General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 651: What is the most common serious complication that can occur following surgery in the maxillary incisor region?

A. Iritis
B. Cellulitis
C. Periapical abscess
D. Cavernous sinus thrombosis (Correct Answer)

Explanation: **Explanation:** The correct answer is **Cavernous Sinus Thrombosis (CST)**. This is a life-threatening complication arising from infections or surgical trauma in the "danger area of the face," which includes the upper lip, nose, and maxillary incisor region. **Why Cavernous Sinus Thrombosis is correct:** The venous drainage of the maxillary incisor region is primarily through the **angular and facial veins**. These veins are unique because they lack valves, allowing for retrograde blood flow. They communicate with the **superior ophthalmic vein**, which drains directly into the cavernous sinus. Surgical trauma or infection in this region can lead to the formation of an infected thrombus that travels backward into the cavernous sinus, leading to CST. This condition presents with chemosis, proptosis, and cranial nerve palsies (III, IV, V1, V2, and VI). **Why other options are incorrect:** * **Iritis:** While inflammatory, it is an intraocular condition and not a direct systemic or vascular complication of dental surgery. * **Cellulitis:** This is a common localized complication (soft tissue infection), but it is generally less "serious" or life-threatening compared to the intracranial spread seen in CST. * **Periapical abscess:** This is usually the *cause* of the need for surgery rather than a complication *following* it. **High-Yield Clinical Pearls for NEET-PG:** * **Danger Area of the Face:** Bound by the commissures of the lips and the bridge of the nose. * **Valveless Veins:** The primary anatomical reason for the spread of infection from the face to the dural venous sinuses. * **First Sign of CST:** Often the involvement of the **Abducens nerve (CN VI)** because it runs centrally through the cavernous sinus, unlike other nerves located in the lateral wall.

Question 652: Excision of the hyoid bone is indicated in which of the following conditions?

A. Sublingual dermoids
B. Ludwig's angina
C. Branchial cyst
D. Thyroglossal cyst (Correct Answer)

Explanation: **Explanation:** The correct answer is **Thyroglossal cyst**. The surgical management of a thyroglossal cyst requires the **Sistrunk Procedure**, which involves the excision of the cyst, the entire tract, and the **central part of the hyoid bone**. **Why the Hyoid Bone is Excised:** During embryonic development, the thyroid gland descends from the foramen caecum at the base of the tongue to its final position in the neck. The thyroglossal duct follows this path, which is intimately related to the development of the hyoid bone. The duct often passes through, or immediately behind, the body of the hyoid. If the central portion of the hyoid is not removed, epithelial remnants of the duct may persist, leading to a high recurrence rate (approx. 50%). With the Sistrunk procedure, recurrence drops to less than 5%. **Analysis of Incorrect Options:** * **Sublingual dermoids:** These are developmental cysts found in the floor of the mouth. Treatment involves simple surgical excision (intraoral or extraoral) without bone resection. * **Ludwig's angina:** This is a rapidly spreading cellulitis of the submandibular space. Management focuses on airway maintenance, intravenous antibiotics, and surgical decompression/drainage if necessary, not bone excision. * **Branchial cyst:** These arise from the remnants of the second branchial cleft. They are typically located along the anterior border of the sternocleidomastoid muscle. Treatment is complete surgical excision of the cyst and its tract (if present), which does not involve the hyoid bone. **High-Yield Clinical Pearls for NEET-PG:** * **Most common location:** Subhyoid (though it can occur anywhere from the foramen caecum to the thyroid cartilage). * **Clinical Sign:** A thyroglossal cyst is a midline neck swelling that **moves upward on protrusion of the tongue** (due to its attachment to the foramen caecum via the duct). * **Sistrunk Procedure:** Includes excision of the cyst + tract + central 1/3rd of the hyoid bone + a core of muscle at the base of the tongue.

