General Surgery Principles — MCQs

A 49-year-old man suffering from depression attempts suicide by jumping out of the window of his third-floor apartment. He requires multiple operations during a prolonged, complicated hospital stay. Endotracheal intubation is attempted in the ICU but is unsuccessful because of tracheal stenosis, which is attributed to which of the following?

Q569Easy

What is a contraindication for Digital Rectal Examination (DRE)?

Q570Easy

During splenectomy for ITP, at what point is platelet infusion typically given?

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 561: A mandibular dental infection that exits the buccal cortical plate above the muscle attachment will cause an abscess of which space?

A. Buccal space
B. Masseter space
C. Vestibular sulcus (Correct Answer)
D. Masticatory space

Explanation: **Explanation:** The spread of odontogenic infections is primarily determined by the relationship between the site of cortical plate perforation and the site of **muscle attachments**. **1. Why Vestibular Sulcus is Correct:** When a mandibular dental infection perforates the buccal cortical plate, its destination depends on the **Buccinator muscle** attachment. If the infection exits **above** the muscle attachment (superior to the buccinator on the mandible), it is trapped between the alveolar bone and the overlying oral mucosa. This localized collection results in a **Vestibular sulcus abscess** (parulis). Because it is "inside" the muscle's line of attachment relative to the oral cavity, it presents as a swelling within the mouth rather than the face. **2. Why the other options are incorrect:** * **Buccal Space:** This occurs if the infection exits **below** the buccinator attachment on the mandible (or above it in the maxilla). The infection then spreads into the space between the buccinator and the skin/subcutaneous tissue, causing visible facial swelling. * **Masseter/Masticatory Space:** These spaces are involved when infections spread posteriorly toward the ramus of the mandible or involve the muscles of mastication (masseter, pterygoids). These typically present with severe **trismus**, which is not a primary feature of a simple vestibular abscess. **Clinical Pearls for NEET-PG:** * **The "Rule of Muscle Attachment":** If the perforation is **internal** to the muscle attachment, it stays in the **vestibule**. If it is **external/beyond** the attachment, it enters a **fascial space**. * **Mandibular Molars:** The 2nd and 3rd molars often have roots that lie below the **Mylohyoid muscle** attachment. Therefore, infections here often spread to the **Submandibular space** rather than the sublingual space. * **Key Landmark:** The **Buccinator** is the key muscle for determining Buccal space vs. Vestibular involvement.

Question 562: Which type of hernia contains another viscus as its posterior wall?

A. Hernia en glissade (Correct Answer)
B. Richter Hernia
C. Maydl Hernia
D. Spigelian hernia

Explanation: **Explanation:** **Hernia en glissade (Sliding Hernia)** is the correct answer. In this condition, a retroperitoneal organ (most commonly the **cecum** on the right or the **sigmoid colon** on the left) slides down such that it forms part of the posterior wall of the hernia sac. The visceral peritoneum covering the organ becomes continuous with the parietal peritoneum of the sac. This is clinically significant because accidental injury to the bowel can occur if the surgeon mistakes the viscus for the sac itself. **Analysis of Incorrect Options:** * **Richter Hernia:** Only a portion of the bowel wall (usually the antimesenteric border) is trapped within the hernia sac. It can lead to strangulation without causing complete intestinal obstruction. * **Maydl Hernia (Retrograde Hernia):** This involves a "W-shaped" loop of bowel where two loops are in the sac, but the intervening loop remains in the abdomen. The intra-abdominal loop is at the highest risk of strangulation. * **Spigelian Hernia:** An interstitial hernia occurring through the Spigelian fascia (aponeurosis of the transversus abdominis) at the level of the arcuate line. **High-Yield Clinical Pearls for NEET-PG:** * **Most common organ involved:** Bladder (especially in direct inguinal sliding hernias) or Sigmoid colon. * **Demographics:** Most common in elderly males with long-standing inguinal hernias. * **Surgical Note:** Never attempt a high ligation of the sac in a sliding hernia; instead, the sac should be replaced into the abdomen (Bevan’s technique). * **Littre’s Hernia:** A hernia containing a Meckel’s diverticulum. * **Amyand’s Hernia:** An inguinal hernia containing the appendix.

