Gastrointestinal Surgery Practice Questions

Q: After splenectomy, the most common infection is:

Streptococcus pneumoniae. ***Streptococcus pneumoniae*** - The **spleen** is crucial for filtering encapsulated bacteria and producing opsonizing antibodies, making individuals **asplenic** or functionally asplenic highly susceptible to infections by **encapsulated organisms**. - *S. pneumoniae* is the most common cause of **overwhelming post-splenectomy infection (OPSI)**, leading to rapid onset **sepsis** and high mortality. *E. coli* - While *E. coli* is a common cause of infections, particularly **gram-negative sepsis** or **urinary tract infections**, it is not an encapsulated bacterium and thus not the primary opportunistic pathogen post-splenectomy. - The spleen's role in clearing *E. coli* is less central compared to encapsulated organisms. *Klebsiella* - *Klebsiella* species are also encapsulated bacteria, but *S. pneumoniae* is statistically the most frequently implicated organism in OPSI. - While *Klebsiella* can cause severe infections, particularly **pneumonia** and **bacteremia**, it is less common than *S. pneumoniae* in the context of post-splenectomy sepsis. *Haemophilus influenzae* - **Encapsulated strains of *Haemophilus influenzae***, particularly type B (Hib), can cause severe infections in asplenic patients, including **meningitis** and **epiglottitis**. - However, with widespread Hib vaccination, its incidence has significantly decreased, and *Streptococcus pneumoniae* remains the most prevalent cause of OPSI.

Q: What is the most common cause of intestinal obstruction?

Adhesions. ***Adhesions*** - **Post-surgical adhesions** are by far the leading cause of **small bowel obstruction** in adults, accounting for approximately 60-80% of cases. - They form as fibrous bands between tissue surfaces after surgery, which can later constrict or twist the bowel. *Ileocaecal tuberculosis* - While it can cause intestinal obstruction due to **stricture formation** and inflammation, it is a much rarer cause, particularly in developed countries. - This condition is more common in immunocompromised individuals or endemic areas. *Carcinoma colon* - **Colorectal cancer** is a common cause of **large bowel obstruction**, but it is less frequent as a cause of overall intestinal obstruction compared to adhesions. - The obstruction typically develops gradually as the tumor grows and narrows the bowel lumen. *Intussusception* - This is a more common cause of intestinal obstruction in **infants and young children**, where one part of the intestine telescopes into another. - In adults, it is a relatively rare cause of obstruction and is often associated with a **lead point** such as a tumor or polyp.

Q: Which of the following is the MOST significant risk factor for inguinal hernia?

Cigarette smoking. ***Cigarette smoking*** - **Cigarette smoking** is strongly associated with an increased risk of inguinal hernia due to the breakdown of connective tissue and increased intra-abdominal pressure from chronic cough. - **Smoking** leads to impaired collagen synthesis and degradation of existing collagen, weakening the abdominal wall and predisposing to hernia formation. *Diabetes mellitus* - While **diabetes mellitus** can affect wound healing and increase the risk of surgical complications, it is not considered a primary direct risk factor for the development of an inguinal hernia itself. - The impact of **diabetes** on connective tissue strength is less direct and significant for hernia formation compared to factors like chronic cough from smoking. *Hypertension* - **Hypertension** is not a direct risk factor for the development of inguinal hernias. - There is no clear physiological mechanism linking elevated blood pressure to the weakening of the abdominal wall. *Hypothyroidism* - **Hypothyroidism** can be associated with an increased risk of certain types of hernias, particularly umbilical hernias, due to generalized weakness of connective tissue. - However, it is not considered the MOST significant risk factor for **inguinal hernias** specifically, which are more influenced by factors affecting intra-abdominal pressure and collagen integrity.

Q: Which type of hernia is commonly associated with hydrocele?

