A 72-year-old woman with a background of hypertension and ischaemic heart disease presents with a 72-hour history of absolute constipation, abdominal distension, and vomiting. She has not had previous abdominal surgery. Plain abdominal radiograph shows a grossly dilated loop of bowel in the left upper quadrant with haustra visible, measuring 11 cm in diameter. The appearance resembles a 'coffee bean' sign pointing towards the right upper quadrant. What is the most appropriate next step in management?
Q102
A 58-year-old man presents to the emergency department with a 24-hour history of severe right iliac fossa pain, fever, and vomiting. He has a past medical history of hypertension and type 2 diabetes. On examination, he has a tender, irreducible lump in the right groin. His temperature is 38.5°C, heart rate 110 bpm, and blood pressure 100/65 mmHg. Bowel sounds are absent. Blood tests show: WCC 18.2 × 10⁹/L, CRP 145 mg/L, lactate 3.8 mmol/L. What is the most appropriate initial management?
Q103
A 47-year-old woman presents with a 16-hour history of severe right upper quadrant pain, fever of 39.1°C, and confusion. Her husband reports she had similar but milder pain 3 weeks ago which resolved spontaneously. On examination, she is jaundiced, blood pressure 88/52 mmHg, heart rate 125 bpm. She has severe right upper quadrant tenderness with guarding. Blood tests show: bilirubin 95 μmol/L, ALP 456 U/L, ALT 234 U/L, WCC 19.8 × 10⁹/L, CRP 312 mg/L. Which scoring system should be used to assess the severity and guide management decisions in this clinical scenario?
Q104
A 69-year-old woman undergoes CT abdomen for investigation of large bowel obstruction. The report describes a 'whirl sign' at the site of transition between dilated and collapsed bowel. What does this radiological sign indicate?
Q105
A 34-year-old man with known Crohn's disease maintained on azathioprine presents with a 24-hour history of worsening abdominal pain and fever. On examination, temperature is 38.9°C, heart rate 118 bpm, blood pressure 95/55 mmHg. His abdomen is distended with generalized peritonism. Blood tests show WCC 22.4 × 10⁹/L, CRP 285 mg/L, lactate 3.8 mmol/L. CT abdomen shows free intraperitoneal air and a 4 cm collection in the right iliac fossa with surrounding fat stranding. What is the most significant factor that increases this patient's operative mortality risk?
Q106
What is the primary mechanism by which small bowel obstruction leads to systemic hypovolaemia and circulatory compromise?
Q107
A 68-year-old man with a history of chronic obstructive pulmonary disease and ischaemic heart disease presents with sudden onset severe central abdominal pain and vomiting. On examination, he has a distended, tympanic abdomen with a palpable tender mass in the right iliac fossa. Heart rate is 105 bpm and regular. Plain abdominal radiograph shows a markedly dilated caecum measuring 13 cm in diameter. What is the most appropriate immediate management?
Q108
A 41-year-old woman undergoes emergency laparoscopy for suspected appendicitis. During the procedure, the appendix appears normal. The surgeon notes 200ml of purulent free fluid in the pelvis and a perforated area in the distal ileum approximately 60 cm from the ileocaecal valve on the antimesenteric border. There is surrounding inflammation but no other lesions are identified. What is the most likely underlying diagnosis?
Q109
A 52-year-old woman presents with a 72-hour history of severe colicky abdominal pain, vomiting, and absolute constipation. She has no previous surgical history. CT abdomen shows small bowel obstruction with a transition point in the distal ileum where a 3 cm gallstone is impacted. There are dilated small bowel loops proximally and air in the biliary tree. What is the most appropriate surgical management strategy?
Q110
A 63-year-old man with known colorectal cancer undergoes emergency laparotomy for perforated sigmoid diverticulitis. During surgery, faecal peritoneal contamination is noted with extensive purulent fluid. A Hartmann's procedure is performed. According to the Mannheim Peritonitis Index, which of the following intraoperative findings carries the highest individual prognostic weight for predicting mortality?