Question 653: A 17-year-old female presents with a non-tender, firm, and mobile breast lump. FNAC reveals tightly arranged ductal epithelial cells with dyscohesive bare nuclei. What is the most likely diagnosis?

A. Ductal Carcinoma In Situ (DCIS)
B. Fibroadenoma (Correct Answer)
C. Phyllodes tumor
D. Lobular Carcinoma In Situ (LCIS)

Explanation: **Explanation:** The clinical presentation and cytological findings are classic for a **Fibroadenoma**, the most common benign breast tumor in young females (typically <30 years). **Why Fibroadenoma is correct:** 1. **Clinical Presentation:** A firm, non-tender, and highly mobile lump in a 17-year-old is the classic "Breast Mouse" (so-called because it slips away under the fingers). 2. **FNAC Findings:** The presence of **tightly arranged ductal epithelial cells** (often in staghorn or antler-like patterns) along with **dyscohesive bare bipolar nuclei** in the background is pathognomonic. These bare nuclei represent the myoepithelial cells of the stroma. **Why other options are incorrect:** * **DCIS & LCIS:** These are typically seen in older women (post-menopausal). On FNAC, DCIS would show malignant features like pleomorphism and necrosis, while LCIS often lacks the characteristic stromal component and bare nuclei seen here. * **Phyllodes Tumor:** While it shares features with fibroadenoma (biphasic), it usually presents in older age groups (40-50s), grows rapidly, and shows increased stromal cellularity with leaf-like projections and frequent mitoses on histology. **High-Yield Clinical Pearls for NEET-PG:** * **Most common benign tumor of the breast:** Fibroadenoma. * **"Breast Mouse":** Due to high mobility within the breast tissue. * **Giant Fibroadenoma:** Defined as a fibroadenoma >5 cm in size or >500g in weight. * **Management:** Conservative if <3 cm and asymptomatic; surgical excision if rapidly increasing in size or for cosmetic reasons. * **Triple Assessment:** Clinical exam, Imaging (USG in young, Mammography in >35y), and Pathology (FNAC/Core Biopsy).

Question 654: Which of the following is a delayed absorbable synthetic suture material?

A. Chromic catgut
B. Vicryl (Correct Answer)
C. Silk
D. Nylon

Explanation: **Explanation:** The classification of suture materials is a high-yield topic for NEET-PG, based on two criteria: origin (natural vs. synthetic) and longevity (absorbable vs. non-absorbable). **Why Vicryl is Correct:** **Vicryl (Polyglactin 910)** is a **synthetic, braided, absorbable** suture. It is classified as "delayed absorbable" because it retains approximately 50% of its tensile strength at 3 weeks and is completely absorbed via **hydrolysis** within 60–90 days. This makes it ideal for sub-cutaneous tissue and soft tissue approximation. **Analysis of Incorrect Options:** * **Chromic Catgut:** This is a **natural absorbable** suture derived from the submucosa of sheep intestine or serosa of bovine intestine. It is treated with chromic acid salts to delay absorption, but it is not synthetic and is absorbed via enzymatic digestion (causing more tissue reaction). * **Silk:** This is a **natural non-absorbable** suture. While it may technically degrade over several years, it is clinically classified as non-absorbable. It is braided and known for excellent handling but high tissue reactivity. * **Nylon (Ethilon):** This is a **synthetic non-absorbable** monofilament. It is commonly used for skin closure due to its high tensile strength and low infection risk. **High-Yield Clinical Pearls for NEET-PG:** * **Fastest absorption:** Plain catgut (7–10 days). * **Longest-acting synthetic absorbable:** PDS (Polydioxanone) – maintains strength for up to 6 weeks; ideal for abdominal wall closure. * **Absorption mechanism:** Synthetic sutures (Vicryl, PDS, Monocryl) undergo **hydrolysis** (less reaction), while natural sutures (Catgut) undergo **enzymatic degradation** (more reaction). * **Suture of choice for vascular anastomosis:** Prolene (Polypropylene) – synthetic, non-absorbable monofilament with the least thrombogenicity.

