A 42-year-old man undergoes emergency laparoscopic appendicectomy for perforated appendicitis. Intraoperatively, the surgeon notes extensive inflammation and a 2cm abscess cavity in the right iliac fossa. The appendix is successfully removed. Postoperatively, what is the most appropriate antibiotic regimen?
Q92
A 58-year-old man presents to the emergency department with a 6-hour history of sudden onset severe pain in the right groin. On examination, there is a tender, tense, irreducible swelling below and lateral to the pubic tubercle. The overlying skin appears dusky. His heart rate is 105 bpm and temperature 37.9°C. What is the most appropriate immediate management?
Q93
A 34-year-old woman presents to the emergency department with a 16-hour history of right iliac fossa pain, fever of 38.2°C, and vomiting. She is 10 weeks pregnant. Examination reveals tenderness and guarding in the right iliac fossa. Blood tests show WCC 14.5 × 10⁹/L and CRP 62 mg/L. What is the most appropriate initial imaging investigation?
Q94
A 47-year-old man undergoes colonoscopy for iron deficiency anaemia. A 3.5cm ulcerated lesion is identified in the ascending colon and biopsies confirm adenocarcinoma. Staging CT shows the tumour extending into the pericolic fat with no lymphadenopathy or distant metastases. What is the appropriate surgical procedure?
Q95
A 32-year-old woman presents with a 28-hour history of right iliac fossa pain, nausea, and anorexia. Her temperature is 37.8°C and she has guarding over the right lower quadrant. Blood tests show WCC 13.2 × 10⁹/L and CRP 45 mg/L. An Alvarado score is calculated to help determine the need for imaging. Which component is NOT part of the Alvarado scoring system?
Q96
A 68-year-old man with newly diagnosed sigmoid colon adenocarcinoma undergoes staging CT scan which shows a 4cm mass in the sigmoid colon with invasion through the muscularis propria into the pericolonic tissue. Four out of twelve lymph nodes are positive for metastatic disease. There is no evidence of distant metastases. According to the TNM classification (8th edition), what is the correct staging?
Q97
A 56-year-old man undergoes elective open mesh repair of a right inguinal hernia. During the procedure, the surgeon identifies and preserves three nerves in the inguinal region to prevent postoperative chronic pain. Which nerve is at greatest risk of injury during dissection of the superficial inguinal ring?
Q98
A 22-year-old man presents to the emergency department with a 24-hour history of right iliac fossa pain and fever. CT scan confirms acute appendicitis with an appendix measuring 14mm in diameter. During laparoscopic appendicectomy, the surgeon notes inflammation at McBurney's point. What is the anatomical location of McBurney's point?
Q99
A 52-year-old man undergoes elective anterior resection for a sigmoid colon adenocarcinoma. On postoperative day 5, he develops increasing abdominal pain, fever of 38.9°C, tachycardia of 115 bpm, and his drain output changes from serosanguinous to turbid brown fluid. Blood tests show WCC 18.3 × 10⁹/L, CRP 245 mg/L, and lactate 2.8 mmol/L. A CT scan with water-soluble contrast is performed which shows an anastomotic leak with a contained 4 cm pelvic collection but no free intraperitoneal gas or generalized peritonitis. His abdomen is tender in the suprapubic region but soft elsewhere, with no signs of septic shock. According to current classification systems and management algorithms, what is the most appropriate initial management?
Q100
A 41-year-old man presents to the emergency department with a 20-hour history of severe right iliac fossa pain, fever of 38.6°C, and vomiting. Blood tests show WCC 17.2 × 10⁹/L, CRP 156 mg/L, and creatinine 142 μmol/L (baseline 85 μmol/L). CT abdomen and pelvis with IV contrast demonstrates a perforated appendix with a 7 cm pericaecal abscess and free fluid in the pelvis, but no generalized peritonitis. On examination, he has localised tenderness and guarding in the right iliac fossa but his abdomen is soft elsewhere. Understanding the evidence from recent randomised controlled trials, what is the most appropriate initial management?
General Surgery UK Medical PG Practice Questions and MCQs
Question 91: A 42-year-old man undergoes emergency laparoscopic appendicectomy for perforated appendicitis. Intraoperatively, the surgeon notes extensive inflammation and a 2cm abscess cavity in the right iliac fossa. The appendix is successfully removed. Postoperatively, what is the most appropriate antibiotic regimen?