Acute Surgical Presentations UK Medical PG Practice Questions and MCQs
Question 101: A 72-year-old woman with a background of hypertension and ischaemic heart disease presents with a 72-hour history of absolute constipation, abdominal distension, and vomiting. She has not had previous abdominal surgery. Plain abdominal radiograph shows a grossly dilated loop of bowel in the left upper quadrant with haustra visible, measuring 11 cm in diameter. The appearance resembles a 'coffee bean' sign pointing towards the right upper quadrant. What is the most appropriate next step in management?
A. Immediate laparotomy
B. Flexible sigmoidoscopy and decompression (Correct Answer)
C. Urgent CT colonography with water-soluble contrast
D. Nasogastric tube insertion and conservative management
E. Gastrografin enema followed by observation
Explanation: ***Flexible sigmoidoscopy and decompression***
- This patient presents with classical features of **sigmoid volvulus**, including **absolute constipation**, **abdominal distension**, and the diagnostic **'coffee bean' sign** on radiograph.
- For stable patients without signs of **peritonitis** or **bowel ischemia**, endoscopic decompression is the **first-line intervention** to detorse the bowel and relieve obstruction.
*Immediate laparotomy*
- This approach is reserved for patients exhibiting signs of **bowel ischemia**, **perforation**, or those who fail initial endoscopic decompression.
- Performing a **laparotomy** as the primary step carries higher morbidity and mortality compared to endoscopic management in a stable patient.
*Urgent CT colonography with water-soluble contrast*
- The **plain abdominal radiograph** with the **'coffee bean' sign** provides sufficient diagnostic clarity for sigmoid volvulus, making further immediate imaging unnecessary.
- **CT colonography** is typically used for cancer staging or identifying other causes of obstruction, but is contraindicated in acute distension due to **perforation risk**.
*Nasogastric tube insertion and conservative management*
- **Nasogastric decompression** is primarily indicated for **small bowel obstruction** and is ineffective for a mechanical torsion like **sigmoid volvulus**.
- Relying solely on conservative measures for a volvulus carries a significant risk of **bowel infarction** and subsequent rupture.
*Gastrografin enema followed by observation*
- While **Gastrografin enema** can be diagnostic or therapeutic for certain bowel obstructions (e.g., meconium ileus, adhesive SBO), it is not the primary treatment for **sigmoid volvulus**.
- **Flexible sigmoidoscopy** is preferred as it allows for direct visualization of mucosal viability and immediate therapeutic decompression.
Question 102: A 58-year-old man presents to the emergency department with a 24-hour history of severe right iliac fossa pain, fever, and vomiting. He has a past medical history of hypertension and type 2 diabetes. On examination, he has a tender, irreducible lump in the right groin. His temperature is 38.5°C, heart rate 110 bpm, and blood pressure 100/65 mmHg. Bowel sounds are absent. Blood tests show: WCC 18.2 × 10⁹/L, CRP 145 mg/L, lactate 3.8 mmol/L. What is the most appropriate initial management?
