General Surgery — MCQs
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A 45-year-old woman presents with a 24-hour history of right iliac fossa pain that initially started periumbilically. On examination, she has localised tenderness at McBurney's point. What is the embryological explanation for the initial periumbilical pain in acute appendicitis?
A 59-year-old man with newly diagnosed sigmoid colon adenocarcinoma undergoes staging CT imaging. The report describes tumour invasion through the muscularis propria into subserosa but not penetrating the visceral peritoneum. There is no lymph node involvement or distant metastases. According to TNM staging, what is the T stage of this tumour?
A 68-year-old woman undergoes elective repair of a femoral hernia. Which anatomical structure forms the medial border of the femoral canal?
A 52-year-old man undergoes an open appendicectomy for acute appendicitis. During the procedure, the appendix is noted to be retrocaecal in position. What percentage of the population has a retrocaecal appendix?
A 48-year-old woman presents with recurrent episodes of right iliac fossa pain over 6 months. CT scan incidentally shows an appendix with a dilated, fluid-filled lumen measuring 2.8 cm in diameter with a thin wall and no surrounding inflammation. The appendix has a 'onion-skin' appearance on imaging. No appendicolith is visible. What is the most appropriate management of this imaging finding?
A 56-year-old man with Lynch syndrome (hereditary non-polyposis colorectal cancer) undergoes colonoscopy surveillance. A 12 mm flat polyp with central depression is identified in the ascending colon. Biopsy shows high-grade dysplasia within a tubulovillous adenoma. What characteristic feature of colorectal neoplasia in Lynch syndrome most significantly influences the surveillance and management strategy for this patient?
During emergency laparotomy for perforated appendicitis in a 42-year-old man, the surgeon identifies a 2 cm firm nodule at the tip of the appendix. The appendix is grossly inflamed with perforation at the base. Frozen section analysis of the nodule is not available. What is the most appropriate intraoperative management?
A 77-year-old woman with multiple comorbidities including severe COPD, ischaemic heart disease, and chronic kidney disease stage 4 presents with a symptomatic sliding hiatus hernia causing significant dysphagia and aspiration. She also has a large, asymptomatic umbilical hernia measuring 6 cm in diameter that has been present for 5 years without complications. What is the most appropriate management approach for her umbilical hernia?
A 32-year-old man undergoes colonoscopy for investigation of rectal bleeding. Multiple polyps (>100) are identified throughout the colon, ranging from 2-15 mm in size. Several polyps in the sigmoid colon show high-grade dysplasia on biopsy. Genetic testing confirms familial adenomatous polyposis (FAP). Upper GI endoscopy shows multiple duodenal adenomas with the largest measuring 8 mm. What is the most appropriate surgical management of his colorectal disease?
A 67-year-old man with a BMI of 42 kg/m² presents to the emergency department with a 6-hour history of severe pain in his right groin. He has had a known right inguinal hernia for several years but has declined surgery. On examination, there is a tender, tense, irreducible lump in the right groin extending into the scrotum. The overlying skin appears dusky. He is tachycardic at 112 bpm and has a temperature of 38.1°C. What is the most critical factor determining the viability of incarcerated bowel in this strangulated hernia?
General Surgery UK Medical PG Practice Questions and MCQs
Question 171: A 45-year-old woman presents with a 24-hour history of right iliac fossa pain that initially started periumbilically. On examination, she has localised tenderness at McBurney's point. What is the embryological explanation for the initial periumbilical pain in acute appendicitis?