Question 563: Which of the following retractors is used for retracting the lingual flap due to the close proximity of the lingual nerve to the mandibular third molar?

A. Howarth retractor (Correct Answer)
B. Austin retractor
C. L retractor
D. Any of the above

Explanation: **Explanation:** The correct answer is **A. Howarth retractor**. **Why it is correct:** The extraction of an impacted mandibular third molar carries a significant risk of injury to the **lingual nerve**, which lies in close proximity to the lingual cortical plate. To protect this nerve, a subperiosteal dissection is performed, and a retractor is placed between the bone and the soft tissue flap. The **Howarth periosteal elevator/retractor** is the instrument of choice for this purpose. Its thin, curved blade allows it to be inserted gently between the lingual plate and the mucoperiosteum, effectively shielding the lingual nerve from the surgical drill or elevators during bone removal and tooth sectioning. **Why other options are incorrect:** * **B. Austin Retractor:** This is a small, right-angled retractor primarily used for retracting the **buccal flap** (cheek) or mucoperiosteal flaps in limited surgical fields. It is not designed for the delicate protection required on the lingual aspect. * **C. L Retractor (Langhenbeck):** These are generally used for retracting skin, fat, or muscle in general surgery or for retracting the cheek in oral surgery. They lack the specific contour and thin profile needed to safely retract the lingual flap without causing trauma. **Clinical Pearls for NEET-PG:** * **Lingual Nerve Anatomy:** It is located in the gingivolingual sulcus, often just 2-3mm below the alveolar crest in the third molar region. * **Howarth’s Dual Use:** It is a versatile instrument used both as a **periosteal elevator** (to reflect the flap) and as a **retractor** (to protect the flap). * **Ward’s Incision:** The standard incision for third molar surgery; the Howarth retractor is essential once the lingual aspect of this incision is reflected.

Question 564: All are true about a paraumbilical hernia except?

A. Occurs adjacent to the umbilicus
B. Can lead to Richter's hernia
C. High chances of strangulation
D. Conservative management is indicated (Correct Answer)

Explanation: **Explanation:** A **paraumbilical hernia** is an acquired protrusion of extraperitoneal fat or a peritoneal sac through a defect in the linea alba, typically just above or below the umbilicus. Unlike umbilical hernias in children, which often close spontaneously, paraumbilical hernias in adults are progressive and carry a high risk of complications. **Why Option D is the correct answer:** Conservative management is **not** indicated for paraumbilical hernias. Because the defect is usually small and the edges are fibrous and rigid, there is a **high risk of strangulation** of the contents (usually omentum or small bowel). Therefore, surgical repair (Mayo’s operation or mesh rectopexy) is recommended upon diagnosis, regardless of symptoms. **Analysis of other options:** * **Option A:** True. It occurs through the linea alba adjacent to the umbilical cicatrix, not through the umbilical scar itself. * **Option B:** True. Because the neck of the hernia is often narrow, it can trap only a portion of the bowel wall, leading to a **Richter’s hernia**, which is notorious for causing gangrene without signs of complete intestinal obstruction. * **Option C:** True. The narrow, rigid neck of the defect makes these hernias particularly prone to incarceration and subsequent strangulation. **High-Yield Clinical Pearls for NEET-PG:** * **Demographics:** Most common in middle-aged, obese women (associated with multiple pregnancies). * **Contents:** Omentum is the most common content (forming an epiplocele), followed by the small intestine. * **Surgical Management:** Small defects (<2 cm) may undergo primary suture repair; larger defects require **mesh repair** (sublay or onlay) to reduce recurrence rates. * **Distinction:** Unlike congenital umbilical hernias, paraumbilical hernias never resolve spontaneously.