A. Administer IV antibiotics and perform urgent CT abdomen
B. Attempt manual reduction of the hernia in the emergency department
C. Emergency surgical exploration and repair (Correct Answer)
D. Conservative management with nasogastric decompression and IV fluids
E. Arrange urgent ultrasound of the groin
Explanation: ***Emergency surgical exploration and repair***- The patient presents with clear signs of a **strangulated hernia**, including a **tender, irreducible groin lump**, systemic inflammatory response (fever, tachycardia, elevated WCC/CRP), and alarming signs of **bowel ischemia** (absent bowel sounds, hypotension, and significantly elevated **lactate 3.8 mmol/L**).- This is a **surgical emergency** requiring immediate operative intervention to assess bowel viability, resect any necrotic bowel, and repair the hernia, preventing complications like **perforation** and **sepsis**.*Administer IV antibiotics and perform urgent CT abdomen*- While **IV antibiotics** are appropriate for sepsis, ordering an urgent **CT abdomen** would significantly delay definitive surgical management in a patient with clear clinical evidence of **strangulation** and **bowel ischemia**.- The diagnosis of a strangulated hernia is primarily **clinical**, and imaging should not postpone **emergency surgery** when clinical signs strongly suggest **bowel compromise**.*Attempt manual reduction of the hernia in the emergency department*- Manual reduction (taxis) is **absolutely contraindicated** in cases where **bowel strangulation or ischemia** is suspected, as indicated by the patient's severe symptoms and elevated lactate.- Attempting to reduce potentially **necrotic or ischemic bowel** back into the abdominal cavity can lead to **perforation**, widespread **peritonitis**, and fatal outcomes.*Conservative management with nasogastric decompression and IV fluids*- **Conservative management** is appropriate for uncomplicated bowel obstruction without signs of ischemia or strangulation; however, this patient has clear signs of a **strangulated hernia** with systemic toxicity and **high lactate**.- Delaying surgery with conservative measures in this scenario would lead to inevitable progression of **bowel gangrene**, **perforation**, and **sepsis**, significantly increasing morbidity and mortality.*Arrange urgent ultrasound of the groin*- An **urgent ultrasound** would introduce an unnecessary delay in management, as the clinical presentation with a **tender, irreducible lump**, systemic inflammatory response, and high **lactate** is highly suggestive of a **strangulated hernia**.- While ultrasound can confirm hernia contents, it does not reliably rule out **strangulation or ischemia** in an acutely unwell patient, and definitive management requires **surgical exploration**.
Question 103: A 47-year-old woman presents with a 16-hour history of severe right upper quadrant pain, fever of 39.1°C, and confusion. Her husband reports she had similar but milder pain 3 weeks ago which resolved spontaneously. On examination, she is jaundiced, blood pressure 88/52 mmHg, heart rate 125 bpm. She has severe right upper quadrant tenderness with guarding. Blood tests show: bilirubin 95 μmol/L, ALP 456 U/L, ALT 234 U/L, WCC 19.8 × 10⁹/L, CRP 312 mg/L. Which scoring system should be used to assess the severity and guide management decisions in this clinical scenario?
A. Ranson's criteria for acute pancreatitis severity
B. Tokyo Guidelines for acute cholangitis severity assessment (Correct Answer)
C. Hinchey classification for diverticulitis staging
D. Alvarado score for appendicitis probability
E. Modified Glasgow score for pancreatitis severity
Explanation: ***Tokyo Guidelines for acute cholangitis severity assessment***
- The patient presents with **Reynolds' Pentad** (right upper quadrant pain, fever, jaundice, hypotension, and confusion) and severe inflammation, which indicates **Grade III (severe) acute cholangitis**, necessitating urgent biliary decompression.
- The **Tokyo Guidelines (TG18)** are the established international standard for diagnosing and stratifying the severity of **acute cholangitis** based on systemic inflammation, cholestasis, and imaging findings.
*Ranson's criteria for acute pancreatitis severity*
- This scoring system is specifically designed to predict the prognosis and mortality of **acute pancreatitis** at specific time points, not for biliary infections.
- It utilizes parameters like age, WBC, glucose, and LDH, which are not tailored for assessing the severity and management of **biliary sepsis**.
*Hinchey classification for diverticulitis staging*
- This classification system is exclusively used to stage the severity of **colonic diverticulitis** and its complications, such as abscess formation or generalized peritonitis.
- It is entirely unrelated to diseases of the **biliary tract** and does not apply to the patient's symptoms of jaundice and RUQ pain.
*Alvarado score for appendicitis probability*
- The Alvarado score is a clinical tool used to assess the probability of **acute appendicitis**, based on symptoms like migratory pain, anorexia, and rebound tenderness.
- It does not incorporate features like **jaundice**, severe systemic inflammatory response, or hemodynamic instability, which are central to cholangitis.
*Modified Glasgow score for pancreatitis severity*
- Similar to Ranson's criteria, the Modified Glasgow score is used to predict the severity of **acute pancreatitis** within the initial 48 hours of presentation.
