General Surgery Principles Practice Questions

Q: Which of the following describes Richter's hernia?

Involves only a portion of the circumference of the bowel.. ### Explanation **Richter’s Hernia** is a specific type of hernia where only a **portion of the circumference** of the bowel wall (usually the antimesenteric border) becomes trapped and strangulated within the hernial sac. #### Why the Correct Answer is Right: In Richter's hernia, the lumen of the bowel remains partially patent because the entire circumference is not involved. This is clinically significant because the patient may **not** present with typical signs of intestinal obstruction (like vomiting or absolute constipation), leading to a dangerous delay in diagnosis and subsequent gangrene or perforation. #### Analysis of Incorrect Options: * **Option A (Maydl’s Hernia):** This describes a "W-shaped" hernia where two loops of bowel are in the sac, but the intervening loop (the "central part of the W") remains inside the abdomen and undergoes strangulation. * **Option B (Spigelian Hernia):** This occurs through the Spigelian fascia, typically at or below the level of the **arcuate line**, at the lateral border of the rectus abdominis. * **Option D (Epigastric Hernia):** This refers to a protrusion of extraperitoneal fat (and sometimes a peritoneal sac) through a defect in the **linea alba**, anywhere between the xiphoid process and the umbilicus. #### NEET-PG High-Yield Pearls: * **Common Sites:** Most frequently occurs at the **femoral ring**, followed by the inguinal ring and obturator canal. * **Clinical Trap:** Because there is no complete obstruction, the hernia is often small and easily missed during physical examination. * **Complication:** It carries a high risk of **spontaneous perforation** into the peritoneal cavity or the formation of a fecal fistula if the gangrenous portion sloughs off. * **Key Distinction:** Unlike Littre’s hernia (which involves Meckel’s diverticulum), Richter’s involves the wall of the small intestine (usually ileum).

Q: Which of the following materials used for implants evokes the least inflammatory tissue response?

Polypropylene. **Explanation:** The degree of tissue reaction to an implant or suture material depends on its chemical composition and physical structure. **Polypropylene** is a synthetic, non-absorbable monofilament polymer. Because it is chemically inert and has a smooth, non-porous surface, it evokes the **least inflammatory tissue response** among the options provided. Its monofilament nature also prevents "wicking" of bacteria, making it ideal for use in contaminated fields and for vascular anastomoses. **Analysis of Incorrect Options:** * **Bovine Collagen:** Being a natural protein derived from animals, it is highly immunogenic. It triggers a significant inflammatory response as the body recognizes it as foreign protein and eventually degrades it via enzymatic digestion. * **Polyglactin (Vicryl):** This is a synthetic absorbable braided suture. While it is more inert than natural materials, it is designed to be broken down by hydrolysis. This process, along with its braided structure, induces a moderate inflammatory reaction compared to polypropylene. * **Cotton:** As a natural cellulose-based fiber, cotton evokes a robust inflammatory response. Its multifilament (twisted) structure provides a large surface area for cellular attachment and can harbor bacteria, leading to significant tissue reaction and potential granuloma formation. **High-Yield Clinical Pearls for NEET-PG:** * **Least Reactive:** Polypropylene and Stainless Steel. * **Most Reactive:** Natural materials like Silk and Catgut. * **Suture of Choice:** Polypropylene is the gold standard for **vascular surgery** and **hernia repair (mesh)** due to its high tensile strength and minimal reactivity. * **Absorption Mechanism:** Synthetic sutures (e.g., Polyglactin) are absorbed by **hydrolysis**, whereas natural sutures (e.g., Catgut) are absorbed by **proteolysis/enzymatic digestion**.

Q: What is the most common primary source of brain metastases?

Lung. **Explanation:** Brain metastases are the most common intracranial tumors in adults, occurring much more frequently than primary brain malignancies. **Why Lung is Correct:** **Lung cancer** is the most common primary source, accounting for approximately **40–50%** of all brain metastases. This is due to the high incidence of lung cancer and its unique hematogenous spread pattern; cancer cells entering the pulmonary circulation gain direct access to the systemic arterial circulation, allowing them to bypass the "filter" of the lungs and seed directly into the brain. Small cell lung cancer (SCLC) has a particularly high propensity for early CNS involvement. **Analysis of Incorrect Options:** * **Breast Cancer (Option C):** This is the **second most common** source (approx. 15–25%). It is more common in younger women and specifically associated with HER2-positive and Triple-Negative subtypes. * **Melanoma (Option D):** While melanoma has the **highest propensity** (percentage risk per individual case) to spread to the brain, it is less common overall than lung or breast cancer due to its lower general incidence. * **Liver (Option B):** Primary Hepatocellular Carcinoma (HCC) rarely metastasizes to the brain; it more commonly spreads to the lungs or bone. **NEET-PG High-Yield Pearls:** 1. **Most common source overall:** Lung > Breast > Melanoma > Renal > GI. 2. **Highest propensity to bleed:** Melanoma, Choriocarcinoma, Renal Cell Carcinoma (RCC), and Thyroid cancer. 3. **Location:** Most brain metastases (80%) occur in the cerebral hemispheres, typically at the **grey-white matter junction** where narrowing vessel diameters trap tumor emboli. 4. **Multiplicity:** Lung cancer and melanoma usually present with multiple lesions, whereas Breast, RCC, and Colon cancer often present as a solitary metastasis.