A. Single dose of intravenous co-amoxiclav at induction only
B. Intravenous co-amoxiclav for 24 hours, then switch to oral antibiotics for 5 days total
C. Intravenous co-amoxiclav and metronidazole for 5 days
D. Intravenous co-amoxiclav and metronidazole for 24-48 hours, then oral antibiotics to complete 5 days total (Correct Answer)
E. No postoperative antibiotics required if adequate source control achieved
Explanation: ***Intravenous co-amoxiclav and metronidazole for 24-48 hours, then oral antibiotics to complete 5 days total***- This regimen is appropriate for **perforated appendicitis** with an **abscess**, as it provides initial broad-spectrum coverage for both **aerobic** (co-amoxiclav) and **anaerobic** (metronidazole) bacteria.- A short course (24-48 hours) of IV antibiotics followed by an oral switch to complete 5 days total is supported by evidence for **complicated intra-abdominal infections** in stable patients, minimizing hospital stay and IV complications.*Single dose of intravenous co-amoxiclav at induction only*- A single dose of antibiotics is suitable for **prophylaxis** in **uncomplicated appendicitis**, where there is no perforation or abscess.- In **perforated appendicitis** with an **abscess**, the infection is established and requires a **therapeutic course** of antibiotics, not just prophylaxis.*Intravenous co-amoxiclav for 24 hours, then switch to oral antibiotics for 5 days total*- While the IV duration and total duration are reasonable, **co-amoxiclav alone** lacks robust **anaerobic coverage**, which is crucial for **intra-abdominal infections** like perforated appendicitis.- The presence of a **perforated appendix** and **abscess** necessitates coverage against common anaerobic pathogens, typically achieved with **metronidazole**.*Intravenous co-amoxiclav and metronidazole for 5 days*- While this combination provides appropriate **broad-spectrum coverage**, continuing **intravenous antibiotics** for the entire 5 days is usually unnecessary once the patient is stable and tolerating oral intake.- A planned **IV-to-oral switch** reduces the risk of **IV-related complications**, decreases hospital costs, and facilitates earlier discharge without compromising efficacy.*No postoperative antibiotics required if adequate source control achieved*- Even with **adequate source control** (appendicectomy and abscess drainage), **perforated appendicitis** with an abscess involves significant **peritoneal contamination**.- Omitting postoperative antibiotics in such cases significantly increases the risk of **postoperative infections**, including **intra-abdominal abscesses** and **sepsis**.
Question 92: A 58-year-old man presents to the emergency department with a 6-hour history of sudden onset severe pain in the right groin. On examination, there is a tender, tense, irreducible swelling below and lateral to the pubic tubercle. The overlying skin appears dusky. His heart rate is 105 bpm and temperature 37.9°C. What is the most appropriate immediate management?
A. Attempt manual reduction with analgesia and sedation
B. Emergency surgical exploration and repair within 2 hours (Correct Answer)
C. CT scan of abdomen and pelvis to confirm diagnosis
D. Admit for observation with nasogastric decompression and intravenous fluids
E. Urgent ultrasound Doppler to assess vascular compromise
Explanation: ***Emergency surgical exploration and repair within 2 hours*** - The patient presents with clinical signs of a **strangulated femoral hernia**, characterized by an irreducible, tender, tense mass below and lateral to the **pubic tubercle**, with ominous signs like **dusky skin**, **tachycardia**, and **low-grade fever**. - This clinical picture mandates **immediate surgical exploration** to prevent **bowel ischemia**, necrosis, and subsequent **perforation** and **sepsis**, making time to intervention critical. *Attempt manual reduction with analgesia and sedation* - Manual reduction is **contraindicated** in cases of suspected **strangulation** because it risks reducing **necrotic bowel** into the abdominal cavity, leading to missed ischemia and peritonitis. - Forcing a strangulated hernia back can also cause **perforation** of compromised bowel, increasing morbidity and mortality. *CT scan of abdomen and pelvis to confirm diagnosis* - A **clinical diagnosis** of a strangulated hernia, based on the presenting signs and symptoms, is sufficient to proceed with **emergency surgery**. - Performing a CT scan would introduce an **unacceptable delay** in definitive management, significantly increasing the risk of **bowel infarction** and the need for **bowel resection**. *Admit for observation with nasogastric decompression and intravenous fluids* - Conservative management with observation, nasogastric decompression, and fluids is **inappropriate** for a strangulated hernia, as it fails to address the underlying mechanical obstruction and vascular compromise. - Delaying surgical intervention in strangulation leads to rapid progression of **ischemia**, potentially resulting in **bowel gangrene**, **perforation**, and **life-threatening sepsis**. *Urgent ultrasound Doppler to assess vascular compromise* - While ultrasound can assess vascularity, clinical signs such as **dusky skin** and severe localized tenderness already strongly suggest **vascular compromise** and **strangulation**. - Delaying **emergency surgical exploration** for an ultrasound to confirm a clinically evident strangulation is detrimental and could lead to worse patient outcomes.