Question 655: All of the following are premalignant lesions except?

A. Extramammary Paget's disease
B. Giant congenital pigmented naevus
C. Dysplastic naevus
D. Salmon patch (Correct Answer)

Explanation: **Explanation:** The correct answer is **Salmon patch** because it is a benign vascular malformation, not a premalignant lesion. **1. Why Salmon Patch is the Correct Answer:** A Salmon patch (also known as *nevus simplex* or "stork bite/angel kiss") is a common capillary malformation seen in newborns. It is characterized by pink or red patches, typically on the nape of the neck, eyelids, or forehead. These are entirely benign, do not undergo malignant transformation, and usually fade spontaneously within the first few years of life. **2. Analysis of Incorrect Options (Premalignant Lesions):** * **Extramammary Paget's Disease (EMPD):** This is a rare intraepidermal adenocarcinoma. It is considered a premalignant condition because it is frequently associated with an underlying internal malignancy (e.g., adnexal, colorectal, or bladder cancer) or can progress to invasive squamous cell carcinoma. * **Giant Congenital Pigmented Naevus:** These are large melanocytic nevi present at birth. They carry a significant lifetime risk (approximately 5–10%) of developing into **Malignant Melanoma**, necessitating close monitoring or prophylactic excision. * **Dysplastic Naevus:** Also known as atypical moles, these are histologically distinct melanocytic nevi. They are well-established precursors and clinical markers for an increased risk of cutaneous melanoma. **Clinical Pearls for NEET-PG:** * **Salmon Patch vs. Port-wine Stain:** Unlike Salmon patches, Port-wine stains (*Nevus Flammeus*) do not fade with age and may be associated with **Sturge-Weber Syndrome**. * **Rule of 20:** Giant congenital nevi are often defined as those predicted to reach >20 cm in diameter by adulthood. * **Other common premalignant skin lesions:** Actinic keratosis (precursor to SCC), Bowen’s disease (SCC in situ), and Xeroderma pigmentosum.

Question 656: Which hernia occurs below and lateral to the pubic tubercle?

A. Femoral Hernia (Correct Answer)
B. Inguinal hernia
C. Morgagnian Hernia
D. Sliding Hernia

Explanation: **Explanation:** The anatomical relationship to the **pubic tubercle** is the most critical landmark for differentiating groin hernias. **1. Why Femoral Hernia is Correct:** A femoral hernia passes through the femoral canal, which is located inferior to the inguinal ligament. Anatomically, the femoral canal lies **below and lateral** to the pubic tubercle. This is a high-yield distinction because femoral hernias are more common in females due to a wider pelvis and are highly prone to incarceration and strangulation due to the rigid boundaries of the femoral ring. **2. Why the Other Options are Incorrect:** * **Inguinal Hernia:** These occur **above and medial** to the pubic tubercle. They pass through the inguinal canal (indirect) or Hesselbach’s triangle (direct), both of which are superior to the inguinal ligament. * **Morgagnian Hernia:** This is a type of congenital diaphragmatic hernia occurring through the Foramen of Morgagni (retrosternal/parasternal). It presents in the chest/upper abdomen, not the groin. * **Sliding Hernia:** This refers to a hernia where a portion of a visceral organ (like the cecum or bladder) forms part of the hernia sac wall. While it can be inguinal, the term describes the *content* rather than a specific anatomical location relative to the tubercle. **NEET-PG Clinical Pearls:** * **The Rule of Thumb:** Above and Medial = Inguinal; Below and Lateral = Femoral. * **Most Common Hernia:** Indirect Inguinal hernia is the most common type in both males and females. * **Highest Risk of Strangulation:** Femoral hernia (due to the sharp edge of the lacunar ligament). * **McVay Repair:** The surgical procedure of choice for femoral hernias, involving the suturing of the conjoined tendon to Cooper’s ligament.

Question 657: Fever in a burnt patient is caused by what?

