General Surgery Principles Practice Questions

Q: Surgical approaches for open thymectomy include all except?

Thoracoabdominal incision. **Explanation:** The thymus is located in the **anterior superior mediastinum**, lying behind the manubrium and body of the sternum. Surgical access must therefore focus on the midline of the chest or the lower neck. **Why Thoracoabdominal incision is the correct answer:** A **thoracoabdominal incision** is used to access the upper abdominal organs (like the esophagus or stomach) and the lower thoracic cavity simultaneously. Since the thymus is situated superiorly in the mediastinum, this incision is anatomically inappropriate and unnecessarily invasive, providing no direct access to the thymic bed. **Analysis of other options:** * **Median Sternotomy (Option B):** This is the **gold standard** and most common approach for open thymectomy. It provides excellent exposure of the entire thymus, both innominate veins, and the pleural spaces. * **Partial Median Sternotomy (Option D):** Also known as a "manubriotomy," this is a less invasive version of the full sternotomy, suitable for smaller thymomas or non-thymomatous myasthenia gravis. * **Transcervical Thymectomy (Option A):** This approach involves a transverse incision in the lower neck. While it offers less exposure than a sternotomy, it is a recognized open technique for simple thymectomy (often assisted by a sternal retractor). **High-Yield Clinical Pearls for NEET-PG:** * **Most common indication:** Myasthenia Gravis (to achieve remission) and Thymoma. * **Anatomical Landmark:** The thymus is most commonly found in the **Anterior Mediastinum**. * **Safe Dissection:** During thymectomy, the most critical structure to identify and protect is the **Phrenic Nerve**, which runs lateral to the thymus. * **Modern Trend:** While these are "open" approaches, **VATS (Video-Assisted Thoracoscopic Surgery)** and Robotic-assisted thymectomy are now the preferred minimally invasive standards in many centers.

Q: Which suture material is least adherent to tissue and possesses plasticity?

Prolene. **Explanation:** The correct answer is **Prolene (Polypropylene)**. **Why Prolene is Correct:** Prolene is a synthetic, non-absorbable, monofilament suture. It is characterized by its **high tensile strength** and **extreme smoothness**, making it the least adherent to tissues. This property allows for "atraumatic" removal, which is why it is the gold standard for intradermal (subcuticular) skin closures. Furthermore, Prolene possesses **plasticity**—the ability to expand and accommodate tissue edema without cutting through the tissue, and then maintaining its shape once the swelling subsides. **Analysis of Incorrect Options:** * **Nylon (Ethilon):** While also a monofilament with low tissue reactivity, it possesses **elasticity** (returns to original length) rather than plasticity. It also has high "memory," making it stiffer and more prone to knot slippage compared to Prolene. * **PDS (Polydioxanone):** This is a synthetic **absorbable** monofilament. While it has low friction, it is not used for its non-adherent properties in the long term as it eventually undergoes slow hydrolysis. * **Silk:** A natural, braided material. It has the **highest tissue reactivity** and adherence among the options. Its braided nature allows bacteria to lodge within the strands, increasing infection risk. **NEET-PG High-Yield Pearls:** * **Suture of choice for Vascular Surgery:** Prolene (due to its non-thrombogenic nature and strength). * **Suture of choice for Contaminated wounds:** Monofilaments (like Prolene or PDS) are preferred over braided sutures (like Silk or Vicryl). * **Memory:** The tendency of a suture to return to its original packaged shape (High in Nylon/Prolene). * **Capillarity:** The process by which fluid/bacteria are "wicked" into the suture (Highest in braided sutures like Silk).

Q: A flexible bronchoscope is designed for all of the following functions EXCEPT?

