abdominal Tenderness:** This is the **earliest and most reliable sign** of peritoneal irritation. It is initially localized but becomes generalized as the underlying pathology (e.g., perforated peptic ulcer) spreads. * **Infrequent Bowel Sounds:** As the peritoneum becomes inflamed, the enteric nervous system is inhibited, leading to **adynamic ileus**. This manifests early as hypoactive or absent bowel sounds. * **Tachycardia:** An early systemic response to pain, fluid shifting (third-spacing), and the initial inflammatory cascade. **NEET-PG High-Yield Pearls:** * **Most common cause of peritonitis:** Perforation of a hollow viscus (most commonly a peptic ulcer in India). * **Rigidity:** A state of constant muscular spasm; "Board-like rigidity" is a classic sign of perforated viscus. * **Rebound Tenderness (Blumberg Sign):** Indicates parietal peritoneal irritation. * **X-ray Finding:** Pneumoperitoneum (gas under the diaphragm) is seen in ~70% of cases of perforated viscus. * **Management Priority:** Aggressive fluid resuscitation and correction of electrolytes precede surgical intervention.

Question 86: Infection of the thenar space is drained by incision at?

A. 1st Webspace (Correct Answer)
B. 2nd Webspace
C. Just above flexor retinaculum
D. 3rd Webspace

Explanation: **Explanation:** The **thenar space** is a deep fascial compartment of the palm, located posterior to the long flexor tendons of the index finger and anterior to the adductor pollicis muscle. It is separated from the midpalmar space by a fibrous septum attached to the 3rd metacarpal bone. **Why Option A is correct:** Infection of the thenar space (thenar space abscess) typically presents with marked swelling of the thumb web and the radial side of the palm, forcing the thumb into an abducted position. The surgical drainage is performed via an **incision in the 1st webspace** (dorsal or volar approach). This provides the most direct access to the space while avoiding injury to the recurrent branch of the median nerve (which supplies the thenar muscles) and the flexor tendons. **Why the other options are incorrect:** * **Option B & D (2nd and 3rd Webspaces):** These are used to drain **web space infections** (collar-stud abscesses) or provide access to the **midpalmar space**. The midpalmar space is typically drained via an incision in the 3rd or 4th webspace. * **Option C (Above flexor retinaculum):** This area is associated with the **carpal tunnel** or the proximal extensions of the radial and ulnar bursae (Parona’s space). It is not the anatomical site for draining the thenar space. **Clinical Pearls for NEET-PG:** * **Kanavel’s Signs:** These are diagnostic for **Flexor Tenosynovitis**, not space infections. * **Midpalmar Space Drainage:** Usually drained through an incision in the 3rd or 4th webspace or a transverse palmar incision. * **Parona’s Space:** A deep space in the distal forearm where infections from the radial or ulnar bursae can track; it is drained by a proximal forearm incision. * **Horse-shoe Abscess:** Occurs when infection spreads between the radial bursa (thumb) and ulnar bursa (little finger) via Parona's space.

Question 87: What is the treatment for a patient who developed TMJ ankylosis at age 5 following trauma, presenting at age 8?

A. Gap arthroplasty
B. Gap arthroplasty with temporalis muscle meniscus placed in the joint space (Correct Answer)
C. Condylectomy
D. Condyloplasty

Explanation: **Explanation:** Temporomandibular Joint (TMJ) ankylosis in children is a debilitating condition that leads to restricted mouth opening, facial asymmetry, and secondary growth retardation of the mandible. **Why Option B is Correct:** The standard surgical management for TMJ ankylosis is **Gap Arthroplasty**. However, simple gap arthroplasty (Option A) has a high rate of **recurrence** due to re-fusion of the bone ends. To prevent this, an **interpositional material** must be placed in the newly created joint space. The **temporalis muscle fascia/meniscus** is the preferred autogenous graft because it is locally available, has a good blood supply, and acts as a biological barrier that prevents heterotopic bone formation and ensures long-term joint mobility. **Why Other Options are Incorrect:** * **Option A (Gap Arthroplasty):** While this is the initial step of the procedure, performing it without an interpositional graft leads to a high risk of "re-ankylosis," especially in pediatric patients who have high osteogenic potential. * **Option C & D (Condylectomy/Condyloplasty):** These involve removing or reshaping the condyle. In cases of true ankylosis, the anatomy is often distorted into a large bony mass; simple excision is insufficient to restore function and prevent recurrence compared to formal gap arthroplasty with interposition. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause** of TMJ ankylosis in children is **trauma** (specifically undiagnosed condylar fractures), followed by infection (Otitis media). * **Bird-face deformity:** Seen in bilateral TMJ ankylosis due to micrognathia (failure of the mandibular growth center). * **Treatment Sequence:** 1. Release of ankylosis (Gap arthroplasty) → 2. Interpositional grafting → 3. Early aggressive postoperative physiotherapy (crucial for success). * **Costochondral graft:** Often used in children after the gap arthroplasty to replace the growth center and restore mandibular height.

Question 88: The Gompertzian curve is used to describe which of the following?

