General Surgery Principles Practice Questions

Q: All of the following are causes of pneumoperitoneum except?

Hirschsprung's disease. **Explanation:** **Pneumoperitoneum** refers to the presence of free air within the peritoneal cavity, most commonly caused by the perforation of a hollow viscus. **Why Hirschsprung’s Disease is the correct answer:** Hirschsprung’s disease is a functional bowel obstruction caused by the absence of ganglion cells in the distal colon. While it leads to massive bowel dilatation (**megacolon**), the bowel wall typically remains intact. Therefore, it presents with **pneumatosis intestinalis** (air within the bowel wall) or massive distension, but not pneumoperitoneum, unless a secondary complication like enterocolitis leads to a perforation (which is rare compared to the primary pathology). **Analysis of Incorrect Options:** * **Perforated Peptic Ulcer:** This is the **most common cause** of spontaneous pneumoperitoneum. Gastric or duodenal contents and air escape into the peritoneal cavity. * **Laparoscopic Procedure:** This is a cause of **iatrogenic pneumoperitoneum**. Carbon dioxide (CO2) is intentionally insufflated into the abdomen to create a working space. Residual air can persist for several days post-surgery. * **Perforated Appendix:** While less common than peptic ulcers (due to the appendix often being walled off by the omentum), a free perforation of the appendix can release intraluminal gas into the peritoneum. **NEET-PG High-Yield Pearls:** * **Most sensitive sign:** Air under the right diaphragm on an erect X-ray chest (can detect as little as 1–2 ml of air). * **Left Lateral Decubitus View:** The preferred position if the patient cannot stand; air is seen over the liver shadow. * **Rigler’s Sign:** Seeing both sides of the bowel wall due to free intraperitoneal air. * **Football Sign:** A large radiolucency outlining the entire peritoneal cavity in massive pneumoperitoneum (common in neonates).

Q: Hyperacute rejection is due to which of the following mechanisms?

Preformed antibodies. **Explanation:** **Hyperacute Rejection** is an immediate, irreversible immunological reaction occurring within minutes to hours after organ transplantation. **1. Why Option A is Correct:** The mechanism is a **Type II Hypersensitivity reaction**. It is mediated by **preformed circulating antibodies** (IgG) in the recipient’s blood. These antibodies are directed against donor antigens (typically ABO blood group antigens or HLA Class I antigens). Upon reperfusion, these antibodies bind to the donor vascular endothelium, activating the **complement system**. This leads to rapid endothelial damage, platelet aggregation, and diffuse intravascular thrombosis, resulting in the "blue graft" appearance and graft necrosis. **2. Why Other Options are Incorrect:** * **Option B:** Cytotoxic T lymphocyte (CD8+) mediated injury is the hallmark of **Acute Cellular Rejection**, which typically occurs days to weeks after transplant. * **Option C:** Endothelitis (inflammation of the vessel wall) is a feature of **Acute Antibody-Mediated Rejection**, but it is caused by *recipient* antibodies against donor tissue, not donor antibodies. * **Option D:** Macrophages play a role in chronic inflammation and delayed-type hypersensitivity but are not the primary mediators of the rapid vascular collapse seen in hyperacute rejection. **3. High-Yield Clinical Pearls for NEET-PG:** * **Prevention:** Hyperacute rejection is prevented by **Cross-matching** (mixing recipient serum with donor lymphocytes) and ABO compatibility testing. * **Treatment:** There is no effective treatment once it starts; the graft must be **surgically removed**. * **Risk Factors:** Previous blood transfusions, multiple pregnancies, or prior organ transplants (all of which sensitize the recipient). * **Pathology:** Characterized by **Fibrinoid necrosis** of capillaries and "starry sky" appearance due to neutrophilic infiltration.

Q: Bochdalek hernia occurs through which anatomical structure?