Removal of foreign bodies. **Explanation:** The core concept distinguishing bronchoscopy techniques is the trade-off between **maneuverability** and **instrumental capacity**. **Why "Removal of foreign bodies" is the correct answer:** While a flexible bronchoscope can occasionally be used to retrieve small, distal foreign bodies using specialized baskets, it is **not designed** for this purpose. The gold standard for foreign body removal is **Rigid Bronchoscopy**. Rigid bronchoscopes have a wide, hollow bore that allows for the passage of large grasping forceps and provides a secure airway to protect the vocal cords during the extraction of sharp or bulky objects. **Analysis of other options:** * **Ventilation:** Modern flexible bronchoscopes can be passed through an endotracheal tube or laryngeal mask airway (LMA), allowing for continuous ventilation during the procedure. * **Drainage of secretions:** One of the primary therapeutic uses of flexible bronchoscopy is "pulmonary toilet"—the suctioning of thick mucus plugs or secretions in collapsed lung segments. * **Performing biopsy:** Flexible bronchoscopes have small working channels (typically 2.0–2.8 mm) designed specifically for cytology brushes and transbronchial needle aspiration (TBNA) to sample peripheral or central lesions. **High-Yield Clinical Pearls for NEET-PG:** * **Rigid Bronchoscopy:** Preferred for massive hemoptysis (better suctioning), foreign body removal, and pediatric airway emergencies. * **Flexible Bronchoscopy:** Preferred for diagnostic visualization of the bronchial tree, peripheral lung biopsies, and difficult intubations. * **Anesthesia:** Flexible bronchoscopy is usually performed under local anesthesia/conscious sedation, whereas rigid bronchoscopy requires general anesthesia.

Q: Which of the following complications is likely to result after several units of blood have been transfused?

Metabolic alkalosis. Explanation: The correct answer is **Metabolic Alkalosis**. **Why it is correct:** Stored blood contains **sodium citrate** as an anticoagulant. When a patient receives a massive blood transfusion (typically defined as >10 units in 24 hours or >4 units in 1 hour), the liver metabolizes the citrate into **bicarbonate** ($HCO_3^-$). The accumulation of bicarbonate in the bloodstream leads to an increase in blood pH, resulting in metabolic alkalosis. This is a classic "post-transfusion" metabolic derangement. **Why other options are incorrect:** * **Metabolic Acidosis:** While stored blood is slightly acidic due to the accumulation of lactic acid and pyruvic acid during storage, the body’s metabolic conversion of citrate to bicarbonate usually overrides this, leading to alkalosis rather than acidosis in the post-transfusion period. * **Respiratory Alkalosis/Acidosis:** These conditions are primarily driven by changes in $CO_2$ levels due to ventilation abnormalities (hyperventilation or hypoventilation). Blood transfusion does not directly alter the respiratory drive or $CO_2$ exchange in a way that consistently produces these states. **High-Yield Clinical Pearls for NEET-PG:** * **Citrate Toxicity:** Citrate not only causes alkalosis but also binds to ionized calcium, leading to **Hypocalcemia**. Look for signs like Tetany or QTc prolongation on ECG. * **Hyperkalemia:** Stored RBCs leak potassium over time. Massive transfusion can lead to transient hyperkalemia, especially in patients with renal failure. * **Hypothermia:** Rapid infusion of cold blood can lead to cardiac arrhythmias. * **2,3-DPG Deficiency:** Stored blood has low 2,3-DPG, which shifts the Oxygen-Dissociation Curve to the **Left**, meaning hemoglobin holds onto oxygen more tightly, potentially reducing tissue oxygenation.

Q: Reactionary hemorrhage occurs within which time frame?

