Gastrointestinal Surgery Practice Questions

Q: A 60-year-old diabetic man is admitted to the hospital with a diagnosis of acute cholecystitis. The white blood cell count is 28,000, and a plain film of the abdomen and computed tomography scan show evidence of intramural gas in the gallbladder. What is the most likely diagnosis?

Emphysematous gallbladder. ***Emphysematous gallbladder*** - The presence of **intramural gas** in the gallbladder wall, along with signs of **acute cholecystitis** and a high WBC count in a diabetic patient, is highly characteristic of emphysematous cholecystitis. - This severe form of cholecystitis is caused by gas-forming organisms, often seen in older, diabetic, or immunocompromised patients. *Acalculous cholecystitis* - This condition is **acute inflammation of the gallbladder** without the presence of gallstones, often seen in critically ill patients. - While it can be severe, it does not typically present with **intramural gas** as a primary diagnostic feature unless complicated by gas-forming organisms, which would then lead to emphysematous cholecystitis. *Cholangiohepatitis* - This refers to inflammation of the **bile ducts and liver parenchyma**, often presenting with fever, jaundice, and RUQ pain, but less commonly with gallbladder wall thickening or intramural gas. - Diagnosis usually requires evidence of **intrahepatic or extrahepatic bile duct dilation** or stones, which are not described here. *Sclerosing cholangitis* - This is a chronic, progressive cholestatic liver disease characterized by **inflammation and fibrosis of the bile ducts**, leading to strictures. - It presents with symptoms like **pruritus, fatigue, and jaundice**, and a diagnosis is typically made by cholangiography showing "beading" of the bile ducts; it does not involve intramural gallbladder gas.

Q: What is the most appropriate surgical management for a patient with achalasia who has tried nonoperative therapies, including lifestyle modifications, calcium channel blockers, botulin toxin injections, and endoscopic pneumatic dilatation, but has not experienced symptom relief?

Modified Heller myotomy and partial fundoplication. ***Modified Heller myotomy and partial fundoplication*** - A **Heller myotomy** involves incising the muscle fibers of the lower esophageal sphincter (LES) to relieve obstruction, which is the definitive treatment for achalasia. - A **partial fundoplication** is added to prevent **postoperative gastroesophageal reflux disease (GERD)**, a common complication of myotomy. *Esophagectomy* - **Esophagectomy** is a highly invasive procedure involving removal of the esophagus, reserved for end-stage achalasia with **megaesophagus** or **recurrent aspiration**, not typically first-line surgical management. - It carries significant morbidity and mortality risks, making it an option only as a **last resort** when other treatments have failed and the esophagus is severely diseased. *Surgical esophagomyotomy proximal to the LES* - A myotomy specifically targets the **hypertonic LES** to relieve dysphagia. Performing it significantly proximal to the LES would not address the primary pathology. - While myotomy is the correct approach, its efficacy depends on precise dissection of the muscle fibers at the **gastroesophageal junction** where the LES is located. *Repeat pneumatic dilation with higher pressures* - Although **pneumatic dilation** is an effective *nonoperative* treatment, the patient has already undergone it without relief, indicating a **refractory case**. - Repeating the procedure with higher pressures increases the risk of **esophageal perforation** without necessarily improving long-term outcomes in a patient who has already failed multiple prior treatments.

Q: Which of the following statements about the esophagoscope is correct?

The incisor acts as a fulcrum.. ***The incisor acts as a fulcrum.*** - During **esophagoscopy**, the upper incisors serve as the pivotal point or **fulcrum** against which the instrument is manipulated. - This positioning allows for controlled advancement and angulation of the esophagoscope into the esophagus. *It lifts the epiglottis.* - The **esophagoscope** is primarily designed to visualize the esophagus and does not typically lift the **epiglottis**. - **Laryngoscopes** are the instruments specifically used to lift the epiglottis for visualizing the vocal cords and trachea during intubation. *The tip is in the pyriform fossa.* - The **pyriform fossa** is a structure in the **hypopharynx**, and while the esophagoscope passes through this region, its tip is advanced beyond it into the **esophagus** for proper visualization. - Positioning the tip solely in the pyriform fossa would not achieve the purpose of an **esophagoscopy**, which is to examine the esophageal lumen. *It compresses the posterior tongue.* - The esophagoscope is carefully advanced to bypass the tongue and pharyngeal structures, not to **compress** the **posterior tongue**. - Compression of the posterior tongue would obstruct the view and potentially cause trauma or gag reflex, hindering the procedure.