Diaphragm. **Explanation:** **Bochdalek hernia** is the most common type of **Congenital Diaphragmatic Hernia (CDH)**, accounting for approximately 85-90% of cases. It occurs due to the failure of the **pleuroperitoneal membrane** to fuse with the septum transversum and dorsal mesentery of the esophagus during embryonic development (usually between the 8th and 10th week). This results in a posterolateral defect in the **diaphragm**, most commonly on the **left side** (80-85%), allowing abdominal viscera to herniate into the thoracic cavity. **Analysis of Incorrect Options:** * **B. Lumbar triangle:** Hernias through the superior lumbar triangle (Grynfeltt-Lesshaft) or inferior lumbar triangle (Petit) are types of lumbar hernias, not diaphragmatic. * **C. Femoral region:** This is the site for femoral hernias, which occur through the femoral canal, medial to the femoral vein. * **D. Obturator canal:** This is the site for obturator hernias, which typically present with the Howship-Romberg sign (pain in the medial thigh). **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic:** **B**ochdalek is **B**ack and **B**ad (Posterolateral, associated with severe pulmonary hypoplasia). **M**orgagni is **M**edial/Anterior. * **Clinical Triad:** Scaphoid abdomen, respiratory distress, and shifted heart sounds. * **Radiology:** Chest X-ray shows air-filled bowel loops in the hemithorax and a mediastinal shift. * **Management:** Initial stabilization involves **intubation** (avoid bag-mask ventilation to prevent bowel distension) and **nasogastric suction**. Surgery is not an emergency; it is performed after stabilizing pulmonary hypertension.

Q: A 37-year-old woman presents with high fever (39.5°C), nausea, and vomiting. Physical examination reveals increased abdominal pain in the paraumbilical region, rebound tenderness over McBurney's point, and a positive psoas sign. Blood tests show marked leukocytosis. What is the most likely diagnosis?

Appendicitis. ### Explanation **Correct Answer: B. Appendicitis** The clinical presentation is a classic textbook case of **Acute Appendicitis**. The diagnosis is primarily clinical, based on the following findings: * **Paraumbilical pain:** This represents visceral pain from the T10 dermatome as the appendix distends. * **McBurney’s Point Tenderness:** As the parietal peritoneum becomes inflamed, the pain localizes to the Right Iliac Fossa (RIF). * **Psoas Sign:** Pain on extension of the right hip indicates an inflamed appendix in a **retrocecal** position, irritating the iliopsoas muscle. * **Systemic Signs:** High fever, nausea, vomiting, and marked leukocytosis (left shift) are indicative of an acute inflammatory/infectious process. **Why Incorrect Options are Wrong:** * **A. Ectopic Pregnancy:** While it causes RIF pain, it is usually associated with amenorrhea, vaginal bleeding, and hemodynamic instability if ruptured. Fever and high leukocytosis are less common unless there is secondary infection. * **C. Cholecystitis:** Pain is typically localized in the **Right Upper Quadrant (RUQ)** and radiates to the right scapula (Boas' sign). Murphy’s sign would be positive, not McBurney’s. * **D. Nephrolithiasis:** Presents as "loin to groin" colicky pain. While it causes nausea, it rarely presents with high fever or rebound tenderness unless complicated by pyelonephritis. **High-Yield Clinical Pearls for NEET-PG:** * **Alvarado Score (MANTRELS):** A score ≥7 is highly suggestive of appendicitis. * **Most common position:** Retrocecal (75%), followed by Pelvic (20%). * **Rovsing’s Sign:** Pain in the RIF when the Left Iliac Fossa is palpated. * **Investigation of Choice:** Contrast-Enhanced CT (CECT) is the gold standard in adults; Ultrasound is preferred in children and pregnant women.

Q: Splenectomy is done to tide over the acute crises of uncontrollable:

ITP. **Explanation:** **1. Why ITP is the Correct Answer:** Immune Thrombocytopenic Purpura (ITP) is an autoimmune condition where IgG autoantibodies coat platelets, leading to their premature destruction by splenic macrophages. In **acute, life-threatening crises** (such as intracranial or gastrointestinal hemorrhage) where medical management (steroids, IVIG, or platelet transfusions) fails to stabilize the patient, an **emergency splenectomy** is performed. Removing the spleen eliminates both the primary site of platelet destruction and a major source of autoantibody production, leading to a rapid rise in platelet counts. **2. Why Other Options are Incorrect:** * **TTP (Thrombotic Thrombocytopenic Purpura):** The pathophysiology involves a deficiency of the ADAMTS13 enzyme, leading to microthrombi. The primary treatment is **Plasmapheresis (Plasma Exchange)**. Splenectomy is not indicated for acute crises and is rarely considered even in refractory cases. * **HUS (Hemolytic Uremic Syndrome):** This is primarily a triad of microangiopathic hemolytic anemia, thrombocytopenia, and acute kidney injury (often Shiga-toxin mediated). Treatment is supportive (dialysis, fluids); splenectomy has no role in its management. **3. Clinical Pearls for NEET-PG:** * **Indications for Splenectomy in ITP:** Failure of medical therapy (steroids are 1st line), contraindications to steroids, or emergency life-threatening bleeding. * **Vaccination Protocol:** For elective splenectomy, vaccinate **2 weeks before** surgery. For emergency splenectomy (like in acute ITP crisis), vaccinate **2 weeks after** surgery. * **Target Organisms:** *S. pneumoniae* (most common), *H. influenzae*, and *N. meningitidis*. * **Post-Splenectomy Blood Picture:** Look for **Howell-Jolly bodies** (most characteristic), Pappenheimer bodies, Heinz bodies, and target cells.