- While it uses some common inflammatory markers, it is not validated for the diagnosis or severity assessment of **acute cholangitis** or obstructive biliary pathology.
Question 104: A 69-year-old woman undergoes CT abdomen for investigation of large bowel obstruction. The report describes a 'whirl sign' at the site of transition between dilated and collapsed bowel. What does this radiological sign indicate?
A. Intussusception of bowel with telescoping of one segment into another
B. Closed-loop obstruction with twisting of mesentery around a vascular pedicle (Correct Answer)
C. Internal hernia through a mesenteric defect
D. Adhesional band causing acute angulation of bowel
E. Malignant infiltration causing narrowing and obstruction
Explanation: ***Closed-loop obstruction with twisting of mesentery around a vascular pedicle***
- The **whirl sign** on CT is pathognomonic for **volvulus**, indicating twisting of the bowel loops and **mesenteric vessels** around a vascular pedicle.
- This represents a **closed-loop obstruction** with compromised blood flow, carrying a significant risk of **bowel ischemia** and infarction.
*Intussusception of bowel with telescoping of one segment into another*
- Intussusception is typically characterized by a **target sign** or **pseudokidney sign** on imaging, representing concentric layers of bowel.
- It involves the telescoping of one bowel segment into another, a distinct mechanism from mesenteric twisting.
*Internal hernia through a mesenteric defect*
- Internal hernias lead to bowel obstruction by trapping segments through a peritoneal or mesenteric defect, often showing **clustered bowel loops**.
- While they can cause obstruction, they do not inherently produce the characteristic **spiral configuration** of the whirl sign unless complicated by secondary volvulus.
*Adhesional band causing acute angulation of bowel*
- Adhesions cause obstruction primarily by **kinking** or extrinsic compression of the bowel, leading to a simple transition point.
- This mechanism does not involve the **axial rotation** of the mesentery and its vessels that is required to produce a whirl sign.
*Malignant infiltration causing narrowing and obstruction*
- Malignant bowel obstruction typically presents with **focal wall thickening**, irregular luminal narrowing (e.g., **apple-core lesion**), or a mass.
- The radiological appearance does not include the **mesenteric rotation** or spiral pattern associated with the whirl sign.
Question 105: A 34-year-old man with known Crohn's disease maintained on azathioprine presents with a 24-hour history of worsening abdominal pain and fever. On examination, temperature is 38.9°C, heart rate 118 bpm, blood pressure 95/55 mmHg. His abdomen is distended with generalized peritonism. Blood tests show WCC 22.4 × 10⁹/L, CRP 285 mg/L, lactate 3.8 mmol/L. CT abdomen shows free intraperitoneal air and a 4 cm collection in the right iliac fossa with surrounding fat stranding. What is the most significant factor that increases this patient's operative mortality risk?
A. The presence of immunosuppression from azathioprine therapy (Correct Answer)
B. The underlying diagnosis of Crohn's disease
C. The presence of an intra-abdominal collection requiring drainage
D. The severity of peritoneal contamination requiring emergency surgery
E. The patient's age and associated nutritional deficiencies
Explanation: ***The presence of immunosuppression from azathioprine therapy*** - **Immunosuppressive therapy**, including azathioprine, is the most significant predictor of adverse outcomes in Crohn's patients, doubling or tripling the risk of **postoperative sepsis** and **anastomotic leaks**. - These agents directly impair **wound healing** and the body's inflammatory response, which increases the likelihood of mortality in the setting of emergency surgery for **peritonitis**. *The underlying diagnosis of Crohn's disease* - While **Crohn's disease** necessitates the surgery, the primary diagnosis itself is less predictive of mortality than the current **physiological state** and medication effects. - The chronic nature of the disease influences surgical strategy, such as the preference for **stoma creation**, rather than being the single most significant mortality risk factor. *The presence of an intra-abdominal collection requiring drainage* - A **4 cm collection** is a source of infection, but it can often be managed with **peritoneal washout** or percutaneous drainage during the surgical intervention. - The systemic impact of **immunosuppression** poses a greater risk to recovery and survival than the localized abscess itself. *The severity of peritoneal contamination requiring emergency surgery* - **Generalized peritonism** and **free air** indicate a surgical emergency, but modern surgical techniques and critical care can often manage the source. - Mortality risk is disproportionately higher when the patient lacks a robust **immune response** to handle the bacteremia and inflammatory surge following the contamination. *The patient's age and associated nutritional deficiencies* - At **34 years old**, the patient's age is a protective factor rather than a significant driver of mortality. - Although **nutritional deficiencies** (common in Crohn's) do impair healing, the pharmaceutical **immunosuppression** exerts a more potent systemic effect on operative risk in an acute setting.