A. Septicemia (Correct Answer)
B. Hypermetabolism
C. Decreased sweating
D. Release of pyrogens from necrotic tissue

Explanation: **Explanation:** In the context of burn injuries, **Septicemia (Option A)** is the most significant and clinically relevant cause of fever. While several factors can elevate body temperature in burn patients, a true fever (especially one occurring after the initial 48 hours) is considered a hallmark of invasive infection. The loss of the skin barrier, combined with the presence of necrotic tissue (eschar) and impaired immune response, makes burn patients highly susceptible to bacterial translocation and systemic infection, primarily by *Pseudomonas aeruginosa* or *Staphylococcus aureus*. **Analysis of Incorrect Options:** * **Hypermetabolism (Option B):** Burn patients do experience a massive hypermetabolic state due to a "cytokine storm" and catecholamine release, which increases the basal metabolic rate and core temperature. However, in the context of a clinical exam, fever is traditionally attributed to infection unless proven otherwise. * **Decreased sweating (Option C):** While damaged sweat glands in deep burns can impair thermoregulation (leading to hyperthermia in hot environments), it is not the primary mechanism for the systemic fever seen in the clinical course of a burn victim. * **Release of pyrogens (Option D):** While necrotic tissue can release endogenous pyrogens, this usually contributes to a low-grade temperature spike in the early phase. Persistent or high-grade fever is more definitively linked to the systemic inflammatory response triggered by sepsis. **Clinical Pearls for NEET-PG:** * **Most common cause of death** in burns after the first 48 hours is **Sepsis**. * **Burn Wound Sepsis** is defined as >10⁵ organisms per gram of tissue. * **First sign of burn wound sepsis:** Often a change in the color of the eschar, graft loss, or ileus, rather than just fever. * **Topical Antibiotic of Choice:** Silver Sulfadiazine (standard), Mafenide Acetate (penetrates eschar, used in ear burns).

Question 658: Spigelian hernia is typically seen in which anatomical region?

A. Lumbar triangle
B. Subumbilical region (Correct Answer)
C. Paraumbilical region
D. Supraumbilical region

Explanation: **Explanation:** A **Spigelian hernia** (also known as a spontaneous lateral ventral hernia) occurs through a defect in the **Spigelian fascia**. This fascia is the aponeurotic layer located between the lateral border of the rectus abdominis muscle and the semilunar line (the junction of the muscular fibers of the transversus abdominis with its aponeurosis). **Why Option B is correct:** The Spigelian fascia is widest and weakest in the **subumbilical region**, specifically where the posterior rectus sheath terminates at the **arcuate line (of Douglas)**. Below this line, all aponeurotic layers pass anterior to the rectus muscle, leaving the area structurally vulnerable. Most Spigelian hernias occur within the "Spigelian hernia belt," a 6 cm wide transverse zone located just above the interspinal plane. **Why other options are incorrect:** * **A. Lumbar triangle:** This is the site for lumbar hernias (Petit’s triangle or Grynfeltt-Lesshaft triangle), located in the posterior abdominal wall. * **C & D. Paraumbilical/Supraumbilical regions:** While the Spigelian fascia extends superiorly, the aponeurotic fibers are much stronger and the fascia is narrower above the umbilicus, making hernias in these regions extremely rare. **Clinical Pearls for NEET-PG:** * **"Interstitial Hernia":** It is often called an interstitial hernia because the sac typically lies deep to the external oblique aponeurosis, making it difficult to diagnose on physical exam (no obvious bulge). * **High Risk of Strangulation:** Due to the narrow, rigid neck of the defect, the risk of incarceration and strangulation is high; thus, surgical repair is always indicated. * **Diagnosis:** Ultrasound or CT scan is the gold standard for diagnosis when clinical suspicion is high but no mass is palpable.

Question 659: What does the Ross procedure involve?