Indirect inguinal hernia. ***Indirect inguinal hernia*** - An **indirect inguinal hernia** occurs when there is a persistent **patent processus vaginalis**, the same embryological structure that can lead to a **hydrocele** if it closes incompletely distally. - Both conditions arise from the failure of the **processus vaginalis** to fully obliterate, allowing abdominal contents (for hernia) or peritoneal fluid (for hydrocele) to enter the inguinal canal or scrotum. *Direct inguinal hernia* - A **direct inguinal hernia** protrudes directly through **Hesselbach's triangle** and is an acquired weakness of the posterior wall of the inguinal canal, not related to the processus vaginalis. - It involves a different anatomical defect and does not share the same developmental origin as a hydrocele. *Femoral hernia* - A **femoral hernia** protrudes through the **femoral canal** below the inguinal ligament, a distinct anatomical pathway from the inguinal canal. - It is more common in women and is not embryologically linked to the formation of a hydrocele. *Umbilical hernia* - An **umbilical hernia** involves a protrusion through the **umbilical ring** due to incomplete closure of the abdominal wall at the umbilicus. - This type of hernia is entirely distinct in its anatomical location and developmental origin from both inguinal hernias and hydroceles.

Q: All are causes of mechanical intestinal obstruction except which of the following?

Mesenteric vascular occlusion. ***Mesenteric vascular occlusion*** - This condition causes **ischemic bowel injury** due to impaired blood flow, leading to **paralytic ileus** rather than a physical blockage. - While it results in intestinal dysfunction, it does not involve a **mechanical obstruction** by a physical barrier. *Gall stones* - Large **gallstones** can erode through the gallbladder wall into the small intestine, leading to a condition called **gallstone ileus**. - This creates a **physical obstruction** within the lumen of the small bowel. *Intussusception* - **Intussusception** involves one segment of the intestine telescoping into an adjacent segment. - This creates a **mechanical blockage** of the intestinal lumen. *Bands* - Internal **fibrous bands** or adhesions, often from previous surgeries, can constrict and obstruct the bowel lumen. - These bands represent a direct **physical impediment** to the passage of intestinal contents.

Q: Which of the following statements regarding indirect inguinal hernia is incorrect?

Always unilateral. ***Always unilateral*** - While indirect inguinal hernias are more frequently unilateral, they can occur **bilaterally** in some patients. - The persistence of a **patent processus vaginalis** on both sides would predispose to bilateral herniation. *Most common type of hernia* - **Indirect inguinal hernias** are indeed the most common type of abdominal wall hernia, accounting for approximately two-thirds of all inguinal hernias. - This is due to their congenital origin from a **patent processus vaginalis**. *Inguinal herniotomy is the basic operation* - For children with indirect inguinal hernias, **inguinal herniotomy** (ligation and excision of the hernia sac) is the standard and often curative procedure. - In adults, a **hernioplasty** (repair with mesh) is usually performed, but simple herniotomy is suitable in specific cases. *Transillumination distinguishes it from hydrocele* - **Hydroceles** typically transilluminate (light passes through), indicating a fluid-filled sac. - An indirect inguinal hernia contains **bowel or omentum**, which does not transilluminate, thus helping to differentiate the two.

Q: What are the potential symptoms of malignant transformation in a retroperitoneal lipoma?

All of the options. ***All of the options*** - Malignant transformation of a lipoma, particularly into a **liposarcoma**, can cause a variety of symptoms due to its growth and potential invasion of surrounding structures. - This includes generalized symptoms like **weight loss**, and localized effects such as **abdominal pain** and **organ compression** (e.g., renal failure). *Abdominal pain* - As a retroperitoneal tumor grows, it can cause **mass effect** and pressure on nearby organs and nerves, leading to abdominal pain. - Pain relief is often sought by patients presenting with these growths, highlighting their clinical significance. *Weight loss* - **Unexplained weight loss** is a common constitutional symptom associated with malignancy, including liposarcoma. - This systemic symptom can indicate a more advanced or aggressive tumor. *Renal failure due to compression* - A growing liposarcoma in the retroperitoneum can **compress structures** such as the ureters, leading to hydronephrosis and ultimately **renal failure**. - Direct invasion or extrinsic compression of the kidney itself can also impair renal function.

