General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 441: Which of the following conditions is NOT associated with pancreatic panniculitis?

A. Pancreas cancer
B. Chronic pancreatitis
C. Acute pancreatitis
D. Pancreatic mucinous cyst (Correct Answer)

Explanation: ### Explanation **Pancreatic panniculitis** (also known as enzymatic fat necrosis) is a rare skin manifestation occurring in approximately 2–3% of patients with pancreatic disease. It is characterized by painful, erythematous nodules, typically on the lower extremities, which may ulcerate and discharge an oily substance. **Why Option D is correct:** Pancreatic mucinous cysts (such as Mucinous Cystadenomas) are typically localized, slow-growing neoplastic lesions. They generally do not cause a massive systemic release of pancreatic enzymes into the circulation. Pancreatic panniculitis requires **high levels of circulating amylase and lipase**, which hydrolyze subcutaneous fat, leading to "ghost cells" (anucleated adipocytes with shadowy cell walls) on histology. **Why the other options are incorrect:** * **Acute and Chronic Pancreatitis (Options B & C):** These are the most common causes. Inflammation leads to the leakage of acinar enzymes into the portal and systemic circulation, triggering distal fat necrosis. * **Pancreatic Cancer (Option A):** Specifically, **Acinar Cell Carcinoma** is strongly associated with pancreatic panniculitis (Schmid’s triad: panniculitis, polyarthritis, and eosinophilia). The tumor cells actively secrete lipase, leading to widespread fat necrosis. ### High-Yield Clinical Pearls for NEET-PG: * **Histology Keyword:** Look for **"Ghost Cells"** (pathognomonic)—adipocytes that have lost their nuclei but retain their cellular outlines due to saponification. * **Schmid’s Triad:** Pancreatic panniculitis + Polyarthritis + Eosinophilia (associated with a poor prognosis in pancreatic malignancy). * **Clinical Presentation:** Often precedes the diagnosis of the underlying pancreatic pathology by several weeks. * **Distribution:** Most common on the shins, mimicking Erythema Nodosum, but distinguished by the "oily" discharge.

Question 442: Cold abscess in the chest wall is most commonly due to which of the following?

A. Tuberculosis of the spine (Correct Answer)
B. Tuberculosis of the rib
C. Tuberculosis of the pelvis
D. Tuberculosis of the pleura

Explanation: **Explanation:** A **cold abscess** is a collection of pus without the classic signs of inflammation (heat, redness, or pain), typically caused by *Mycobacterium tuberculosis*. **1. Why Tuberculosis of the spine is correct:** The most common cause of a cold abscess in the chest wall is **Tuberculosis of the spine (Pott’s spine)**. The infection originates in the vertebral bodies and tracks along the tissue planes. Specifically, pus from the thoracic vertebrae follows the course of the **intercostal nerves and vessels**. It travels laterally and anteriorly between the ribs, eventually pointing towards the skin on the chest wall, often at the site where the lateral cutaneous branch of the intercostal nerve emerges. **2. Why the other options are incorrect:** * **TB of the rib:** While TB can affect the ribs directly, it is a much rarer primary source for a chest wall abscess compared to the spine. * **TB of the pelvis:** Pus from the lumbar spine or pelvis typically tracks downward along the psoas muscle (Psoas abscess) to point in the groin or thigh, not the chest wall. * **TB of the pleura:** Pleural tuberculosis usually results in pleural effusion or empyema thoracis. While an *empyema necessitans* can burrow through the chest wall, it is clinically distinct and less common than a spinal cold abscess. **Clinical Pearls for NEET-PG:** * **Commonest site:** The most common site for a cold abscess on the chest wall is the **lateral or anterior aspect**, where the intercostal nerves pierce the fascia. * **Fluctuation Test:** A cold abscess is often "fluctuant" but lacks overlying warmth. * **Management:** Never perform simple Incision and Drainage (I&D) as it leads to a persistent sinus. The preferred method is **aspiration through healthy skin** (Z-track technique) combined with Antitubercular Therapy (ATT).

Question 443: What is true about a cold abscess?