24 hours. **Explanation:** Hemorrhage is classified into three types based on the timing of the bleed relative to the surgical procedure or injury. Understanding these timelines is crucial for NEET-PG. **1. Why "24 hours" is correct:** **Reactionary hemorrhage** occurs within **24 hours** of surgery (typically between 4–6 hours). It is caused by the "reaction" of the body as it recovers from the immediate physiological stress of surgery. As the patient’s blood pressure rises back to normal levels (following the recovery from anesthetic shock or fluid resuscitation) or as vasodilation occurs, small vessels that were not bleeding during the hypotensive state begin to bleed. A common cause is a slipped ligature or a dislodged clot. **2. Why the other options are incorrect:** * **B, C, and D (1–6 days):** These timeframes are incorrect for reactionary hemorrhage. Bleeding that occurs after 24 hours (typically between **7–14 days**) is classified as **Secondary hemorrhage**. This is usually caused by **infection** or tissue sloughing that erodes a vessel wall. **Clinical Pearls & High-Yield Facts:** * **Primary Hemorrhage:** Occurs at the time of operation or injury (e.g., an inadequately tied vessel). * **Reactionary Hemorrhage (The "Recovery" Bleed):** Key triggers include recovery from anesthesia, coughing, vomiting, or over-vigorous fluid resuscitation raising the BP. * **Secondary Hemorrhage (The "Infection" Bleed):** Always suspect a local wound infection or pressure necrosis (e.g., from a drain) if bleeding occurs a week after surgery. * **Management:** Reactionary hemorrhage often requires a return to the operating theater to identify and ligate the bleeding vessel.

Q: Which of the following statements is true about hernias?

All of the above.. This question tests fundamental knowledge regarding the classification, pathophysiology, and complications of abdominal wall hernias. **Explanation of Options:** * **Option A (External abdominal hernias are common):** External hernias (where the sac protrudes through a defect in the abdominal wall, e.g., inguinal, femoral, umbilical) are among the most frequent surgical presentations. Inguinal hernias alone have a lifetime risk of approximately 27% in men. * **Option B (Direct hernias are usually acquired):** Unlike indirect hernias, which result from a congenital patent processus vaginalis, direct inguinal hernias are acquired. They occur due to weakness in the fascia of the posterior wall of the inguinal canal (Hesselbach’s triangle), often precipitated by chronic increases in intra-abdominal pressure (e.g., chronic cough, straining, or heavy lifting) in older age. * **Option C (Strangulation is common in femoral hernias):** Femoral hernias have the highest risk of strangulation (approx. 20-40%) among all hernias. This is due to the rigid, narrow boundaries of the femoral canal (specifically the lacunar ligament), which easily constricts the neck of the hernia sac. Since all three statements are clinically accurate, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Most common hernia overall:** Indirect Inguinal Hernia (in both males and females). * **Most common hernia in females:** Indirect Inguinal Hernia (though femoral hernias are more common in females than in males). * **Richter’s Hernia:** Only part of the bowel wall is trapped; it can strangulate without causing complete intestinal obstruction. * **Maydl’s Hernia:** "Hernia-in-W" where the loop of bowel inside the abdomen becomes gangrenous. * **Surgery of Choice:** Lichtenstein tension-free mesh repair is the gold standard for inguinal hernias.

Q: Cock’s peculiar tumour is described as:

An infected sebaceous cyst. **Explanation:** **Cock’s Peculiar Tumour** is a classic surgical misnomer. It is not a true neoplasm, but rather an **infected, proliferating sebaceous cyst**, typically occurring on the scalp. 1. **Why Option A is Correct:** When a sebaceous cyst on the scalp becomes infected and ulcerates, the lining of the cyst (sebaceous epithelium) undergoes exuberant proliferation. This results in a fungating, granulomatous mass that resembles a squamous cell carcinoma (SCC). Despite its alarming, "tumour-like" appearance, it is benign and originates from a simple sebaceous cyst. 2. **Why Other Options are Incorrect:** * **Options B, C, and D:** While Cock’s peculiar tumour occurs on the scalp and may appear to involve the bone due to its size and fixation, it is strictly a lesion of the skin and subcutaneous tissue. It does not arise from the bone (osteomyelitis) or the diploe of the skull. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Appearance:** It presents as a foul-smelling, vascular, and ulcerated mass on the scalp. * **Differential Diagnosis:** Its primary differential is **Squamous Cell Carcinoma (SCC)**. It is distinguished from SCC by the absence of induration at the base and the absence of regional lymphadenopathy. * **Management:** Wide local excision is the treatment of choice. * **Key Feature:** It is a "proliferating trichilemmal cyst" in modern pathological terms. * **Memory Aid:** "Cock’s" = Scalp; "Peculiar" = Looks like cancer but is actually an infected cyst.