Q: What is the absolute indication for choledochotomy?

Palpable CBD stone. ***Palpable CBD stone*** - A **palpable stone in the common bile duct (CBD)** during surgery is an absolute indication for **choledochotomy** (surgical incision into the CBD) to remove the stone. - This direct finding necessitates immediate removal to prevent complications like **cholangitis**, **pancreatitis**, or **biliary obstruction**. *Gallstone ileus* - This condition involves a **gallstone eroding into the bowel** and causing mechanical obstruction, typically in the small intestine. - While it's a complication of gallstone disease, the primary treatment involves addressing the bowel obstruction, not necessarily choledochotomy for the CBD itself. *Fever* - Fever in the context of biliary disease usually indicates **cholangitis** or other infections. - While it prompts investigation for **biliary obstruction**, fever alone is not an absolute indication for choledochotomy without evidence of a CBD stone that requires removal. *Gallstone pancreatitis* - **Gallstone pancreatitis** occurs when gallstones obstruct the pancreatic duct or ampulla, leading to inflammation of the pancreas. - Most cases resolve spontaneously, and the primary management often involves supportive care and elective cholecystectomy, not immediate choledochotomy unless there's persistent obstruction or cholangitis.

Q: How do you differentiate between mechanical obstruction and paralytic ileus?

Absence of rectal gas shadow in imaging studies. ***Absence of rectal gas shadow in imaging studies*** - In **mechanical bowel obstruction**, there is typically an **absent rectal gas shadow** because the physical blockage prevents gas from reaching the distal bowel and rectum. - This finding is a **classic radiological sign** that helps distinguish mechanical obstruction from paralytic ileus, where rectal gas is usually present throughout the bowel. *Presence of multiple air-fluid levels in the bowel* - **Multiple air-fluid levels** can be seen in both **mechanical obstruction** and **paralytic ileus**, making it a poor differentiating feature. - While more pronounced in mechanical obstruction, air-fluid levels are not specific enough to reliably distinguish between the two conditions. *Presence of abdominal distension* - **Abdominal distension** occurs in both **mechanical obstruction** (due to trapped gas proximal to blockage) and **paralytic ileus** (due to generalized bowel dilation). - This finding is **non-specific** and cannot differentiate between the two conditions as both present with significant distension. *Elevation of hemidiaphragm on imaging* - **Elevated hemidiaphragm** can result from various abdominal conditions causing upward pressure or diaphragmatic dysfunction, not specifically related to bowel obstruction type. - This finding is **not diagnostic** for differentiating mechanical obstruction from paralytic ileus and may be seen in both conditions.

Q: A 26-year-old male presented with a 4-day history of pain in the right-sided lower abdomen, accompanied by frequent vomiting. His general condition is fair, and clinically, a tender lump was felt in the right iliac fossa. What is the most appropriate management for this case?

Ochsner-Sherren regimen for appendicitis with mass. ***Ochsner-Sherren regimen for appendicitis with mass*** - The presence of a **tender lump in the right iliac fossa** suggests a contained appendiceal mass or abscess, indicating a more chronic or walled-off inflammatory process rather than acute perforation. - The Ochsner-Sherren regimen involves **conservative management** with intravenous fluids, antibiotics, and close observation, aiming to resolve the inflammation before considering elective appendectomy. *Exploratory laparotomy* - This is a more invasive procedure typically reserved for cases where there is **peritoneal irritation**, generalized peritonitis, or diagnostic uncertainty. - In cases of a contained appendiceal mass, immediate laparotomy might disrupt the natural containment, potentially leading to **widespread peritonitis**. *Immediate appendectomy* - Immediate appendectomy is indicated for **acute, uncomplicated appendicitis** or appendicitis with signs of perforation without a well-defined mass. - Performing an immediate appendectomy on a well-established appendiceal mass or abscess carries a **higher risk of complications** like bowel injury or incomplete removal due to inflamed and friable tissues. *External drainage* - External drainage is considered for a **well-localized appendiceal abscess** that can be accessed percutaneously, often guided by imaging. - While it might be a part of the management for an appendiceal abscess, it is not the initial or sole management for an **appendiceal mass**, which first requires conservative treatment to reduce inflammation.