A. A sign of acute inflammation is present
B. Non-dependent incision is used (Correct Answer)
C. Suturing of the wound is not done
D. A drain is placed

Explanation: A **cold abscess** is a collection of pus without the classic signs of acute inflammation (heat, redness, pain). It is most commonly associated with **tuberculosis** (secondary to lymph node or spinal involvement). ### **Explanation of Options:** * **B. Non-dependent incision is used (Correct):** Unlike pyogenic abscesses, which are drained via dependent incisions to allow gravity-assisted drainage, cold abscesses are drained via a **non-dependent (high-up) incision**. This creates a "zig-zag" tract that prevents the formation of a persistent **tuberculous sinus**, which is a common complication if the pus leaks continuously through a dependent opening. * **A. Sign of acute inflammation is present:** Incorrect. By definition, a cold abscess lacks "calor" (heat) and "rubor" (redness) because it is a chronic granulomatous process, not an acute pyogenic infection. * **C. Suturing of the wound is not done:** Incorrect. After evacuating the caseous material and curetting the wall, the incision is **sutured primarily** to ensure healing by first intention and to prevent secondary infection or sinus formation. * **D. A drain is placed:** Incorrect. Drains are strictly **avoided** in cold abscesses as they act as a conduit for secondary bacterial infection and promote the development of a chronic discharging sinus. ### **Clinical Pearls for NEET-PG:** * **Treatment of Choice:** Aspiration using a wide-bore needle through healthy skin (to prevent sinus formation) or **Hilton’s method** is not typically used here; instead, formal evacuation and primary closure are preferred. * **Common Sites:** Cervical lymph nodes (most common) and Psoas abscess (secondary to Pott’s spine). * **Pathology:** The "pus" in a cold abscess is actually **caseous necrosis**, not true liquefactive pus containing neutrophils.

Question 444: Increased risk of hepatic malignancy is seen in which benign liver tumor?

A. Hemangioma
B. Hepatic adenoma (Correct Answer)
C. Focal nodular hyperplasia
D. Hemangioendothelioma

Explanation: **Explanation:** **Hepatic Adenoma (HA)** is a benign epithelial liver tumor primarily seen in young women using oral contraceptives. It is the correct answer because it carries a significant risk of **malignant transformation into Hepatocellular Carcinoma (HCC)** (approximately 5–10%) and a high risk of spontaneous rupture leading to intraperitoneal hemorrhage. The risk of malignancy is particularly high in the **β-catenin mutated subtype** and in male patients. Due to these risks, surgical resection is often recommended for adenomas >5 cm or those occurring in men. **Why other options are incorrect:** * **Hemangioma:** This is the most common benign liver tumor. It consists of blood-filled vascular spaces and has **zero malignant potential**. Management is usually conservative unless the patient is symptomatic. * **Focal Nodular Hyperplasia (FNH):** This is a regenerative response to a vascular malformation (characterized by a "central stellate scar"). It is considered a "leave-alone" lesion because it has **no risk of malignancy** or rupture. * **Hemangioendothelioma:** While epithelioid hemangioendothelioma is a rare vascular tumor with "intermediate" or low-grade malignant potential, it is not classified as a standard benign tumor that transforms into HCC in the context of this classic surgical comparison. **High-Yield Clinical Pearls for NEET-PG:** * **Most common benign liver tumor:** Hemangioma. * **Tumor associated with OCPs:** Hepatic Adenoma. * **Central Stellate Scar:** Pathognomonic for FNH (seen on CT/MRI). * **Hot uptake on Sulfur Colloid Scan:** FNH (due to presence of Kupffer cells); Adenomas appear "cold." * **Management Rule:** Asymptomatic Hemangiomas and FNH are managed conservatively; Adenomas >5cm require surgery due to rupture/malignancy risk.

Question 445: A 23-year-old lady presents with acute right lower abdominal pain for 4 hours. There is tenderness at McBurney's point. Which investigation is best suited to confirm the diagnosis of appendicitis?

A. CT Scan (Correct Answer)
B. Plain X-ray
C. Serum ESR
D. MRI Abdomen

Explanation: **Explanation:** The clinical presentation of acute right lower quadrant pain with tenderness at McBurney’s point is highly suggestive of **Acute Appendicitis**. **Why CT Scan is the Correct Answer:** Contrast-enhanced Computed Tomography (CECT) of the abdomen and pelvis is the **gold standard** and the most accurate investigation for confirming the diagnosis of appendicitis in adults. It has a sensitivity and specificity exceeding 95%. Key CT findings include an appendiceal diameter >6 mm, wall thickening, periappendiceal fat stranding, and the presence of an appendicolith. It is particularly useful in differentiating appendicitis from other mimics like mesenteric adenitis or urolithiasis. **Analysis of Incorrect Options:** * **Plain X-ray:** It has very low sensitivity. While it may occasionally show a radio-opaque appendicolith (in 10% of cases) or localized ileus (sentinel loop), it cannot confirm the diagnosis. * **Serum ESR:** This is a non-specific marker of inflammation. While it may be elevated in appendicitis, it is not diagnostic and cannot localize the pathology. * **MRI Abdomen:** While highly accurate, it is expensive, time-consuming, and not the first-line investigation for a 23-year-old non-pregnant adult. It is, however, the **investigation of choice in pregnant women** when Ultrasound is inconclusive. **Clinical Pearls for NEET-PG:** * **Investigation of Choice (General):** CT Scan. * **Investigation of Choice (Children/Pregnant Women):** Ultrasonography (USG) is the initial step to avoid radiation. * **Most Common Sign:** Tenderness at McBurney’s point. * **Alvarado Score:** A clinical scoring system used to bridge the gap between clinical suspicion and surgery (MANTRELS). A score of ≥7 usually indicates surgery.