Question 565: A vertical section of the ramus of the mandible is performed in which condition?

A. Mandibular protrusion (Correct Answer)
B. Mandibular retrusion
C. Maxillary prognathism
D. Maxillary retrognathism

Explanation: **Explanation:** The **Vertical Subsygmoid Osteotomy (VSO)** or vertical ramus osteotomy is a surgical procedure primarily used to correct **Mandibular Protrusion (Prognathism)**. In this procedure, a vertical cut is made from the sigmoid notch down to the lower border of the mandible, posterior to the mandibular foramen. This allows the tooth-bearing segment of the mandible to be slid backward (setback) to achieve a normal occlusion. It is preferred for large setbacks because it is technically simpler and carries a lower risk of inferior alveolar nerve injury compared to the Sagittal Split Osteotomy (SSO). **Analysis of Options:** * **Mandibular Retrusion (Option B):** This condition (Retrognathism) requires the mandible to be moved forward. The **Bilateral Sagittal Split Osteotomy (BSSO)** is the gold standard here, as it provides a broad surface area for bone healing and allows for stable advancement. * **Maxillary Prognathism/Retrognathism (Options C & D):** These are deformities of the upper jaw. They are typically corrected using the **Le Fort I Osteotomy**, which allows the maxilla to be repositioned in three dimensions. **Clinical Pearls for NEET-PG:** * **BSSO (Bilateral Sagittal Split Osteotomy):** The most versatile procedure; used for both mandibular advancement (retrusion) and setback (protrusion). * **Genioplasty:** Specifically refers to the surgical repositioning of the chin point only, without affecting occlusion. * **Distraction Osteogenesis:** Often used for severe mandibular hypoplasia (e.g., Pierre Robin Sequence). * **Nerve at Risk:** The **Inferior Alveolar Nerve** is the most commonly discussed structure during mandibular osteotomies.

Question 566: What anatomical structure is typically found within an epiplocele?

A. Intestine
B. Omentum (Correct Answer)
C. Colon
D. Urinary bladder

Explanation: **Explanation:** The term **Epiplocele** is derived from the Greek word *epiploon*, which means **omentum**. It refers to a type of hernia where the contents of the hernial sac consist exclusively of the greater omentum. **1. Why Omentum is Correct:** In general surgery, hernias are classified based on their contents. When the greater omentum (a double-layered fold of peritoneum) protrudes through a defect in the abdominal wall, it is termed an epiplocele. This is a common finding in umbilical, epigastric, and incisional hernias. **2. Why the Other Options are Incorrect:** * **Intestine (A) & Colon (C):** If the hernial sac contains loops of the small intestine or the large bowel, it is referred to as an **enterocele**. While these are common hernia contents, they do not define an epiplocele. * **Urinary Bladder (D):** The bladder can occasionally be found in a sliding inguinal hernia or a femoral hernia (cystocele), but it is not the anatomical component of an epiplocele. **3. Clinical Pearls for NEET-PG:** * **Richter’s Hernia:** Only a part of the circumference of the bowel wall is trapped, which can lead to strangulation without causing complete intestinal obstruction. * **Maydl’s Hernia:** A "W-shaped" hernia containing two loops of bowel within the sac, with a third intervening loop remaining in the abdomen (often the loop at risk for gangrene). * **Littre’s Hernia:** A hernia sac containing a Meckel’s diverticulum. * **Amyand’s Hernia:** An inguinal hernia sac containing the vermiform appendix. * **High-Yield Fact:** Omentum is often referred to as the **"Policeman of the Abdomen"** because it migrates to sites of inflammation to wall off infections.

Question 567: What is the tensile strength of a wound at different stages?