Question 106: What is the primary mechanism by which small bowel obstruction leads to systemic hypovolaemia and circulatory compromise?
A. Increased vomiting leading to direct fluid loss from the gastrointestinal tract
B. Bacterial translocation causing systemic inflammatory response and capillary leak
C. Sequestration of fluid in the bowel lumen and bowel wall (third spacing) (Correct Answer)
D. Increased insensible losses from tachypnoea and fever
E. Reduced oral fluid intake due to nausea and anorexia
Explanation: ***Sequestration of fluid in the bowel lumen and bowel wall (third spacing)***
- This is the primary driver of hypovolaemia, as **8-10 liters** of daily secretions cannot be absorbed and become trapped in the non-functional "**third space**."
- **Venous and lymphatic congestion** in the obstructed bowel wall leads to significant edema and leakage into the peritoneal cavity, rapidly depleting the **intravascular volume**.
*Increased vomiting leading to direct fluid loss from the gastrointestinal tract*
- While vomiting causes external fluid and electrolyte loss, it is often a **secondary or late sign** and does not account for the massive internal fluid shift seen in bowel obstructions.
- Patients with a **nasogastric tube** for decompression still develop severe hypovolaemia due to ongoing internal sequestration despite the lack of active vomiting.
*Bacterial translocation causing systemic inflammatory response and capillary leak*
- This mechanism is primarily associated with **strangulation**, ischemia, or intestinal gangrene rather than simple mechanical obstruction.
- It represents a progression toward **septic shock**, whereas early circulatory compromise is typically driven by fluid shifts alone.
*Increased insensible losses from tachypnoea and fever*
- These factors contribute to some degree of dehydration but represent a **negligible volume** compared to the liters of fluid lost through third-spacing.
- Fever typically occurs as a complication of **perforation or ischemia** rather than the early mechanical process of obstruction.
*Reduced oral fluid intake due to nausea and anorexia*
- Decreased intake certainly exacerbates the fluid deficit, but it cannot explain the rapid **hemodynamic collapse** seen in acute surgical presentations.
- The systemic volume crisis is driven by the active loss of **pre-existing circulatory volume** into the gut lumen and wall.
Question 107: A 68-year-old man with a history of chronic obstructive pulmonary disease and ischaemic heart disease presents with sudden onset severe central abdominal pain and vomiting. On examination, he has a distended, tympanic abdomen with a palpable tender mass in the right iliac fossa. Heart rate is 105 bpm and regular. Plain abdominal radiograph shows a markedly dilated caecum measuring 13 cm in diameter. What is the most appropriate immediate management?
A. Emergency right hemicolectomy with ileostomy
B. Colonoscopic decompression followed by caecostomy
C. Trial of neostigmine infusion with cardiac monitoring
D. Immediate laparotomy with caecostomy or caecal decompression (Correct Answer)
E. Conservative management with nasogastric decompression and bowel rest
Explanation: ***Immediate laparotomy with caecostomy or caecal decompression***
- A **caecal diameter >12 cm** represents a surgical emergency because the risk of **perforation** increases significantly, as described by **Laplace's Law**.
- The palpable tender mass in the right iliac fossa and sudden onset pain suggest **caecal volvulus** with impending **bowel ischaemia**, requiring urgent surgical intervention to prevent necrosis.