Question 93: A 34-year-old woman presents to the emergency department with a 16-hour history of right iliac fossa pain, fever of 38.2°C, and vomiting. She is 10 weeks pregnant. Examination reveals tenderness and guarding in the right iliac fossa. Blood tests show WCC 14.5 × 10⁹/L and CRP 62 mg/L. What is the most appropriate initial imaging investigation?
A. CT scan of the abdomen and pelvis with intravenous contrast
B. Transvaginal ultrasound followed by transabdominal ultrasound
C. MRI pelvis without contrast
D. Abdominal ultrasound with graded compression (Correct Answer)
E. Plain abdominal radiograph
Explanation: ***Abdominal ultrasound with graded compression***- This technique is the **first-line imaging modality** for suspected appendicitis in **pregnancy** as it avoids exposing the fetus to ionizing radiation.- It utilizes a **non-invasive** method to identify an appendix diameter **>6mm**, non-compressibility, or an appendicolith while displacing bowel gas.*CT scan of the abdomen and pelvis with intravenous contrast*- While highly sensitive for appendicitis, CT involves **ionizing radiation** which poses potential risks to the fetus and is generally avoided in pregnancy.- It is usually reserved as a last resort if other non-ionizing modalities like **ultrasound and MRI** are inconclusive or unavailable.*Transvaginal ultrasound followed by transabdominal ultrasound*- **Transvaginal ultrasound** is tailored for pelvic/gynecological pathology (like ectopic pregnancy) but is not the standard protocol for diagnosing **acute appendicitis**.- **Graded compression** transabdominal ultrasound is the specific technique required to visualize the inflammatory changes of the appendix.*MRI pelvis without contrast*- This is the **second-line investigation** if ultrasound is non-diagnostic or inconclusive during pregnancy.- While it offers excellent **soft tissue resolution** without radiation, it is more resource-intensive and less readily available in the emergency setting than **ultrasound**.*Plain abdominal radiograph*- A plain film has **very low sensitivity** and specificity for identifying acute appendicitis and is rarely helpful in this clinical context.- It subjects the patient and fetus to unnecessary, albeit low, **radiation exposure** without diagnostic benefit.
Question 94: A 47-year-old man undergoes colonoscopy for iron deficiency anaemia. A 3.5cm ulcerated lesion is identified in the ascending colon and biopsies confirm adenocarcinoma. Staging CT shows the tumour extending into the pericolic fat with no lymphadenopathy or distant metastases. What is the appropriate surgical procedure?
A. Right hemicolectomy with ileocolic anastomosis (Correct Answer)
B. Extended right hemicolectomy with ileum to descending colon anastomosis
C. Transverse colectomy with colo-colic anastomosis
D. Segmental ascending colon resection
E. Total colectomy with ileorectal anastomosis
Explanation: ***Right hemicolectomy with ileocolic anastomosis***
- This is the standard oncological treatment for **adenocarcinoma of the ascending colon**, involving the removal of the **terminal ileum, caecum, ascending colon**, and **hepatic flexure**.
- The procedure ensures clear margins and adequate **lymphovascular clearance** by ligating the **ileocolic** and **right colic arteries** at their origins, crucial for proper staging and prognosis.
*Extended right hemicolectomy with ileum to descending colon anastomosis*
- This procedure is typically reserved for tumors located at the **hepatic flexure** or the **proximal transverse colon**, requiring a more extensive resection.
- It involves the ligation of the **middle colic artery**, which is unnecessary for a lesion isolated to the **ascending colon**.
*Transverse colectomy with colo-colic anastomosis*
- This procedure is specifically used for tumors located in the **mid-transverse colon**.
- It would not address an **ascending colon** lesion and would not provide the necessary **regional lymphadenectomy** for a tumor in that location.
*Segmental ascending colon resection*
- Segmental resection is considered an **inadequate oncological resection** for colon cancer as it typically fails to remove the regional **lymph node basin** sufficiently.
- A minimum of **12 lymph nodes** must be harvested for accurate staging, which requires a more extensive resection like a formal hemicolectomy.
*Total colectomy with ileorectal anastomosis*
- This extensive surgery is generally reserved for patients with **hereditary polyposis syndromes** or **synchronous tumors** in multiple segments of the colon.
- It is overly aggressive for a localized **Stage II (T3N0M0)** adenocarcinoma of the ascending colon without other indications.