Q: All of the following are true about sportsman's hernia except:

Sac is palpable. **Explanation:** **Sportsman’s Hernia** (also known as Gilmore’s Groin or Athletic Pubalgia) is a clinical syndrome characterized by chronic groin pain. Despite the name, it is **not a true hernia** because there is no actual defect in the abdominal wall and no protrusion of a peritoneal sac. 1. **Why Option B is correct:** Since there is no actual herniation of intra-abdominal contents, there is **no palpable sac**. The condition involves a tear or strain of the soft tissues (muscles, tendons, or ligaments) in the groin area, specifically the posterior inguinal wall or the insertion of the rectus abdominis. 2. **Why Option A is incorrect:** Inguinal pain is the hallmark symptom. It is typically unilateral, exercise-induced, and aggravated by sudden movements like kicking, twisting, or sprinting. 3. **Why Option C is incorrect:** **MRI** is the Investigation of Choice (IOC) as it can identify bone marrow edema in the pubic symphysis, muscle tears (adductor longus or rectus abdominis), and help rule out other causes of groin pain. 4. **Why Option D is incorrect:** If conservative management (rest and physiotherapy) fails, surgical intervention is indicated. Both open and **laparoscopic inguinal hernia repairs** (using mesh to reinforce the posterior wall) are standard treatments to stabilize the groin. **Clinical Pearls for NEET-PG:** * **Pathophysiology:** Often involves a "tug-of-war" imbalance between the strong adductor muscles and weak abdominal muscles. * **Physical Exam:** Pain is often elicited by resisted adduction or a resisted sit-up. * **Differential Diagnosis:** Must be distinguished from Osteitis Pubis (inflammation of the pubic symphysis).

Q: In a given case if the skin over a swelling is fixed to the swelling, which of the following is NOT a differential diagnosis?

Lipoma. In clinical surgery, the relationship between a swelling and the overlying skin is a critical diagnostic feature. **Why Lipoma is the Correct Answer:** A **Lipoma** is a benign tumor of adipose tissue located in the subcutaneous plane. A characteristic feature of a lipoma is that it is **not fixed to the skin**. On examination, the skin can be easily moved over the swelling. Furthermore, when the skin is pinched over a lipoma, it often exhibits "dimpling" or "puckering" (the **Slip Sign**), but the tumor itself remains mobile relative to the dermis. **Analysis of Incorrect Options:** * **Sebaceous Cyst:** These arise from the hair follicle and are located within the dermis. The hallmark clinical sign is a **punctum**, which represents the opening of the sebaceous duct. Because it is intradermal, the skin is inherently fixed to the cyst. * **Papilloma:** This is a benign epithelial tumor growing outward from the skin surface. Since it originates from the skin layers, it is by definition attached to/part of the skin. * **Epithelioma (Squamous Cell Carcinoma):** This is a malignant tumor of the epithelial cells. Malignancies of the skin or those invading the skin from deeper structures cause fixation due to infiltration and desmoplastic reactions. **High-Yield Clinical Pearls for NEET-PG:** * **Slip Sign:** Pathognomonic for Lipoma. As you gently press the edge of the swelling, it slips away from the finger. * **Punctum:** Pathognomonic for Sebaceous Cyst (Epidermoid cyst). * **Dermoid Cyst:** Unlike sebaceous cysts, these are located deep to the skin (subcutaneous) and do **not** have a punctum or skin fixation. * **Fixity to deeper structures:** Tested by contracting the underlying muscle (e.g., Pectoralis major for breast lumps). If the lump becomes less mobile upon muscle contraction, it is fixed to the muscle/fascia.

Q: Spring water cyst is another name for which of the following?