Q: What is true about a femoral hernia?

Pregnancy is a common cause. **Explanation:** **Why Option B is Correct:** Femoral hernias occur through the femoral canal, which is bounded medially by the lacunar ligament and laterally by the femoral vein. While femoral hernias are more common in females overall (due to a wider pelvis), the most significant physiological factor contributing to their development is **increased intra-abdominal pressure**. Pregnancy is a classic cause as it leads to both increased pressure and hormonal changes that relax pelvic ligaments, widening the femoral ring and predisposed the patient to herniation. **Analysis of Incorrect Options:** * **Option A:** While femoral hernias are more common in women (Female:Male ratio is approx. 4:1), they do **not** occur exclusively in females. In fact, the most common hernia in both sexes remains the indirect inguinal hernia. * **Option C:** Femoral hernias have the **highest risk of strangulation** (approx. 20-40%) among all abdominal wall hernias. This is because the femoral ring is narrow and rigid, particularly due to the sharp edge of the lacunar ligament. * **Option D:** There is no clinical association between femoral hernias and cryptorchidism (undescended testes). Cryptorchidism is more relevant to the development of indirect inguinal hernias due to a patent processus vaginalis. **NEET-PG High-Yield Pearls:** * **Position:** A femoral hernia is felt **below and lateral** to the pubic tubercle (Inguinal hernias are above and medial). * **Laugier’s Hernia:** A rare variant of femoral hernia through the lacunar ligament. * **Cloquet’s Node:** A lymph node located within the femoral canal that can mimic a strangulated femoral hernia (De Garengeot's hernia is when the appendix is in the sac). * **Management:** Because of the high risk of strangulation, all femoral hernias should be repaired surgically (e.g., McVay repair or pre-peritoneal mesh).

Q: What is the name of this retractor?

Deaver. ***Deaver*** - Features a **wide, curved, flat blade** that is ideal for **deep abdominal and pelvic retraction** during major surgeries. - The **curved design** allows for effective retraction of large organs like the **liver** and **bowel loops** without causing trauma. *Langenbeck* - Has a **right-angled hook tip** at the end, making it suitable for **superficial retraction** of skin and fascia. - Commonly used in **orthopedic** and **plastic surgery** procedures, not for deep abdominal work. *Czerny* - A **double-ended retractor** with different blade sizes on each end, used for **moderate depth retraction**. - Less effective for **deep pelvic** or **abdominal cavity** retraction compared to the Deaver. *Thomson* - A **ring or frame-type retractor** with **self-retaining mechanism** using ratcheted arms. - Designed for **wound edge retraction** in **superficial surgeries**, not for organ retraction in deep cavities.

Q: A 60-year-old female presents with a tender, irreducible mass immediately below and lateral to the pubic tubercle. Plain abdominal X-ray shows intestinal obstruction. What is the most likely diagnosis?

Strangulated femoral hernia. ### Explanation **1. Why the Correct Answer is Right:** The diagnosis is based on the anatomical location of the mass. A **femoral hernia** typically presents as a lump **below and lateral to the pubic tubercle**, passing through the femoral canal. This is in contrast to an inguinal hernia, which is found above and medial to the pubic tubercle. Femoral hernias have a very high risk of **strangulation** (up to 40%) because the femoral ring is narrow and rigid (bounded by the lacunar ligament). The patient’s presentation—a tender, irreducible mass combined with clinical signs of intestinal obstruction (vomiting, distension, and X-ray findings)—is a classic "textbook" description of a strangulated femoral hernia. **2. Why the Incorrect Options are Wrong:** * **Small bowel carcinoma:** While it can cause obstruction, it would not present as a tender, palpable mass in the groin. * **Adhesions:** This is the most common cause of small bowel obstruction overall, but it does not explain the presence of a localized, irreducible groin mass. * **Strangulated inguinal hernia:** An inguinal hernia emerges **above and medial** to the pubic tubercle. While it is a common cause of obstruction, the specific anatomical description provided points definitively to the femoral canal. **3. NEET-PG High-Yield Pearls:** * **Demographics:** Femoral hernias are more common in **females** (due to a wider pelvis), though inguinal hernias remain the most common hernia type in both sexes. * **Anatomy:** The femoral canal is bounded medially by the **Lacunar (Gimbernat’s) ligament**, which is often the site of constriction in strangulation. * **Management:** Because of the high risk of strangulation, all femoral hernias should be repaired surgically upon diagnosis. * **Differential:** A "Cloquet’s node" (enlarged lymph node in the femoral canal) can mimic a femoral hernia but usually does not cause bowel obstruction.