A. Replacement of the aortic valve with a pulmonic homograft.
B. Replacement of the aortic valve with an autologous pulmonic valve and implantation of a pulmonic valve homograft. (Correct Answer)
C. Replacement of the mitral valve with a tissue prosthesis and repair of the tricuspid valve.
D. Replacement of the aortic valve with a porcine valve and repair of the pulmonary valve.

Explanation: The **Ross procedure**, also known as a pulmonary autograft, is a specialized cardiac surgery primarily used for aortic valve disease in children and young adults. ### **Explanation of the Correct Answer (B)** The core principle of the Ross procedure is using the patient’s own tissue to replace a diseased aortic valve. It involves two main steps: 1. **Autograft:** The patient’s own **pulmonary valve** is removed and relocated to the **aortic position**. Because it is living tissue, it can grow with the patient (crucial for children) and does not require lifelong anticoagulation. 2. **Homograft:** A cadaveric **pulmonary valve (homograft)** is then used to replace the patient’s original pulmonary valve. Since the right side of the heart operates under lower pressure, the homograft lasts significantly longer here than it would in the aortic position. ### **Why Other Options are Incorrect** * **Option A:** This describes a simple homograft replacement. While used in some cases (e.g., endocarditis), it lacks the growth potential and durability of the autograft used in the Ross procedure. * **Option C:** This describes a double valve procedure (mitral and tricuspid) unrelated to the Ross technique. * **Option D:** This describes a xenograft (porcine) replacement, which has a high failure rate in young patients due to calcification. ### **High-Yield NEET-PG Pearls** * **Indications:** Preferred in infants, children, and women of childbearing age who wish to avoid Warfarin. * **Advantages:** Excellent hemodynamics, no need for long-term anticoagulation, and **potential for growth** (the only valve replacement that grows with the child). * **Disadvantage:** It is a technically demanding "two-valve" operation for a "one-valve" disease. * **Key Association:** Often tested alongside the **Bentall Procedure** (which involves replacement of the aortic valve, aortic root, and ascending aorta with re-implantation of coronary arteries).

Question 660: Burst abdomen following laparotomy typically occurs after how many days?

A. 1-2 days
B. 6-9 days (Correct Answer)
C. 2 weeks
D. 4 weeks

Explanation: **Explanation:** **Burst Abdomen (Abdominal Wound Dehiscence)** is a serious postoperative complication where the layers of the abdominal wall separate, often leading to evisceration. **Why 6-9 days is correct:** The integrity of a surgical wound depends on the balance between the degradation of old collagen and the synthesis of new collagen. The **lag phase** of wound healing occurs during the first 5 days, where tensile strength is at its lowest and the wound relies entirely on sutures. Between **days 6 and 9**, the sutures may begin to cut through the tissues (especially if there is excessive tension or infection), while the new collagen hasn't yet gained sufficient strength to hold the edges together. This "weak window" is when most dehiscences occur. **Analysis of Incorrect Options:** * **1-2 days (Option A):** Too early. At this stage, the sutures are fresh and the tissue has not yet undergone the enzymatic softening (collagenolysis) that leads to "cutting out." * **2 weeks (Option C):** By day 14, the proliferative phase is well underway, and the wound has regained enough tensile strength to resist most dehiscing forces. * **4 weeks (Option D):** This is the remodeling phase. Failure at this stage is rare and would typically present as an incisional hernia rather than an acute "burst." **NEET-PG High-Yield Pearls:** * **The "Pink Serous Discharge" Sign:** A serosanguinous (pinkish) discharge from the wound on the 5th or 6th day is the most important clinical herald of an impending burst abdomen. * **Most Common Cause:** Technical error (e.g., sutures tied too tightly or too close to the edge). * **Risk Factors:** Increased intra-abdominal pressure (coughing, distension), malnutrition (hypoalbuminemia), and emergency surgeries. * **Management:** Immediate coverage with sterile saline-soaked gauze followed by urgent surgical re-closure (usually using "tension sutures").

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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