- A. Direct irritation of the parietal peritoneum by the inflamed appendix
- B. Visceral pain from distension of the appendix transmitted via sympathetic nerves to T10 dermatome (Correct Answer)
- C. Stimulation of somatic nerves in the abdominal wall by inflammatory mediators
- D. Referred pain from irritation of the diaphragm by peritoneal fluid
- E. Compression of the superior mesenteric artery by the inflamed appendix
Explanation: ***Visceral pain from distension of the appendix transmitted via sympathetic nerves to T10 dermatome***- The appendix is a **midgut** structure, and early inflammation causes **visceral afferent** fibers to transmit pain signals to the **T10 spinal segment**, corresponding to the **periumbilical** region.- This initial pain is poorly localized and dull because **visceral nerves** respond to stretch and distension rather than direct trauma.*Direct irritation of the parietal peritoneum by the inflamed appendix*- This describes the mechanism for **localized RIFor McBurney's point pain**, which occurs later in the disease progression.- **Parietal peritoneum** is innervated by **somatic nerves**, leading to sharp, well-localized pain rather than periumbilical discomfort.*Stimulation of somatic nerves in the abdominal wall by inflammatory mediators*- Somatic stimulation occurs only when the inflammation spreads to the **parietal peritoneum** or the **abdominal wall**.- This mechanism explains **rebound tenderness** and guarding, not the initial referred periumbilical pain.*Referred pain from irritation of the diaphragm by peritoneal fluid*- Diaphragmatic irritation typically refers pain to the **shoulder (C3-C5 dermatomes)** via the **phrenic nerve**.- This is commonly seen in **ruptured ectopic pregnancy** or perforated peptic ulcers, not early appendicitis.*Compression of the superior mesenteric artery by the inflamed appendix*- An inflamed appendix is too small to compress the **superior mesenteric artery**, and such compression would cause **mesenteric ischemia**.- Ischemic bowel pain is typically **constant and severe**, which does not match the migratory pattern of appendicitis.
Question 172: A 59-year-old man with newly diagnosed sigmoid colon adenocarcinoma undergoes staging CT imaging. The report describes tumour invasion through the muscularis propria into subserosa but not penetrating the visceral peritoneum. There is no lymph node involvement or distant metastases. According to TNM staging, what is the T stage of this tumour?
- A. T1
- B. T2
- C. T3 (Correct Answer)
- D. T4a
- E. T4b
Explanation: ***T3*** - According to TNM staging for colorectal cancer, **T3** represents a tumor that has invaded through the **muscularis propria** into the **subserosa** or non-peritonealized pericolic tissues. - The key feature in this case is the involvement of the subserosa without the penetration of the **visceral peritoneum**. *T1* - A **T1** stage tumor is limited to invasion of the **submucosa** only. - It has not yet reached the thick layer of the **muscularis propria**. *T2* - A **T2** stage tumor indicates invasion into, but not through, the **muscularis propria**. - Since this patient's tumor has reached the subserosa, it has already bypassed the T2 criteria. *T4a* - **T4a** is characterized by the tumor specifically **penetrating the surface** of the visceral peritoneum. - The clinical report explicitly states the tumor has **not penetrated** the visceral peritoneum, excluding this stage. *T4b* - **T4b** describes a tumor that directly **invades or adheres** to other adjacent organs or structures. - There is no evidence in the CT staging of involvement with **neighboring organs** like the bladder or small bowel.
Question 173: A 68-year-old woman undergoes elective repair of a femoral hernia. Which anatomical structure forms the medial border of the femoral canal?
- A. Femoral vein
- B. Inguinal ligament
- C. Lacunar ligament (Correct Answer)
- D. Pectineal ligament
- E. Iliopsoas muscle
Explanation: ***Lacunar ligament***- The **medial border** of the femoral canal is formed by the **lacunar ligament** (Gimbernat's ligament), a triangular expansion of the inguinal ligament.- This rigid boundary is a common site of constriction, making femoral hernias highly prone to **strangulation**.*Femoral vein*- The **femoral vein** forms the **lateral border** of the femoral canal, separating it from the femoral artery.- It lies within the femoral sheath, lateral to the canal, and is not the medial boundary.*Inguinal ligament*- The **inguinal ligament** (Poupart's ligament) forms the **anterior border** (roof) of the femoral canal.- It is formed by the aponeurosis of the **external oblique muscle** and serves as a major landmark.*Pectineal ligament*- The **pectineal ligament** (Cooper’s ligament) forms the **posterior border** (floor) of the femoral canal.- It lies on the superior ramus of the **pubis** and is a key anatomical landmark for surgical repairs.*Iliopsoas muscle*- The **iliopsoas muscle** lies lateral to the femoral sheath and does not directly bound the **femoral canal**.- It forms part of the floor of the **femoral triangle**, but is situated more laterally than the canal itself.
