General Surgery Principles Practice Questions

Q: What is the most common malignancy found in Marjolin's ulcer?

Squamous cell carcinoma (SCC). **Explanation:** A **Marjolin’s ulcer** refers to a malignancy arising in a site of chronic inflammation, long-standing scars, or non-healing wounds. The most common underlying cause is a **chronic burn scar** (cicatrix), though it can also occur in chronic osteomyelitis sinuses, venous stasis ulcers, and vaccination scars. **1. Why Squamous Cell Carcinoma (SCC) is correct:** The vast majority (approximately **75–90%**) of malignancies arising in Marjolin’s ulcers are **Squamous Cell Carcinomas**. The chronic irritation and repeated cycles of tissue damage and repair lead to cellular dysplasia and eventual malignant transformation into SCC. Notably, Marjolin’s SCC is typically more aggressive and has a higher rate of lymph node metastasis compared to SCC arising from sun-damaged skin. **2. Why other options are incorrect:** * **Basal Cell Carcinoma (BCC):** While BCC is the most common skin cancer overall, it is the second most common malignancy in Marjolin’s ulcers (approx. 10%). It is less frequent than SCC in this specific clinical context. * **Malignant Melanoma & Fibrous Histiocytoma:** These are extremely rare occurrences in chronic scars and do not represent the standard presentation of a Marjolin’s ulcer. **High-Yield Clinical Pearls for NEET-PG:** * **Latency Period:** The average time for malignant transformation is **30–35 years**. * **Characteristic Feature:** A Marjolin’s ulcer typically lacks the "everted edges" seen in standard SCC; instead, it presents as a persistent ulcer with indurated borders. * **Diagnosis:** Biopsy must be taken from the **edge/margin** of the ulcer. * **Treatment:** Wide local excision (usually with a 2 cm margin) or amputation, depending on the site and depth of invasion.

Q: All are early features of generalized peritonitis except?

Hippocratic facies. **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.

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

1st Webspace. **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.

Q: 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?

The scar tissue in which it occurs lacks lymphatic vessels.. **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.

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

Alveolar osteitis. **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).

Q: Massive transfusion can cause hemorrhage in a previously healthy adult due to which of the following?

Dilutional thrombocytopenia. Massive transfusion is defined as the replacement of one total blood volume (approx. 10 units of PRBCs) within 24 hours. The most common cause of coagulopathy and subsequent hemorrhage in this clinical scenario is Dilutional Thrombocytopenia. **1. Why Dilutional Thrombocytopenia is correct:** Stored Packed Red Blood Cells (PRBCs) are deficient in viable platelets and clotting factors (specifically Factors V and VIII) [2]. When a patient receives large volumes of PRBCs and crystalloids without proportional replacement of platelets, the patient’s endogenous platelet count is "diluted." Once the count falls below critical levels, it leads to microvascular bleeding and hemorrhagic complications. **2. Why the other options are incorrect:** * **Vitamin K deficiency:** While Vitamin K is essential for factors II, VII, IX, and X, its deficiency usually occurs due to malabsorption, chronic liver disease, or prolonged antibiotic use. It is not an acute consequence of massive transfusion. * **Increased tPA:** Tissue Plasminogen Activator (tPA) levels rise in primary fibrinolysis. While massive trauma can trigger fibrinolysis, it is not the primary mechanism associated with the transfusion process itself. * **Increased Hemoglobin:** Massive transfusion aims to restore hemoglobin; however, high hemoglobin levels would increase viscosity, not cause hemorrhage. **Clinical Pearls for NEET-PG:** * **Lethal Triad of Trauma:** Coagulopathy, Acidosis, and Hypothermia. * **Electrolyte Imbalance:** Massive transfusion often leads to **Hypocalcemia** (due to citrate toxicity) and **Hyperkalemia** (due to RBC lysis in stored blood). * **Management:** To prevent dilutional coagulopathy, modern protocols suggest a **1:1:1 ratio** (PRBC: FFP: Platelets) [1].