Q: What is the most common mediastinal tumor?

Neurogenic tumor. **Explanation:** The mediastinum is divided into anterior, middle, and posterior compartments. When considering the **entire mediastinum**, **neurogenic tumors** are the most common primary neoplasms (accounting for approximately 20-25% of all cases). These tumors are most frequently located in the **posterior mediastinum**, where they arise from peripheral nerves, sympathetic chains, or paraganglia. **Analysis of Options:** * **A. Neurogenic tumor (Correct):** These are the most common mediastinal masses overall. In adults, they are usually benign (e.g., Schwannoma, Neurofibroma), whereas in children, they are more likely to be malignant (e.g., Neuroblastoma). * **B. Pericardial cyst:** These are the most common cysts of the **middle mediastinum**, but they are far less common than neurogenic tumors overall. * **C. Hernia:** While Morgagni (anterior) and Bochdalek (posterior) hernias can present as mediastinal masses, they are developmental diaphragmatic defects rather than primary tumors. * **D. Teratoma:** These are the most common germ cell tumors of the mediastinum, typically located in the **anterior mediastinum**. While common in that specific compartment, they do not surpass neurogenic tumors in total frequency. **High-Yield Clinical Pearls for NEET-PG:** * **Anterior Mediastinum (The 4 Ts):** Thymoma (most common anterior mass), Teratoma, Thyroid (Retrosternal Goiter), and "Terrible" Lymphoma. * **Middle Mediastinum:** Lymphadenopathy is the most common cause of a mass here; pericardial and bronchogenic cysts are also found. * **Posterior Mediastinum:** Neurogenic tumors are the hallmark of this compartment. * **Rule of Thumb:** If the question asks for the most common mediastinal tumor in **adults**, it is Neurogenic; if it asks for the most common **anterior** mediastinal tumor, it is Thymoma.

Question 1

Which of the following describes Richter's hernia?

Accepted Answer

Involves only a portion of the circumference of the bowel.

Answer

The strangulated loop of 'W' lies within the abdomen

Answer

Hernia occurring at the level of arcuate line

Answer

Hernia occurring through the linea alba

Question 2

Which of the following materials used for implants evokes the least inflammatory tissue response?

Accepted Answer

Polypropylene

Answer

Bovine collagen

Answer

Polygiactin

Answer

Cotton

Question 3

Which of the following is true regarding a flap required for the maxillary tuberosity?

Accepted Answer

Incision is given over the alveolar crest.

Answer

A wedge-shaped incision may be the first tried.

Answer

Incision extends to the bicuspid-cuspid region.

Answer

None of the above.

Question 4

In a splenectomized patient, there is an increased risk of infection by which of the following organisms?

Accepted Answer

Staphylococcus aureus

Answer

Pneumococci

Answer

Klebsiella

Answer

Haemophilus influenzae

Question 5

What is the most common primary source of brain metastases?

Accepted Answer

Lung

Answer

Liver

Answer

Breast

Answer

Melanoma

Question 6

A 43-year-old man presents with severe perineal pain. Examination reveals exquisite tenderness to the right of the anal verge due to a perianal abscess. Rectal examination is refused. What is the next step in management?

Accepted Answer

Drainage of the abscess in the office under local anesthesia.

Answer

Excision of the vertical fold of Morgagni.

Answer

Drainage under general anesthesia and immediate colonoscopy.

Answer

CT scan of the abdomen.

Question 7

Elevators in exodontia primarily work on the principle of which class of lever?

Accepted Answer

Class I lever

Answer

Class I and II levers

Answer

Class III lever

Answer

Wedge

Question 8

A 22-year-old woman underwent tracheostomy during hospitalization following a major motor vehicle accident. Five days post-tracheostomy, she develops minor bleeding around the site. What is the most appropriate immediate management?

Accepted Answer

Perform bronchoscopic evaluation of the trachea at the bedside.

Answer

Remove the tracheostomy at the bedside.

Answer

Exchange the tracheostomy at the bedside.

Answer

Exchange the tracheostomy in the operating room.

Question 9

What is the most common mediastinal tumor?

Accepted Answer

Neurogenic tumor

Answer

Pericardial cyst

Answer

Hernia

Answer

Teratoma

Question 10

Preservation of the ilioinguinal nerve is an important step during which part of an inguinal hernia operation?

Accepted Answer

Incising the external oblique aponeurosis

Answer

Incising the subcutaneous tissue

Answer

Incising the cremasteric fascia

Answer

Isolating the sac

General Surgery Principles — MCQs

General Surgery Principles — MCQs

On this page

Practice by Chapter

Want unlimited practice?