Question 174: A 52-year-old man undergoes an open appendicectomy for acute appendicitis. During the procedure, the appendix is noted to be retrocaecal in position. What percentage of the population has a retrocaecal appendix?
- A. 5-10%
- B. 15-20%
- C. 25-30%
- D. 65-75% (Correct Answer)
- E. 85-90%
Explanation: ***65-75%***- The **retrocaecal** position is the most common anatomical variant of the appendix, occurring in approximately **65-75% of the population**.- Its location behind the **caecum** can lead to variations in symptom presentation, such as **flank pain** or a positive **psoas sign**, making diagnosis challenging.*5-10%*- This range significantly **underestimates** the actual prevalence of the retrocaecal appendix, which is the majority position.- This percentage is more representative of less common appendiceal positions, such as **subcaecal** or **pre-ileal**.*15-20%*- This option is also too **low** to accurately reflect the frequency of the retrocaecal appendix.- The **pelvic** position, which is the second most common, typically accounts for a higher percentage than this range, around 20-30%.*25-30%*- This range is more characteristic of the **pelvic** appendix, which is the second most common anatomical variant.- While common, the pelvic position is still less frequent than the **retrocaecal** position.*85-90%*- This percentage **overestimates** the prevalence of the retrocaecal appendix, which typically peaks around 75%.- While the retrocaecal position is dominant, it does not account for nearly all anatomical variations.
Question 175: A 48-year-old woman presents with recurrent episodes of right iliac fossa pain over 6 months. CT scan incidentally shows an appendix with a dilated, fluid-filled lumen measuring 2.8 cm in diameter with a thin wall and no surrounding inflammation. The appendix has a 'onion-skin' appearance on imaging. No appendicolith is visible. What is the most appropriate management of this imaging finding?
- A. Routine appendicectomy within 6 weeks to prevent future appendicitis
- B. Urgent appendicectomy due to high risk of perforation
- C. Colonoscopy to exclude caecal tumour causing appendiceal obstruction, followed by appendicectomy if negative (Correct Answer)
- D. Interval appendicectomy after course of antibiotics
- E. Reassurance and clinical observation with repeat CT in 6 months
Explanation: ***Colonoscopy to exclude caecal tumour causing appendiceal obstruction, followed by appendicectomy if negative*** - The imaging findings (dilated lumen, thin wall, **'onion-skin' appearance**) are classic for an **appendiceal mucocele**, which is an accumulation of mucus often caused by an obstructive process. - In patients over 40, a **caecal adenocarcinoma** or other colonic neoplasm must be ruled out via **colonoscopy** as it can obstruct the appendiceal orifice and lead to mucocele formation. *Routine appendicectomy within 6 weeks to prevent future appendicitis* - Simple appendicectomy without preoperative investigation of the colon is insufficient, as it may miss a primary **caecal malignancy**. - While surgery is needed to prevent **pseudomyxoma peritonei**, it must be planned with a complete understanding of the underlying cause of the obstruction. *Urgent appendicectomy due to high risk of perforation* - This patient lacks signs of **acute inflammation**, fever, or peritoneal irritation, indicating that urgent or emergency surgery is not required. - **Mucoceles** are typically chronic and do not carry the same immediate risk of spontaneous rupture as acute, infected **suppurative appendicitis**. *Interval appendicectomy after course of antibiotics* - Antibiotics are used to manage **periappendiceal abscesses** or phlegmon, but this case shows a non-inflammatory, fluid-filled lumen consistent with **mucinous accumulation**. - **Antibiotic therapy** does not address the neoplastic potential (cystadenoma or cystadenocarcinoma) or the mechanical obstruction of a mucocele. *Reassurance and clinical observation with repeat CT in 6 months* - Conservative management is inappropriate because a mucocele may be caused by a **malignancy** or may progress to **pseudomyxoma peritonei** if it ruptures. - A mucocele measuring **2.8 cm** is significantly dilated (threshold usually >1.3-1.5 cm) and warrants surgical resection to confirm pathology and prevent complications.