Q: Which type of hernia is most prone to reoccur after primary repair?

Incisional. **Explanation:** **Incisional hernias** have the highest recurrence rates among all abdominal wall hernias, often cited between **10–50%** depending on the repair technique (primary suture vs. mesh). The underlying medical concept is that an incisional hernia occurs through a pre-existing surgical scar, which represents a zone of permanent structural weakness. Unlike primary hernias, the surrounding fascia is often attenuated, poorly vascularized, and has altered collagen metabolism, making primary suture repair prone to "cheese-wiring" and subsequent failure. **Analysis of Incorrect Options:** * **Femoral Hernia:** While these have the highest risk of **strangulation** due to the rigid boundaries of the femoral canal, their recurrence rate after proper repair (e.g., McVay’s or mesh plug) is significantly lower than incisional hernias. * **Epigastric Hernia:** These occur through small defects in the linea alba. While they have a moderate recurrence rate if multiple small defects are missed, they generally heal well because they occur in "virgin" tissue. * **Spigelian Hernia:** These are rare interstitial hernias occurring through the Spigelian aponeurosis. Because the surrounding fascia is usually healthy and the defect is small, recurrence after surgical repair is uncommon. **Clinical Pearls for NEET-PG:** * **Gold Standard Repair:** For incisional hernias, **mesh repair** (Laparoscopic or Open) is mandatory for defects >2 cm to reduce recurrence. * **Most Common Site:** The most common site for an incisional hernia is a **midline vertical incision**. * **Risk Factors:** Obesity, wound infection (the single most important factor), and smoking significantly increase recurrence risk. * **Richter’s Hernia:** Frequently involves the femoral ring; only a portion of the bowel wall is entrapped.

Q: What is the recommended timing for pneumococcal vaccination prior to splenectomy?

2 weeks. **Explanation:** The primary concern following a splenectomy is **Overwhelming Post-Splenectomy Infection (OPSI)**, most commonly caused by encapsulated organisms like *Streptococcus pneumoniae*. To prevent this, immunization is mandatory. **1. Why 2 weeks is the correct answer:** The goal of preoperative vaccination is to allow the body sufficient time to mount an adequate humoral immune response (antibody production) before the lymphoid tissue of the spleen is removed. Studies show that a minimum of **14 days (2 weeks)** is required to achieve peak antibody titers. If the surgery is elective, the vaccines should be administered at least 2 weeks prior. If the splenectomy is emergent (e.g., trauma), the vaccines should be given **2 weeks after** the procedure to avoid the period of post-traumatic immunosuppression. **2. Why other options are incorrect:** * **1 week / 3 days:** These durations are insufficient for the B-cells in the splenic follicles to undergo clonal expansion and produce protective levels of IgG antibodies. * **1 month:** While waiting longer is not harmful, 2 weeks is the established clinical standard that balances surgical scheduling with immunological efficacy. **Clinical Pearls for NEET-PG:** * **Target Organisms:** The "Big Three" vaccines required are against *S. pneumoniae*, *Haemophilus influenzae* type b (Hib), and *Neisseria meningitidis*. * **Annual Requirement:** Patients should also receive the annual Influenza vaccine. * **Re-vaccination:** Pneumococcal boosters are typically recommended every 5 years. * **Prophylaxis:** In addition to vaccines, lifelong prophylactic antibiotics (usually Penicillin V) are often recommended, especially in children.

Q: Which of the following hormones increases during surgical stress?