Question 446: Gut suturing material is absorbed by which process?

A. Oxidation
B. Hydrolysis (Correct Answer)
C. Fibrinolysis
D. Proteolysis

Explanation: **Explanation:** Suture materials are classified based on their absorption profile. The mechanism of absorption depends entirely on whether the suture is **natural** or **synthetic**. **Why Hydrolysis is Correct:** Modern synthetic absorbable sutures (e.g., **Vicryl/Polyglactin 910, Monocryl, PDS**) are broken down by **Hydrolysis**. This is a non-enzymatic process where water molecules penetrate the polymer chains, causing them to fragment. This process is predictable and causes minimal tissue reaction, making it the preferred mechanism for most surgical procedures. **Analysis of Incorrect Options:** * **Proteolysis (Option D):** This is the mechanism for **Natural** absorbable sutures (e.g., **Surgical Catgut**). Catgut is derived from bovine or ovine intestinal submucosa/serosa. Being a foreign protein, it is degraded by lysosomal enzymes from inflammatory cells (proteolysis). This process is unpredictable and causes significant tissue inflammation. * **Oxidation (Option A):** This is not a standard mechanism for suture degradation. While some materials may undergo oxidative stress in the body, it is not the primary mode of absorption for surgical gut or synthetic sutures. * **Fibrinolysis (Option C):** This refers to the breakdown of fibrin clots in the blood coagulation cascade and is unrelated to the degradation of suture polymers. **NEET-PG High-Yield Pearls:** * **Fastest Absorption:** Plain Catgut (loses strength in 7-10 days). * **Longest Strength Retention:** PDS (Polydioxanone) – ideal for slow-healing tissues like fascia. * **Vicryl (Polyglactin 910):** A braided synthetic suture absorbed by hydrolysis; it is the most commonly used suture in general surgery. * **Key Distinction:** Natural = Proteolysis (High inflammation); Synthetic = Hydrolysis (Low inflammation).

Question 447: Which of the following characteristics of this patient might increase the risk of wound infection?

A. History of colon surgery
B. Hypertension
C. Male sex
D. Recipient of chemotherapy (Correct Answer)

Explanation: ***Recipient of chemotherapy*** - Chemotherapy causes **immunosuppression** by reducing white blood cell counts and impairing cellular immune function, significantly increasing infection risk. - **Myelosuppression** from chemotherapy compromises the body's ability to fight bacterial contamination at the surgical site. *History of colon surgery* - Previous colon surgery alone does not inherently increase wound infection risk unless there are active complications like **anastomotic leak** or **bowel obstruction**. - Past surgical history without current complications is not an independent risk factor for new wound infections. *Hypertension* - Hypertension by itself does not directly impair **immune function** or wound healing mechanisms. - While poorly controlled hypertension may affect **tissue perfusion**, it is not considered a primary independent risk factor for wound infection. *Male sex* - Gender alone is not a significant independent risk factor for **surgical site infections**. - Wound infection risk is primarily determined by **immune status**, **surgical factors**, and **comorbidities** rather than sex.

Question 448: All are true in degloving injury except?

A. Can happen in rollover injury caused by a motor vehicle
B. All the non-bleeding skin should be excised
C. Examination under anesthesia is required
D. Injury is less extensive than it actually appears (Correct Answer)

Explanation: **Explanation:** Degloving injuries occur when the skin and subcutaneous tissue are forcibly sheared away from the underlying fascia and muscle, disrupting the perforating blood vessels. **Why Option D is the Correct Answer (The False Statement):** In degloving injuries, the **injury is actually much more extensive than it appears** on the surface. While the skin may look intact or minimally bruised, the underlying vascular supply is often completely severed over a large area. This creates a "dead space" where hematomas and fat necrosis develop, leading to delayed skin necrosis. This is particularly true in "closed degloving" (e.g., Morel-Lavallée lesions). **Analysis of Other Options:** * **Option A:** Rollover injuries by motor vehicles are the classic mechanism. The rotating tire exerts a tangential shearing force that peels the soft tissue off the deep fascia. * **Option B:** Non-bleeding skin indicates a lack of dermal capillary perfusion. This tissue is non-viable and must be excised to prevent infection and facilitate grafting. * **Option C:** Examination under anesthesia (EUA) is mandatory to assess the full extent of the "pocketing," debride necrotic tissue, and thoroughly irrigate the wound. **Clinical Pearls for NEET-PG:** * **Morel-Lavallée Lesion:** A closed degloving injury commonly seen over the greater trochanter. * **Management:** The gold standard is radical debridement. The excised skin, if healthy enough, can sometimes be thinned and reused as a **full-thickness or split-thickness skin graft** (Defatting). * **Fluorescein Dye:** Can be used intraoperatively to assess skin viability; areas that do not fluoresce are non-viable.