Q: The most common complication of Zenker's diverticulum is:

Aspiration pneumonia. ***Aspiration pneumonia*** - **Aspiration pneumonia** is the **most common complication** of Zenker's diverticulum, occurring due to chronic regurgitation of food and secretions that accumulate in the diverticulum. - Patients frequently experience **nocturnal regurgitation** of undigested food, which is then *aspirated* into the airways, leading to recurrent pulmonary infections. - This is the primary reason for surgical intervention in symptomatic patients with Zenker's diverticulum. *Lung abscess* - **Lung abscess** is a more *severe* but **less common** complication that can develop as a consequence of chronic, recurrent aspiration pneumonia. - It represents a localized, necrotizing infection and is a **progression** from untreated or recurrent aspiration, rather than the initial or most frequent complication. *Dysphonia* - While **dysphonia** (hoarseness) can occur due to irritation from regurgitated contents or compression of the recurrent laryngeal nerve, it is **uncommon** as a complication. - Dysphonia is more typically associated with **GERD** or direct laryngeal pathology. *Perforation* - **Perforation** of Zenker's diverticulum is a **rare** complication that may occur spontaneously, due to impacted food, or iatrogenically during endoscopic procedures. - While serious, it is far less common than pulmonary complications from chronic aspiration.

Question 1

After splenectomy, the most common infection is:

Accepted Answer

Streptococcus pneumoniae

Answer

E. coli

Answer

Klebsiella

Answer

Haemophilus influenzae

Question 2

What is the most common cause of intestinal obstruction?

Accepted Answer

Adhesions

Answer

Ileocaecal tuberculosis

Answer

Carcinoma colon

Answer

Intussusception

Question 3

A 45-year-old gentleman has undergone truncal vagotomy and pyloroplasty for bleeding duodenal ulcer seven years ago. Now he has intractable recurrent symptoms of peptic ulcer. All of the following suggest the diagnosis of Zollinger-Ellison syndrome, except:

Accepted Answer

Serum gastrin value of 200 pg/ml with secretin stimulation

Answer

Ulcers in proximal jejunum and lower end of esophagus

Answer

Basal acid output of 15 meq/hour

Answer

Serum gastrin value of 500 pg/ml

Question 4

Which of the following is the MOST significant risk factor for inguinal hernia?

Accepted Answer

Cigarette smoking

Answer

Hypertension

Answer

Diabetes mellitus

Answer

Hypothyroidism

Question 5

Which type of hernia is commonly associated with hydrocele?

Accepted Answer

Indirect inguinal hernia

Answer

Umbilical hernia

Answer

Direct inguinal hernia

Answer

Femoral hernia

Question 6

All are causes of mechanical intestinal obstruction except which of the following?

Accepted Answer

Mesenteric vascular occlusion

Answer

Intussusception

Answer

Bands

Answer

Gall stones

Question 7

A 69-year-old man is informed that the cause of his dysphagia is a benign lesion. The barium swallow is shown in the figure below. What should he be told regarding benign tumors and cysts of the esophagus?

Accepted Answer

Leiomyoma is the most common benign tumor encountered in the esophagus.

Answer

They are less common than malignant tumors.

Answer

They are usually asymptomatic until later in life.

Answer

Diagnosis is best confirmed through endoscopy.

Question 8

Which of the following statements regarding indirect inguinal hernia is incorrect?

Accepted Answer

Always unilateral

Answer

Inguinal herniotomy is the basic operation

Answer

Transillumination distinguishes it from hydrocele

Answer

Most common type of hernia

Question 9

What are the potential symptoms of malignant transformation in a retroperitoneal lipoma?

Accepted Answer

All of the options

Answer

Abdominal pain

Answer

Weight loss

Answer

Renal failure due to compression

Question 10

The most common complication of Zenker's diverticulum is:

Accepted Answer

Aspiration pneumonia

Answer

Dysphonia

Answer

Lung abscess

Answer

Perforation

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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