*Emergency right hemicolectomy with ileostomy*
- While a definitive procedure for **caecal volvulus**, it is a more extensive and physiologically demanding operation, especially for an elderly patient with significant **ischaemic heart disease**.
- This procedure is typically reserved for cases with clear evidence of **gangrenous bowel** or for hemodynamically stable patients who can tolerate a major resection.
*Colonoscopic decompression followed by caecostomy*
- **Colonoscopic decompression** is rarely successful for **caecal volvulus** due to the anatomical difficulty in derotating the caecum endoscopically, unlike sigmoid volvulus.
- Attempting endoscopy would cause an unacceptable delay in a patient with a **13 cm dilated caecum** and tenderness, significantly increasing the risk of **perforation**.
*Trial of neostigmine infusion with cardiac monitoring*
- **Neostigmine** is indicated for **Ogilvie's syndrome** (acute colonic pseudo-obstruction), not for mechanical obstructions like **caecal volvulus**.
- Given the patient's history of **ischaemic heart disease**, neostigmine could be dangerous due to its potential to induce **bradycardia** and exacerbate cardiac compromise.
*Conservative management with nasogastric decompression and bowel rest*
- **Conservative management** is absolutely contraindicated when the **caecal diameter exceeds 12 cm** due to the very high and imminent risk of **perforation**.
- **Mechanical obstructions** like **caecal volvulus** do not resolve with bowel rest and require active surgical or interventional treatment to decompress the bowel and restore blood supply.
Question 108: A 41-year-old woman undergoes emergency laparoscopy for suspected appendicitis. During the procedure, the appendix appears normal. The surgeon notes 200ml of purulent free fluid in the pelvis and a perforated area in the distal ileum approximately 60 cm from the ileocaecal valve on the antimesenteric border. There is surrounding inflammation but no other lesions are identified. What is the most likely underlying diagnosis?
A. Perforated Crohn's disease
B. Perforated Meckel's diverticulum (Correct Answer)
C. Perforated ileal carcinoid tumour
D. Perforated typhoid ulcer
E. Perforated small bowel lymphoma
Explanation: ***Perforated Meckel's diverticulum***- The location of the perforation on the **antimesenteric border**, approximately **60 cm (2 feet)** from the **ileocaecal valve**, is a classic presentation of a Meckel's diverticulum complications according to the **rule of 2s**.- Perforation can occur due to **diverticulitis** (mimicking appendicitis) or ulceration caused by **ectopic gastric mucosa**, leading to purulent or fecal peritonitis.*Perforated Crohn's disease*- Crohn's disease typically involves **chronic inflammatory changes**, thickened bowel walls ("fat wrapping"), or **fistulae**, which were not described in this acute presentation.- While it can cause perforations, they are usually contained by **adhesions** or present with more extensive regional small bowel involvement rather than a solitary diverticular defect.*Perforated ileal carcinoid tumour*- Carcinoid tumours are the most common small bowel malignancy but typically present with **intestinal obstruction** or **mesenteric desmoplasia** rather than spontaneous perforation.- These tumours usually appear as **firm, yellow nodules** in the submucosa, which would likely have been identified as a distinct mass by the surgeon.*Perforated typhoid ulcer*- Typhoid perforation is usually preceded by a significant systemic illness involving **sustained high fever**, headache, and malaise (**enteric fever**).- It typically results in **multiple longitudinal ulcers** and perforations in the distal ileum, rather than a single isolated lesion on the antimesenteric border.*Perforated small bowel lymphoma*- Lymphoma usually presents with persistent **weight loss**, night sweats, or a palpable **abdominal mass** due to bulky lymphadenopathy.- Perforations in lymphoma are often secondary to **chemotherapy** or occur through a large, necrotic tumour mass rather than appearing as a simple perforation in an otherwise normal-looking bowel.
Question 109: A 52-year-old woman presents with a 72-hour history of severe colicky abdominal pain, vomiting, and absolute constipation. She has no previous surgical history. CT abdomen shows small bowel obstruction with a transition point in the distal ileum where a 3 cm gallstone is impacted. There are dilated small bowel loops proximally and air in the biliary tree. What is the most appropriate surgical management strategy?