A. Cancer growth (Correct Answer)
B. Wound healing rate
C. Haemorrhagic shock
D. Nutritional requirements in surgical patients

Explanation: **Explanation:** The **Gompertzian model** is a mathematical curve used to describe the growth kinetics of solid tumors. Unlike a simple exponential model, Gompertzian growth is **non-linear**. It suggests that early in the disease, tumor growth is rapid (exponential). However, as the tumor mass increases, the growth rate slows down due to limitations in nutrient supply, oxygen availability, and space (a phenomenon known as "growth fraction" reduction). This results in a sigmoid (S-shaped) curve. * **Why Option A is correct:** In clinical oncology, this curve explains why small micrometastases grow faster than large primary tumors. It is the basis for **adjuvant chemotherapy**, as smaller tumors have a higher growth fraction and are more susceptible to cell-cycle-specific drugs. * **Why Options B, C, and D are incorrect:** * **Wound healing (B):** Follows a predictable biological sequence (hemostasis, inflammation, proliferation, remodeling) but is not described by the Gompertzian curve. * **Haemorrhagic shock (C):** Usually categorized by the **ATLS Classification (Classes I-IV)** based on blood loss and physiological parameters. * **Nutritional requirements (D):** Calculated using the **Harris-Benedict equation** or indirect calorimetry. **High-Yield Clinical Pearls for NEET-PG:** 1. **Skipper’s Law:** States that a specific dose of chemotherapy kills a constant *fraction* of cells, not a constant *number* (Log-kill hypothesis). 2. **Doubling Time:** The time taken for a tumor to double in volume. For most solid tumors, this is roughly 2-3 months. 3. **Clinical Detection:** A tumor is usually clinically detectable when it reaches **1 cm in diameter** (approx. $10^9$ cells or 30 doublings). Death typically occurs at $10^{12}$ cells.

Question 89: A patient presents with a Marjolin's ulcer. Although a Marjolin's ulcer is a squamous cell carcinoma, it characteristically does not readily spread through the lymph nodes. Which is the TRUE attributed reason for this phenomenon?

A. The cells have a lower malignant potential.
B. It is more rapidly diagnosed compared to a typical squamous cell carcinoma.
C. The scar tissue in which it occurs lacks lymphatic vessels. (Correct Answer)
D. None of the above.

Explanation: **Explanation:** **1. Why Option C is correct:** A Marjolin’s ulcer is a squamous cell carcinoma (SCC) that arises in areas of chronic irritation, most commonly in **long-standing burn scars (cicatrix)**, chronic osteomyelitis sinuses, or venous ulcers. The hallmark of this condition is its occurrence within dense, avascular, and fibrotic scar tissue. This **scar tissue lacks a functional lymphatic network**. Consequently, even though the tumor may be histologically aggressive, the malignant cells cannot easily access lymphatic channels to metastasize to regional lymph nodes. This anatomical barrier is the primary reason for the delayed lymphatic spread. **2. Why other options are incorrect:** * **Option A:** This is incorrect because Marjolin’s ulcers are actually **more aggressive** and have a higher metastatic potential once they break through the scar tissue compared to typical solar-induced SCC. * **Option B:** This is incorrect because Marjolin’s ulcers are often **diagnosed late**. The malignancy develops slowly (average latency of 30+ years), and changes are frequently masked by the pre-existing chronic wound or scar. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most Common Site:** Lower limbs (specifically around the knee and ankle). * **Latency Period:** Usually very long (average 25–35 years). * **Biopsy:** Always perform an edge biopsy (wedge biopsy) from multiple sites to rule out malignancy in non-healing ulcers. * **Prognosis:** Once the tumor invades beyond the scar tissue into normal tissue, it spreads rapidly via lymphatics and carries a poorer prognosis than standard SCC. * **Treatment:** Wide local excision (2-3 cm margin) is the gold standard; lymph node dissection is indicated only if nodes are clinically palpable.

Question 90: Hyperbaric oxygen therapy is used for the treatment of all the following conditions except:

A. Myonecrosis
B. Osteoradionecrosis
C. Alveolar osteitis (Correct Answer)
D. Chronic osteomyelitis

Explanation: **Explanation:** Hyperbaric Oxygen Therapy (HBOT) involves breathing 100% oxygen at pressures greater than 1 atmosphere absolute (ATA). It works by increasing the amount of dissolved oxygen in the plasma (Henry’s Law), which promotes angiogenesis, enhances leucocyte bacterial killing, and inhibits anaerobic toxin production. **Why Alveolar Osteitis is the Correct Answer:** Alveolar osteitis, commonly known as **"Dry Socket,"** is a localized inflammatory condition that occurs after tooth extraction when the blood clot fails to form or is dislodged. It is primarily managed with local measures (irrigation and medicated dressings) and analgesics. HBOT has no established role in its pathophysiology or clinical management. **Analysis of Incorrect Options:** * **Myonecrosis (Gas Gangrene):** Caused by *Clostridium perfringens*. HBOT is life-saving here as it stops the production of alpha-toxin by anaerobic bacteria and creates an environment lethal to obligate anaerobes. * **Osteoradionecrosis (ORN):** Radiation causes "3H" tissue (Hypocellular, Hypovascular, Hypoxic). HBOT is a standard treatment to stimulate fibroangiogenesis in irradiated bone before and after surgical debridement. * **Chronic Osteomyelitis:** In refractory cases, HBOT enhances the oxidative killing mechanism of neutrophils and works synergistically with antibiotics (like aminoglycosides) to penetrate infected bone. **High-Yield Clinical Pearls for NEET-PG:** * **Absolute Contraindication:** Untreated Tension Pneumothorax. * **Common Side Effect:** Middle ear barotrauma (most common) and reversible myopia. * **Other Indications:** Carbon monoxide poisoning, Decompression sickness (Bends), Air/Gas embolism, and Diabetic foot ulcers (Wagner Grade 3 or higher). * **Mechanism:** It increases dissolved oxygen in arterial blood to approximately 6 vol% (sufficient to support life without hemoglobin).

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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