Q: What is the most common cause of bacterial peritonitis?

Perforated viscus. ***Perforated viscus*** - A **perforated viscus**, such as a perforated peptic ulcer or diverticulum, is the most frequent cause of **secondary bacterial peritonitis**. - This leads to the direct spillage of **gastrointestinal contents**, including bacteria, into the peritoneal cavity. *Primary or spontaneous* - **Spontaneous bacterial peritonitis (SBP)** occurs in the absence of an identifiable source of infection, most commonly in patients with **ascites** due to liver cirrhosis. - While significant in its specific patient population, SBP is generally less common than peritonitis resulting from an intra-abdominal source. *Foreign body* - Peritonitis due to a **foreign body** (e.g., retained surgical sponge, swallowed sharp object) is a less common cause compared to perforation. - While it can lead to inflammation and infection, it does not represent the majority of bacterial peritonitis cases. *Biliary peritonitis* - **Biliary peritonitis** results from leakage of bile into the peritoneal cavity, often due to a perforated gallbladder or bile duct injury. - Though serious, it is a specific type of secondary peritonitis and not the overall most common cause, which more broadly includes gastrointestinal perforations.

Q: The most common type of cancer in the middle third of the esophagus is:

Squamous Cell Carcinoma. ***Squamous Carcinoma*** - This type of cancer is the most **common in the middle third** of the esophagus [1] and is often associated with **smoking** and **alcohol consumption**. - Squamous cell carcinoma typically arises from the **esophageal lining**, leading to symptoms like dysphagia and weight loss. *Leiomyosarcoma* - This is a **rare soft tissue sarcoma** that arises from smooth muscle, not commonly found in the esophagus. - It often presents as a **mass lesion**, but does not typically occur in the middle third of the esophagus. *Adeno Carcinoma* - While adenocarcinoma is a common type of esophageal cancer, it primarily occurs in the **lower third** of the esophagus, associated with **Barrett's esophagus**. - The typical risk factors include **GERD** and obesity, differing from the pattern of squamous cell carcinoma. *Adeno squamous Carcinoma* - This subtype is relatively **uncommon** and involves both adenocarcinoma and squamous carcinoma components, which complicates diagnosis. - It does not specifically localize to the **middle third** of the esophagus, making it less likely in this context. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 764-767.

Q: Treatment of choice for annular pancreas is

Duodeno duodenostomy. ***Duodeno duodenostomy*** - This procedure **bypasses the annular segment** of the pancreas by creating an anastomosis between the two healthy segments of the duodenum, proximal and distal to the obstruction. - It maintains the continuity of the **gastrointestinal tract** and preserves pancreatic and biliary outflow into the duodenum. *Gastrojejunostomy* - This procedure connects the stomach to the jejunum, **bypassing the duodenum entirely**. - While it can relieve gastric outlet obstruction, it does not directly address the **duodenal obstruction** caused by an annular pancreas and can lead to **biliary stasis** and malabsorption due to bypassing the duodenal papilla. *Vagotomy and GJ* - **Vagotomy** is a procedure to reduce acid secretion in the stomach, typically performed for peptic ulcer disease, and is **irrelevant** to the anatomical obstruction of an annular pancreas. - **Gastrojejunostomy** alone, as mentioned, is not the optimal solution for duodenal obstruction caused by an annular pancreas as it bypasses an important digestive segment. *Billroth 2 reconstruction* - This is a type of **gastrectomy** where the stomach is resected and the remainder is anastomosed to the jejunum. - It is used for conditions like gastric cancer or complicated ulcers and is **not indicated** for an annular pancreas, which primarily causes duodenal obstruction.