Pleuropericardial cyst. ### Explanation **Correct Answer: C. Pleuropericardial cyst** **Why it is correct:** A **Pleuropericardial cyst** (also known as a pericardial cyst) is a benign, congenital malformation resulting from the failure of the primitive pleuropericardial lacunae to fuse. These cysts are typically filled with a clear, straw-colored, or water-like fluid, which gives them the classic descriptive name **"Spring water cyst."** On imaging, they are most commonly located at the **right cardiophrenic angle** (70% of cases), followed by the left cardiophrenic angle. **Why the other options are incorrect:** * **A. Hydatid cyst of lung:** Caused by *Echinococcus granulosus*, these are characterized by signs like the "Water lily sign" (Casoni’s test is historical). They contain "hydatid sand" rather than simple spring water fluid. * **B. Lung amoebic cyst:** These are usually complications of hepatic amoebiasis (Entamoeba histolytica) rupturing through the diaphragm. They are characterized by **"Anchovy sauce"** sputum/pus, not clear fluid. * **D. Enterogenous cyst:** These are posterior mediastinal masses derived from the primitive foregut. They are often associated with vertebral anomalies and contain mucoid material, not clear "spring water." **High-Yield Pearls for NEET-PG:** * **Most common location:** Right cardiophrenic angle. * **Clinical presentation:** Usually asymptomatic and discovered incidentally on a chest X-ray. * **Differential Diagnosis of Anterior Mediastinal Mass (The 4 Ts):** Thymoma, Teratoma, Thyroid (Retrosternal Goiter), and "Terrible" Lymphoma. Note that pericardial cysts are technically located in the **middle mediastinum** (specifically the anterior-inferior portion). * **Management:** Observation if asymptomatic; surgical excision or percutaneous aspiration if symptomatic (causing chest pain or arrhythmias).

Question 1

Surgical approaches for open thymectomy include all except?

Accepted Answer

Thoracoabdominal incision

Answer

Transcervical thymectomy

Answer

Median sternotomy

Answer

Partial median sternotomy

Question 2

Which suture material is least adherent to tissue and possesses plasticity?

Accepted Answer

Prolene

Answer

Nylon

Answer

PDS

Answer

Silk

Question 3

A flexible bronchoscope is designed for all of the following functions EXCEPT?

Accepted Answer

Removal of foreign bodies

Answer

Ventilation

Answer

Drainage of secretions

Answer

Performing biopsy

Question 4

Which of the following complications is likely to result after several units of blood have been transfused?

Accepted Answer

Metabolic alkalosis

Answer

Metabolic acidosis

Answer

Respiratory alkalosis

Answer

Respiratory acidosis

Question 5

Reactionary hemorrhage occurs within which time frame?

Accepted Answer

24 hours

Answer

1-2 days

Answer

2-4 days

Answer

4-6 days

Question 6

Which of the following statements is true about hernias?

Accepted Answer

All of the above.

Answer

External abdominal hernias are common.

Answer

Direct hernias are usually acquired.

Answer

Strangulation is common in femoral hernias.

Question 7

Cock’s peculiar tumour is described as:

Accepted Answer

An infected sebaceous cyst

Answer

Osteomyelitis of the skull

Answer

A cyst in the skull

Answer

A tumour of the skull

Question 8

All of the following are true about sportsman's hernia except:

Accepted Answer

Sac is palpable

Answer

Has inguinal pain

Answer

IOC is MRI

Answer

Laparoscopic inguinal hernia surgery

Question 9

In a given case if the skin over a swelling is fixed to the swelling, which of the following is NOT a differential diagnosis?

Accepted Answer

Lipoma

Answer

Sebaceous cyst

Answer

Papilloma

Answer

Epithelioma

Question 10

Spring water cyst is another name for which of the following?

Accepted Answer

Pleuropericardial cyst

Answer

Hydatid cyst of lung

Answer

Lung amoebic cyst

Answer

Enterogenous cyst

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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