A. Enterolithotomy alone to remove the impacted stone (Correct Answer)
B. Enterolithotomy with simultaneous cholecystectomy and fistula repair
C. Right hemicolectomy to remove the obstruction site
D. Laparoscopic cholecystectomy followed by interval enterolithotomy
E. Endoscopic extraction of the gallstone via colonoscopy
Explanation: ***Enterolithotomy alone to remove the impacted stone***- In the management of **gallstone ileus**, the primary goal is to relieve the **mechanical bowel obstruction** efficiently to minimize operative risk in often elderly or comorbid patients.- **Enterolithotomy alone** is the gold standard because trying to repair the **cholecystoenteric fistula** in the acute setting significantly increases **morbidity and mortality**.*Enterolithotomy with simultaneous cholecystectomy and fistula repair*- Termed a **one-stage procedure**, this is generally avoided in the emergency setting due to the risk of **prolonged operative time** and complications from inflamed tissues.- It is only considered in highly selected, stable, and younger patients with specific indications like **gangrenous cholecystitis**.*Right hemicolectomy to remove the obstruction site*- This is an **unnecessarily extensive** and aggressive resection for a benign mechanical obstruction caused by a gallstone.- Surgery should focus on a simple **longitudinal enterotomy** proximal to the point of stone impaction to preserve bowel length.*Laparoscopic cholecystectomy followed by interval enterolithotomy*- The **enterolithotomy** must be performed first as an emergency to resolve the life-threatening **small bowel obstruction** and **absolute constipation**.- Reversing the order is clinically inappropriate as **pneumobilia** and a fistula are secondary to the primary problem of the impacted stone.*Endoscopic extraction of the gallstone via colonoscopy*- Colonoscopy cannot reach the **distal ileum** where the transition point and stone are located, making this approach technically unfeasible.- **Gallstone ileus** requires surgical intervention (laparotomy or laparoscopy) as the stone is trapped within the **small bowel lumen**.
Question 110: A 63-year-old man with known colorectal cancer undergoes emergency laparotomy for perforated sigmoid diverticulitis. During surgery, faecal peritoneal contamination is noted with extensive purulent fluid. A Hartmann's procedure is performed. According to the Mannheim Peritonitis Index, which of the following intraoperative findings carries the highest individual prognostic weight for predicting mortality?
A. Presence of malignancy as an underlying pathology (Correct Answer)
B. Faecal contamination of the peritoneal cavity
C. Diffuse generalized peritonitis rather than localized
D. Age over 50 years at the time of surgery
E. Duration of symptoms exceeding 24 hours before surgery
Explanation: ***Presence of malignancy as an underlying pathology***\n- In the **Mannheim Peritonitis Index (MPI)**, the presence of **malignancy** carries the highest specific prognostic weight assigned to an underlying cause, contributing **8 points** to the total score.\n- This high weighting reflects the increased risk of mortality associated with **immunosuppression**, frailty, and the complexity of surgical management in cancer patients.\n\n*Faecal contamination of the peritoneal cavity*\n- While clinically severe, **faecal exudate** is assigned **6 points** in the MPI scoring system.\n- It indicates a higher risk than clear or purulent fluid but carries less weight than **malignancy** or **organ failure**.\n\n*Diffuse generalized peritonitis rather than localized*\n- The **extension of peritonitis** to the diffuse generalized form contributes **6 points** to the MPI calculation.\n- Localized peritonitis is considered lower risk and does not add points to the index.\n\n*Age over 50 years at the time of surgery*\n- Being **over 50 years** of age is a significant demographic risk factor in the MPI, but it only contributes **5 points**.\n- This is a fixed threshold used to simplify prognosis in emergency surgical settings.\n\n*Duration of symptoms exceeding 24 hours before surgery*\n- A **symptom duration** greater than 24 hours reflects a delay in treatment and is assigned **4 points**.\n- Although it influences outcomes, it has the lowest weight among the factors listed in this specific scoring system.