A. Is 10% at the time of suture removal (typically 1 week)
B. Is 70-80% in the 3rd month
C. Achieves plateau in the 3rd month
D. All of the above (Correct Answer)

Explanation: The tensile strength of a wound represents its ability to resist rupture and is primarily determined by the synthesis, cross-linking, and remodeling of **Type I collagen**. Understanding the timeline of wound healing is a high-yield topic for NEET-PG. ### **Explanation of Options:** * **Option A:** At the end of the first week (when sutures are typically removed), the wound is in the early proliferative phase. At this stage, the tensile strength is only about **10%** of that of unwounded skin. This explains why wounds are prone to dehiscence if subjected to excessive tension immediately after suture removal. * **Option B:** There is a rapid increase in strength between weeks 3 and 6. By the **3rd month (90 days)**, the tensile strength reaches approximately **70–80%** of normal skin. * **Option C:** The remodeling phase involves the replacement of Type III collagen with Type I. The rate of strength gain slows down significantly after 3 months, achieving a **plateau**. It is important to note that a scar **never** regains 100% of the original strength of unwounded skin; it maxes out at roughly 80%. ### **High-Yield Clinical Pearls for NEET-PG:** 1. **Collagen Shift:** During early healing (Day 3-7), Type III collagen predominates. In the remodeling phase, **Type I collagen** becomes dominant. 2. **Maximum Strength:** A healed wound reaches its maximum strength at **1 year**, but it remains 20% weaker than original tissue. 3. **Critical Period:** The first 21 days are the most critical for wound support, as collagen synthesis is at its peak. 4. **Vitamin C & Zinc:** Deficiencies in these impair collagen cross-linking, leading to poor tensile strength.

Question 568: A 49-year-old man suffering from depression attempts suicide by jumping out of the window of his third-floor apartment. He requires multiple operations during a prolonged, complicated hospital stay. Endotracheal intubation is attempted in the ICU but is unsuccessful because of tracheal stenosis, which is attributed to which of the following?

A. Prolonged nasotracheal intubation (Correct Answer)
B. Orotracheal intubation
C. Tracheostomy tubes
D. High oxygen delivery

Explanation: **Explanation** The correct answer is **A. Prolonged nasotracheal intubation.** **1. Why Option A is Correct:** Tracheal stenosis is a known complication of prolonged intubation. The primary mechanism is **pressure necrosis**. In nasotracheal intubation, the tube is typically smaller in diameter than an orotracheal tube, requiring a **higher-pressure cuff** to maintain a seal. This high cuff pressure exceeds the capillary perfusion pressure of the tracheal mucosa (approx. 25-30 mmHg), leading to ischemia, mucosal ulceration, and eventual healing by fibrosis and cicatrization (stenosis). Nasotracheal tubes also have a higher propensity for movement and friction against the posterior glottis and subglottis compared to other methods. **2. Why Other Options are Incorrect:** * **B. Orotracheal intubation:** While it can cause stenosis, it is statistically less likely to cause severe subglottic or tracheal stenosis compared to nasotracheal intubation because larger tubes can be used with lower-pressure cuffs. * **C. Tracheostomy tubes:** While tracheostomy can cause stenosis (usually at the stoma site or cuff site), it is often the *treatment* or the preferred alternative to prevent the laryngeal/subglottic damage caused by prolonged translaryngeal (naso/oro) intubation. * **D. High oxygen delivery:** Oxygen concentration affects lung parenchyma (e.g., absorption atelectasis or oxygen toxicity/free radical damage) but does not cause mechanical structural changes like tracheal stenosis. **3. NEET-PG High-Yield Pearls:** * **Most common site of stenosis:** The level of the **cuff** (due to pressure) or the **stoma** (in tracheostomy). * **Prevention:** Maintain cuff pressure between **20-30 cm H2O**. * **Timing:** If intubation is expected to exceed 7–14 days, a tracheostomy is usually indicated to prevent subglottic stenosis. * **Management:** The gold standard for mature, short-segment stenosis is **Tracheal Resection and End-to-End Anastomosis**.