Question 176: A 56-year-old man with Lynch syndrome (hereditary non-polyposis colorectal cancer) undergoes colonoscopy surveillance. A 12 mm flat polyp with central depression is identified in the ascending colon. Biopsy shows high-grade dysplasia within a tubulovillous adenoma. What characteristic feature of colorectal neoplasia in Lynch syndrome most significantly influences the surveillance and management strategy for this patient?
- A. Polyps in Lynch syndrome are typically located in the distal colon and rectum
- B. Adenomas in Lynch syndrome progress to carcinoma more rapidly than sporadic adenomas (Correct Answer)
- C. Colorectal cancers in Lynch syndrome are predominantly right-sided and have better prognosis
- D. Polyps in Lynch syndrome are always polypoid rather than flat or depressed
- E. Lynch syndrome-associated cancers are more responsive to 5-fluorouracil-based chemotherapy
Explanation: ***Adenomas in Lynch syndrome progress to carcinoma more rapidly than sporadic adenomas*** - The **accelerated adenoma-to-carcinoma sequence** is the most critical feature in Lynch syndrome, with malignant transformation potentially occurring in **1-3 years**, significantly faster than the 10-15 years seen in sporadic adenomas. - This rapid progression necessitates aggressive surveillance strategies, typically involving **colonoscopy every 1-2 years**, to ensure early detection and removal of high-risk lesions. *Polyps in Lynch syndrome are typically located in the distal colon and rectum* - Colorectal cancers and polyps in **Lynch syndrome** have a well-established predilection for the **proximal (right) colon**, not the distal colon or rectum. - A distal location is more common in sporadic colorectal cancer or other familial syndromes like Familial Adenomatous Polyposis (FAP). *Colorectal cancers in Lynch syndrome are predominantly right-sided and have better prognosis* - While it is true that these cancers are often **right-sided**, and **microsatellite instability (MSI-H)** may be associated with a **better prognosis** in early stages, this does not directly influence the surveillance frequency. - The primary driver for intensive surveillance is the **speed of adenoma-carcinoma progression**, not the ultimate prognosis of an established cancer. *Polyps in Lynch syndrome are always polypoid rather than flat or depressed* - The case explicitly describes a **flat polyp with central depression**, which is a common and often more insidious morphology for lesions in **Lynch syndrome**. - This morphology makes them harder to detect and contradicts the assertion that they are
Question 177: During emergency laparotomy for perforated appendicitis in a 42-year-old man, the surgeon identifies a 2 cm firm nodule at the tip of the appendix. The appendix is grossly inflamed with perforation at the base. Frozen section analysis of the nodule is not available. What is the most appropriate intraoperative management?
- A. Perform appendicectomy only and await formal histopathology
- B. Perform right hemicolectomy immediately given the risk of carcinoid tumour
- C. Perform appendicectomy with 2 cm margins of caecum
- D. Obtain multiple biopsies of the nodule and close after thorough peritoneal lavage
- E. Perform appendicectomy and formal right hemicolectomy as a planned second procedure if indicated by histology (Correct Answer)
Explanation: ***Perform appendicectomy and formal right hemicolectomy as a planned second procedure if indicated by histology*** - In the setting of **emergency surgery** for perforated appendicitis, the primary goal is source control; an immediate **right hemicolectomy** is risky without **histological confirmation** of malignancy, due to increased morbidity. - A suspicious **2 cm nodule** requires definitive histopathology to guide further management, especially considering the potential for **lymph node metastasis** with tumors of this size, making a staged approach the safest and most oncologically sound strategy. *Perform appendicectomy only and await formal histopathology* - While appendicectomy is essential for the perforation, simply awaiting histopathology without a plan for further intervention for a **2 cm mass** is incomplete, as this size often necessitates additional surgery. - Tumors **2 cm or larger** are associated with a significant risk of **nodal metastasis** (up to 30%), requiring subsequent **right hemicolectomy** if malignancy is confirmed. *Perform right hemicolectomy immediately given the risk of carcinoid tumour* - Performing a major resection like a **right hemicolectomy** in the presence of **perforation** and **sepsis** carries a high risk of **anastomotic leak** and other postoperative complications. - A firm nodule could be an **inflammatory mass** or abscess, not necessarily a **neuroendocrine tumor (NET)**, making immediate radical surgery potentially unnecessary without definitive pathology. *Perform appendicectomy with 2 cm margins of caecum* - This approach, often referred to as a **wedge resection** of the caecum, is generally reserved for very small (< 2 cm) tumors specifically located at the **appendiceal base** to achieve clear margins. - For a **2 cm nodule at the tip** of the appendix, a limited caecal resection is inadequate for oncologic clearance, as the primary concern is potential **lymphatic spread** that would necessitate a formal hemicolectomy. *Obtain multiple biopsies of the nodule and close after thorough peritoneal lavage* - Obtaining biopsies alone is insufficient because the **inflamed and perforated appendix** must be removed immediately to control infection and prevent further peritoneal contamination. - Standard surgical practice for suspected **appendiceal neoplasms** is complete resection (appendicectomy) rather than incisional biopsy to avoid potential tumor seeding or an incomplete diagnostic assessment.