Q: Most common site for impaction of gallstones in gallstone ileus is:

Terminal ileum. ***Terminal ileum*** - The **terminal ileum** is the narrowest part of the small bowel, making it the most common site for **gallstone impaction** in gallstone ileus. - Due to a combination of its relatively small lumen and its position at the **end of the small intestine**, large gallstones are most likely to become lodged here, causing obstruction. *First part of duodenum* - The **duodenum**, especially the first part, has a relatively **wide lumen** and is typically not a site of impaction for gallstones causing ileus. - While the fistula often forms here, the stone usually **passes distally** without obstruction at this point. *Second part of duodenum* - Similar to the first part, the **second part of the duodenum** is wide and designed for chyme propulsion, making impaction here less common. - Gallstones typically move quickly through the duodenum into the **jejunum** and **ileum**. *Colon* - The **colon** has a much larger diameter than the small intestine, making gallstone impaction unlikely unless the stone is exceptionally large or there is pre-existing stricture. - Though very rarely, a gallstone may pass into the colon via a **cholecystocolonic fistula**, but obstruction is still rare due to the wide lumen.

Question 1

A 60-year-old diabetic man is admitted to the hospital with a diagnosis of acute cholecystitis. The white blood cell count is 28,000, and a plain film of the abdomen and computed tomography scan show evidence of intramural gas in the gallbladder. What is the most likely diagnosis?

Accepted Answer

Emphysematous gallbladder

Answer

Acalculous cholecystitis

Answer

Cholangiohepatitis

Answer

Sclerosing cholangitis

Question 2

What is the most appropriate surgical management for a patient with achalasia who has tried nonoperative therapies, including lifestyle modifications, calcium channel blockers, botulin toxin injections, and endoscopic pneumatic dilatation, but has not experienced symptom relief?

Accepted Answer

Modified Heller myotomy and partial fundoplication

Answer

Repeat pneumatic dilation with higher pressures

Answer

Esophagectomy

Answer

Surgical esophagomyotomy proximal to the LES

Question 3

Which of the following statements about the esophagoscope is correct?

Accepted Answer

The incisor acts as a fulcrum.

Answer

It lifts the epiglottis.

Answer

The tip is in the pyriform fossa.

Answer

It compresses the posterior tongue.

Question 4

What is the absolute indication for choledochotomy?

Accepted Answer

Palpable CBD stone

Answer

Gallstone ileus

Answer

Fever

Answer

Gallstone pancreatitis

Question 5

How do you differentiate between mechanical obstruction and paralytic ileus?

Accepted Answer

Absence of rectal gas shadow in imaging studies

Answer

Presence of multiple air-fluid levels in the bowel

Answer

Presence of abdominal distension

Answer

Elevation of hemidiaphragm on imaging

Question 6

A 26-year-old male presented with a 4-day history of pain in the right-sided lower abdomen, accompanied by frequent vomiting. His general condition is fair, and clinically, a tender lump was felt in the right iliac fossa. What is the most appropriate management for this case?

Accepted Answer

Ochsner-Sherren regimen for appendicitis with mass

Answer

Immediate appendectomy

Answer

External drainage

Answer

Exploratory laparotomy

Question 7

What is the most common cause of bacterial peritonitis?

Accepted Answer

Perforated viscus

Answer

Primary or spontaneous

Answer

Foreign body

Answer

Biliary peritonitis

Question 8

The most common type of cancer in the middle third of the esophagus is:

Accepted Answer

Squamous Cell Carcinoma

Answer

Adenocarcinoma

Answer

Adeno-Squamous Carcinoma

Answer

Leiomyosarcoma

Question 9

Treatment of choice for annular pancreas is

Accepted Answer

Duodeno duodenostomy

Answer

Vagotomy and GJ

Answer

Billroth 2 reconstruction

Answer

Gastrojejunostomy

Question 10

Most common site for impaction of gallstones in gallstone ileus is:

Accepted Answer

Terminal ileum

Answer

Colon

Answer

Second part of duodenum

Answer

First part of duodenum

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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