Question 569: What is a contraindication for Digital Rectal Examination (DRE)?

A. Acute anal fissure (Correct Answer)
B. Pilonidal sinus
C. Polyps
D. All of the above

Explanation: **Explanation:** The **Digital Rectal Examination (DRE)** is a fundamental clinical skill, but it is contraindicated in conditions where the procedure would cause extreme pain or risk worsening the pathology. **1. Why Acute Anal Fissure is the Correct Answer:** An acute anal fissure is a longitudinal tear in the anoderm, most commonly located in the posterior midline. It is characterized by intense **sphincter spasm** and severe pain. Attempting a DRE in this state is excruciating for the patient and can further tear the mucosa. In clinical practice, if a fissure is suspected, the diagnosis is made by gentle inspection (parting the buttocks); a DRE is deferred until the acute pain subsides or is performed under anesthesia. **2. Why the Other Options are Incorrect:** * **Pilonidal Sinus:** This is an infection/tract located in the natal cleft, usually over the sacrococcygeal area. It does not involve the anal canal or rectum; therefore, a DRE is not contraindicated (though it may not be diagnostic for this specific condition). * **Polyps:** DRE is actually a primary screening tool for palpable rectal polyps or masses. Identifying the size, consistency, and distance from the anal verge is essential for surgical planning. **Clinical Pearls for NEET-PG:** * **Absolute Contraindications:** Imperforate anus (in neonates) and severe anal stenosis. * **Relative Contraindications:** Acute anal fissure, thrombosed external hemorrhoids, and acute prostatitis (risk of inducing bacteremia, though gentle DRE is sometimes performed). * **High-Yield Fact:** The most common position for DRE is the **Left Lateral (Sims) position**. In cases of suspected prostatic pathology, the knee-elbow position may be preferred.

Question 570: During splenectomy for ITP, at what point is platelet infusion typically given?

A. Immediately after ligating the splenic vein (Correct Answer)
B. Immediately after removal of the spleen
C. After the incision is made
D. The day after surgery

Explanation: **Explanation:** In patients with Immune Thrombocytopenic Purpura (ITP), the spleen is the primary site of both anti-platelet antibody production and the sequestration/destruction of antibody-coated platelets. **Why Option A is correct:** The goal of platelet transfusion in ITP is to increase the circulating platelet count to ensure surgical hemostasis. If platelets are infused *before* the splenic blood supply is cut off, the spleen will immediately sequester and destroy the newly infused platelets, rendering the transfusion ineffective. Therefore, the optimal time is **immediately after ligating the splenic vein** (or after the splenic artery and vein are both secured). At this point, the "platelet trap" is effectively disconnected from the systemic circulation, allowing the infused platelets to circulate and aid in final hemostasis during the remainder of the procedure. **Why other options are incorrect:** * **Option B:** Waiting until the spleen is entirely removed is often too late, as significant oozing can occur during the dissection of the splenic attachments after the vessels are tied. * **Option C:** Giving platelets after the incision (but before ligation) results in rapid destruction of the platelets by the hyperactive spleen, wasting the resource and failing to improve the count. * **Option D:** Post-operative transfusion is only indicated if there is active bleeding; the goal is to prevent intra-operative hemorrhage. **High-Yield Clinical Pearls for NEET-PG:** * **Indication for Splenectomy in ITP:** Failure of medical management (Corticosteroids, IVIG, or Rituximab). * **Accessory Spleens:** Must be searched for in the splenic hilum and gastrosplenic ligament to prevent recurrence of ITP. * **Vaccination:** Post-splenectomy patients must receive vaccinations against encapsulated organisms (*S. pneumoniae, H. influenzae, N. meningitidis*) ideally 2 weeks before elective surgery. * **Platelet Target:** Surgery is generally safe if the platelet count is $>50,000/mm^3$. Transfusion is reserved for counts lower than this or active surgical bleeding.

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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