Question 178: A 77-year-old woman with multiple comorbidities including severe COPD, ischaemic heart disease, and chronic kidney disease stage 4 presents with a symptomatic sliding hiatus hernia causing significant dysphagia and aspiration. She also has a large, asymptomatic umbilical hernia measuring 6 cm in diameter that has been present for 5 years without complications. What is the most appropriate management approach for her umbilical hernia?
- A. Urgent repair of the umbilical hernia due to high risk of complications in elderly patients
- B. Conservative management with reassurance and observation unless complications develop (Correct Answer)
- C. Elective mesh repair of the umbilical hernia at the same time as hiatus hernia repair
- D. Laparoscopic umbilical hernia repair to minimise perioperative morbidity
- E. Primary suture repair without mesh given her multiple comorbidities
Explanation: ***Conservative management with reassurance and observation unless complications develop*** - This patient presents with multiple severe comorbidities (**severe COPD**, **IHD**, and **CKD stage 4**) which place her at an extremely high **perioperative risk** for elective procedures. - An **asymptomatic** umbilical hernia that has been stable for five years carries a low risk of acute strangulation compared to the significant morbidity associated with surgery in her clinical state. *Urgent repair of the umbilical hernia due to high risk of complications in elderly patients* - **Urgent repair** is only indicated for patients with signs of **incarceration**, **strangulation**, or bowel obstruction, which are absent here. - Age alone is not a primary driver for urgency; the procedural risk in an elderly patient with **multimorbidity** outweighs the benefit of prophylactic repair. *Elective mesh repair of the umbilical hernia at the same time as hiatus hernia repair* - Combining procedures increases **operative time** and physiological stress, which can be fatal for a patient with severe **respiratory** and **renal insufficiency**. - The priority is the **symptomatic hiatus hernia**; an elective repair of an unrelated asymptomatic site should be avoided to minimize anesthesia duration. *Laparoscopic umbilical hernia repair to minimise perioperative morbidity* - While **laparoscopy** can minimize incision size, it requires **pneumoperitoneum**, which can severely compromise cardiorespiratory function in patients with **severe COPD**. - No surgical technique justifies elective intervention in a high-risk patient whose hernia remains asymptomatic and stable. *Primary suture repair without mesh given her multiple comorbidities* - **Primary suture repair** for a 6 cm defect has high **recurrence rates** compared to mesh repair, making it a poor choice if surgery were actually indicated. - Regardless of the technique, the patient's baseline **comorbidities** outweigh the benefits of correcting a non-problematic hernia.
Question 179: A 32-year-old man undergoes colonoscopy for investigation of rectal bleeding. Multiple polyps (>100) are identified throughout the colon, ranging from 2-15 mm in size. Several polyps in the sigmoid colon show high-grade dysplasia on biopsy. Genetic testing confirms familial adenomatous polyposis (FAP). Upper GI endoscopy shows multiple duodenal adenomas with the largest measuring 8 mm. What is the most appropriate surgical management of his colorectal disease?