Q: Purulent inflammation and infection of the terminal pulp space of the distal phalanges is known as:

Whitlow. **Explanation:** The correct answer is **Whitlow** (specifically **Felon**). A felon is a closed-space infection of the terminal pulp space of the finger. The anatomy of the distal phalanx is unique because it contains numerous vertical fibrous septa that connect the skin to the periosteum, creating small, non-compliant compartments. When infection occurs here, the resulting inflammatory edema leads to a rapid rise in pressure, causing intense "throbbing" pain and potential necrosis of the distal phalanx (osteomyelitis) due to compression of the digital arteries. **Analysis of Incorrect Options:** * **Acute Paronychia:** This is an infection of the soft tissues surrounding the nail fold (cuticle). It is the most common hand infection but does not involve the deep pulp space. * **Acute Suppurative Tenosynovitis:** This involves infection within the flexor tendon sheath. It is characterized by **Kanavel’s signs** (flexed posture, fusiform swelling, tenderness over the sheath, and pain on passive extension). * **Apical Subungual Infection:** This refers to a localized collection of pus beneath the distal edge of the nail plate, often following a splinter injury, rather than an infection of the entire pulp space. **Clinical Pearls for NEET-PG:** * **Most common organism:** *Staphylococcus aureus*. * **Clinical Feature:** Severe, throbbing pain is the hallmark. * **Management:** Early incision and drainage are crucial. The incision should be longitudinal (mid-lateral or central) to avoid damaging the digital nerves and to divide the fibrous septa. * **Complication:** If untreated, it can lead to **ischemic necrosis** of the diaphysis of the distal phalanx (the epiphysis is usually spared as its blood supply arises proximal to the pulp space).

Question 1

All of the following are causes of pneumoperitoneum except?

Accepted Answer

Hirschsprung's disease

Answer

Perforated peptic ulcer

Answer

Laparoscopic procedure

Answer

Perforated appendix

Question 2

Hyperacute rejection is due to which of the following mechanisms?

Accepted Answer

Preformed antibodies

Answer

Cytotoxic T lymphocyte mediated injury

Answer

Endothelitis caused by donor antibodies

Answer

Circulating macrophage mediated injury

Question 3

Bochdalek hernia occurs through which anatomical structure?

Accepted Answer

Diaphragm

Answer

Lumbar triangle

Answer

Femoral region

Answer

Obturator canal

Question 4

A 37-year-old woman presents with high fever (39.5°C), nausea, and vomiting. Physical examination reveals increased abdominal pain in the paraumbilical region, rebound tenderness over McBurney's point, and a positive psoas sign. Blood tests show marked leukocytosis. What is the most likely diagnosis?

Accepted Answer

Appendicitis

Answer

Ectopic pregnancy

Answer

Cholecystitis

Answer

Nephrolithiasis

Question 5

Splenectomy is done to tide over the acute crises of uncontrollable:

Accepted Answer

ITP

Answer

TTP

Answer

HUS

Answer

All of the above

Question 6

What is true about a femoral hernia?

Accepted Answer

Pregnancy is a common cause

Answer

Occurs exclusively in females

Answer

Does not strangulate

Answer

In males, it is associated with cryptorchidism

Question 7

What is the name of this retractor?

Accepted Answer

Deaver

Answer

Langenbeck

Answer

Czerny

Answer

Thomson

Question 8

A 60-year-old female presents with a tender, irreducible mass immediately below and lateral to the pubic tubercle. Plain abdominal X-ray shows intestinal obstruction. What is the most likely diagnosis?

Accepted Answer

Strangulated femoral hernia

Answer

Small bowel carcinoma

Answer

Adhesions

Answer

Strangulated inguinal hernia

Question 9

Purulent inflammation and infection of the terminal pulp space of the distal phalanges is known as:

Accepted Answer

Whitlow

Answer

Acute paronychium

Answer

Acute suppurative tenosynovitis

Answer

Apical subungual infection

Question 10

What is a Marjolin ulcer?

Accepted Answer

Squamous cell carcinoma arising in a chronic ulcer or burn scar.

Answer

A complication of chronic venous insufficiency.

Answer

Basal cell carcinoma arising in a chronic ulcer or burn scar.

Answer

A malignant tumor that arises from the base of any ulcer.

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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