Cortisol. ### Explanation **Correct Option: A (Cortisol)** Surgical stress triggers the **Neuroendocrine Stress Response**, characterized by the activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis and the Sympathetic Nervous System. The hypothalamus releases Corticotropin-Releasing Hormone (CRH), which stimulates the anterior pituitary to secrete ACTH, leading to a significant rise in **Cortisol** from the adrenal cortex. Cortisol acts as a "stress hormone" to maintain hemodynamic stability, increase blood glucose (via gluconeogenesis), and modulate the inflammatory response during trauma or surgery. **Analysis of Incorrect Options:** * **B. Glucagon:** While glucagon levels do rise during stress to assist in hyperglycemia, **Cortisol** is the primary and most characteristic hormonal marker of the surgical endocrine response cited in standard physiological texts for this context. * **C. Insulin:** Insulin levels typically **decrease** or remain inappropriately low relative to blood glucose levels during the initial "ebb phase" of surgical stress. Furthermore, stress induces peripheral **insulin resistance**, leading to "stress-induced hyperglycemia." * **D. Gastrin:** Gastrin is primarily involved in gastrointestinal regulation (acid secretion) and is not a component of the systemic neuroendocrine stress response. **High-Yield Clinical Pearls for NEET-PG:** * **Hormones that INCREASE in stress:** Cortisol, Catecholamines (Epinephrine/Norepinephrine), Glucagon, Growth Hormone, ADH (Vasopressin), and Renin-Angiotensin-Aldosterone. * **Hormones that DECREASE in stress:** Insulin, Testosterone, and Estrogen. * **The "Ebb Phase":** Occurs immediately after injury (24–48 hours); characterized by decreased metabolic rate, decreased body temperature, and increased catecholamines/cortisol. * **The "Flow Phase":** Follows the ebb phase; characterized by hypermetabolism, catabolism, and persistent elevation of stress hormones.

Question 1

What is the most common malignancy found in Marjolin's ulcer?

Accepted Answer

Squamous cell carcinoma (SCC)

Answer

Basal cell carcinoma (BCC)

Answer

Malignant fibrous histiocytoma

Answer

Malignant melanoma

Question 2

All are early features of generalized peritonitis except?

Accepted Answer

Hippocratic facies

Answer

Abdominal tenderness

Answer

Infrequent bowel sounds

Answer

Tachycardia

Question 3

Infection of the thenar space is drained by incision at?

Accepted Answer

1st Webspace

Answer

2nd Webspace

Answer

Just above flexor retinaculum

Answer

3rd Webspace

Question 4

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?

Accepted Answer

The scar tissue in which it occurs lacks lymphatic vessels.

Answer

The cells have a lower malignant potential.

Answer

It is more rapidly diagnosed compared to a typical squamous cell carcinoma.

Answer

None of the above.

Question 5

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

Accepted Answer

Alveolar osteitis

Answer

Myonecrosis

Answer

Osteoradionecrosis

Answer

Chronic osteomyelitis

Question 6

Massive transfusion can cause hemorrhage in a previously healthy adult due to which of the following?

Accepted Answer

Dilutional thrombocytopenia

Answer

Vitamin K deficiency

Answer

Increased tPA

Answer

Increased hemoglobin

Question 7

Which type of hernia is most prone to reoccur after primary repair?

Accepted Answer

Incisional

Answer

Femoral

Answer

Epigastric

Answer

Spigelian

Question 8

Which of the following statements is true regarding intravenous administration of chemotherapy?

Accepted Answer

Problems of wound healing should be anticipated if systemic 5-FU therapy is begun less than 2 weeks postoperatively.

Answer

Subcutaneous extravasation of carmustine (BCNU) or 5-fluorouracil (5-FU) usually causes ulceration.

Answer

Extravasation of doxorubicin rarely causes serious ulceration because the agent binds quickly to tissue nucleic acid.

Answer

Serious and progressive ulceration can be expected following extravasation of vincristine or vinblastine.

Question 9

What is the recommended timing for pneumococcal vaccination prior to splenectomy?

Accepted Answer

2 weeks

Answer

1 week

Answer

3 days

Answer

1 month

Question 10

Which of the following hormones increases during surgical stress?

Accepted Answer

Cortisol

Answer

Glucagon

Answer

Insulin

Answer

Gastrin

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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