- A. Annual colonoscopic surveillance with polypectomy of large polyps
- B. Segmental colectomy removing only the areas with high-grade dysplasia
- C. Total proctocolectomy with end ileostomy
- D. Subtotal colectomy with ileorectal anastomosis and rectal surveillance
- E. Total proctocolectomy with ileal pouch-anal anastomosis (IPAA) (Correct Answer)
Explanation: ***Total proctocolectomy with ileal pouch-anal anastomosis (IPAA)*** - In a young patient with **Familial Adenomatous Polyposis (FAP)** and existing **high-grade dysplasia**, this is the gold standard as it removes all at-risk colorectal mucosa while preserving fecal continence. - It prevents the 100% lifetime risk of **colorectal cancer** associated with the **APC gene** mutation without the need for a permanent stoma. *Annual colonoscopic surveillance with polypectomy of large polyps* - This approach is insufficient because the polyp burden (>100) and the presence of **high-grade dysplasia** make malignant transformation highly likely and imminent. - Surveillance is generally reserved for patients **pre-puberty** or those with attenuated FAP, not for confirmed classic FAP with advanced dysplasia. *Segmental colectomy removing only the areas with high-grade dysplasia* - This is inappropriate because the entire colonic and rectal mucosa carries the **germline mutation** and will inevitably develop more polyps and cancer. - FAP management requires **prophylactic removal** of all susceptible colonic tissue, not just localized resection of current lesions. *Total proctocolectomy with end ileostomy* - While it removes the cancer risk, a permanent **end ileostomy** is typically avoided in young, fit patients when a functional **IPAA reconstruction** is feasible. - This procedure is usually reserved for patients with poor **sphincter function** or very low rectal cancers where a pouch cannot be safely constructed. *Subtotal colectomy with ileorectal anastomosis and rectal surveillance* - This leaves the **rectum in situ**, carrying a significant (up to 25%) long-term risk of **rectal stump cancer**, necessitating frequent lifetime endoscopic monitoring. - This option is generally considered only if there is minimal rectal involvement (fewer than 15–20 polyps) and the patient is highly compliant with follow-up.
Question 180: A 67-year-old man with a BMI of 42 kg/m² presents to the emergency department with a 6-hour history of severe pain in his right groin. He has had a known right inguinal hernia for several years but has declined surgery. On examination, there is a tender, tense, irreducible lump in the right groin extending into the scrotum. The overlying skin appears dusky. He is tachycardic at 112 bpm and has a temperature of 38.1°C. What is the most critical factor determining the viability of incarcerated bowel in this strangulated hernia?
- A. The duration of symptoms prior to presentation
- B. The adequacy of venous drainage from the incarcerated bowel (Correct Answer)
- C. The presence or absence of bowel sounds on auscultation
- D. The size of the hernia defect in relation to the herniated contents
- E. The patient's body mass index and degree of obesity
Explanation: ***The adequacy of venous drainage from the incarcerated bowel*** - In a **strangulated hernia**, the pathophysiology begins with **venous congestion** as the low-pressure venous return is compromised before high-pressure arterial inflow. - Impaired venous drainage leads to **oedema**, increased wall pressure, and subsequent arterial occlusion, which is the primary driver of **ischemic necrosis**. *The duration of symptoms prior to presentation* - While longer duration correlates with a higher risk of **bowel infarction**, it is the pathophysiological compromise of blood flow, not time alone, that dictates viability. - Some hernias may present early but have rapid **ischemic changes** due to the tightness of the hernial ring. *The presence or absence of bowel sounds on auscultation* - **Bowel sounds** are unreliable indicators of strangulation; they may be hyperactive in early **intestinal obstruction** or absent in late stages. - The clinical diagnosis of strangulation is based on **irreducibility**, tenderness, and signs of systemic inflammation like **tachycardia** and fever. *The size of the hernia defect in relation to the herniated contents* - A **small, rigid defect** increases the risk that a hernia will become incarcerated or strangulated, but it does not determine the viability of the tissue once trapped. - Conversely, large defects can still cause strangulation if the volume of **herniated contents** leads to tight compression at the neck. *The patient's body mass index and degree of obesity* - High **BMI** makes the physical examination and surgical access more challenging but does not directly influence the biological viability of the **ischemic bowel**. - Obesity may delay presentation because a **tense lump** might be harder to palpate under a large panniculus.
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