Question 449: Which statement about hernia is true?

A. In children, indirect inguinal hernia is treated medically.
B. In Ritcher's hernia, absolute constipation is seen.
C. Indirect inguinal hernia is the most common type. (Correct Answer)
D. The deep inguinal ring is lateral and above the pubic tubercle.

Explanation: ### Explanation **Correct Answer: C. Indirect inguinal hernia is the most common type.** **1. Why Option C is Correct:** Indirect inguinal hernia is the most common type of hernia in **both sexes and all age groups**. It occurs due to the failure of the *processus vaginalis* to obliterate, allowing abdominal contents to protrude through the deep inguinal ring. While direct hernias are more common in the elderly, the indirect type still maintains the highest overall incidence. **2. Why Other Options are Incorrect:** * **Option A:** In children, inguinal hernias are always congenital (indirect) and carry a high risk of incarceration. They **must be treated surgically** (Herniotomy); there is no role for medical management. * **Option B:** In **Richter’s hernia**, only a portion of the bowel wall circumference is trapped. Because the entire lumen is not occluded, bowel continuity is maintained. Therefore, patients may still pass flatus or stool, and **absolute constipation is typically absent**, making it a "deceptive" clinical presentation. * **Option D:** The deep inguinal ring is located at the mid-inguinal point, which is **lateral and above the inferior epigastric artery**. The landmark "lateral and above the pubic tubercle" actually describes the **superficial inguinal ring**. **3. NEET-PG High-Yield Pearls:** * **Most common hernia in females:** Indirect inguinal hernia (though femoral hernias are more common in females than in males). * **Gold Standard Repair:** Lichtenstein tension-free mesh repair. * **Hesselbach’s Triangle:** Boundaries are the Rectus abdominis (medial), Inferior epigastric vessels (lateral), and Inguinal ligament (inferior). Direct hernias occur *inside* this triangle. * **Maydl’s Hernia:** "Retrograde strangulation" where two loops are in the sac and the intervening loop inside the abdomen is strangulated.

Question 450: All of the following are true regarding the histo-immunological types of breast cancer EXCEPT:

A. Molecular classification is based on gene expression profiling.
B. The most common type is Luminal A.
C. Luminal B has the best prognosis. (Correct Answer)
D. Triple-negative breast cancer has the worst prognosis.

Explanation: **Explanation:** This question tests the understanding of the **Molecular Classification of Breast Cancer**, which has largely replaced traditional histological typing for predicting prognosis and guiding therapy. **1. Why Option C is the Correct Answer (The Exception):** The statement "Luminal B has the best prognosis" is incorrect. **Luminal A** is the subtype with the **best prognosis**. Luminal A tumors are ER/PR positive, HER2 negative, and have low levels of the protein Ki-67 (low proliferation index). In contrast, **Luminal B** tumors (ER positive, but may be HER2 positive or have high Ki-67) are more aggressive, have a higher grade, and a higher recurrence rate than Luminal A. **2. Analysis of Other Options:** * **Option A:** Correct. Molecular classification (Perou and Sorlie classification) utilizes **DNA microarray analysis** to categorize tumors based on their unique gene expression patterns. * **Option B:** Correct. **Luminal A** is the most prevalent molecular subtype, accounting for approximately 40–50% of all breast cancers. * **Option D:** Correct. **Triple-negative (Basal-like)** breast cancer lacks ER, PR, and HER2 expression. It is characterized by high recurrence rates, early visceral metastasis, and the **worst overall prognosis** among the four types. **High-Yield Clinical Pearls for NEET-PG:** * **Luminal A:** ER+, PR+, HER2-, Low Ki-67 (<14%). Best prognosis; treated with endocrine therapy. * **Luminal B:** ER+, HER2+/- , High Ki-67 (>14%). Worse prognosis than Luminal A. * **HER2 Enriched:** ER-, PR-, HER2+. Treated with Trastuzumab (Herceptin). * **Triple Negative:** Associated with **BRCA1 mutations**. Most common in young African-American women. * **Ki-67:** A nuclear marker of cellular proliferation; high levels indicate a more aggressive tumor.

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

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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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