Question 95: A 32-year-old woman presents with a 28-hour history of right iliac fossa pain, nausea, and anorexia. Her temperature is 37.8°C and she has guarding over the right lower quadrant. Blood tests show WCC 13.2 × 10⁹/L and CRP 45 mg/L. An Alvarado score is calculated to help determine the need for imaging. Which component is NOT part of the Alvarado scoring system?
A. Migration of pain to the right iliac fossa
B. Leucocytosis (WCC >10 × 10⁹/L)
C. Rebound tenderness in the right iliac fossa
D. Elevated C-reactive protein (Correct Answer)
E. Left shift of neutrophils
Explanation: ***Elevated C-reactive protein***
- **C-reactive protein (CRP)** is frequently measured in clinical practice but is NOT included in the original **Alvarado score** (MANTRELS).
- While CRP is a sensitive marker for inflammation, the lab components of Alvarado include only **Leucocytosis** and **Left shift**.
*Migration of pain to the right iliac fossa*
- This refers to the classic movement of pain from the periumbilical region to the **Right Iliac Fossa (RIF)**, earning **1 point** in the Alvarado score.
- It is represented by the 'M' in the **MANTRELS** mnemonic used to recall the Alvarado components.
*Leucocytosis (WCC >10 × 10⁹/L)*
- A total White Cell Count (WCC) greater than 10 × 10⁹/L is a crucial component that earns **2 points** in the Alvarado score.
- This is one of the two criteria in the system (along with localized tenderness) that is weighted more heavily.
*Rebound tenderness in the right iliac fossa*
- This clinical sign indicates **peritoneal irritation** in the right lower quadrant and is assigned **1 point** in the Alvarado score.
- It is represented by the 'R' in the **MANTRELS** score abbreviation, indicating a significant finding in acute appendicitis.
*Left shift of neutrophils*
- This refers to an increase in **immature neutrophils** (band forms) and earns **1 point** in the Alvarado score.
- It reflects the body's acute inflammatory response, often seen in bacterial infections like **acute appendicitis**.
Question 96: A 68-year-old man with newly diagnosed sigmoid colon adenocarcinoma undergoes staging CT scan which shows a 4cm mass in the sigmoid colon with invasion through the muscularis propria into the pericolonic tissue. Four out of twelve lymph nodes are positive for metastatic disease. There is no evidence of distant metastases. According to the TNM classification (8th edition), what is the correct staging?
A. T2 N1 M0 (Stage IIIA)
B. T3 N1 M0 (Stage IIIB)
C. T3 N2a M0 (Stage IIIB) (Correct Answer)
D. T4 N2a M0 (Stage IIIC)
E. T3 N2b M0 (Stage IIIC)
Explanation: ***T3 N2a M0 (Stage IIIB)***
- The tumor's invasion through the **muscularis propria** into the **pericolonic tissue** correctly classifies it as **T3** in the TNM system.
- The presence of **four positive regional lymph nodes** out of twelve leads to a **N2a** classification (4-6 positive nodes). In the absence of distant metastasis (**M0**), this combination designates the disease as **Stage IIIB**.
*T2 N1 M0 (Stage IIIA)*
- **T2** is incorrect as it denotes tumor invasion into, but not through, the **muscularis propria**, unlike the description of invasion into the pericolonic tissue.
- **N1** is incorrect because it represents metastasis in **1-3 regional lymph nodes**, whereas the patient has 4 positive nodes.
*T3 N1 M0 (Stage IIIB)*
- While **T3** accurately reflects the tumor's invasion into the **pericolonic tissue**, the nodal staging of N1 is incorrect.
- **N1** signifies metastasis in 1-3 regional lymph nodes; the patient's **4 positive lymph nodes** require an **N2a** classification, not N1.
*T4 N2a M0 (Stage IIIC)*
- **T4** is incorrect as it indicates invasion of the **visceral peritoneum (T4a)** or **adjacent organs (T4b)**, which is not stated in the case details.
- Although **N2a** correctly identifies 4 positive lymph nodes, the incorrect T4 staging would lead to a higher overall stage than warranted by the tumor depth.
*T3 N2b M0 (Stage IIIC)*
- While **T3** correctly describes the tumor's depth of invasion into the **pericolonic tissue**, **N2b** is inaccurate.
- **N2b** is reserved for cases with **7 or more regional lymph nodes** involved, while this patient has only 4 positive nodes, making N2a the correct nodal classification.
Question 97: A 56-year-old man undergoes elective open mesh repair of a right inguinal hernia. During the procedure, the surgeon identifies and preserves three nerves in the inguinal region to prevent postoperative chronic pain. Which nerve is at greatest risk of injury during dissection of the superficial inguinal ring?
A. Genitofemoral nerve
B. Ilioinguinal nerve (Correct Answer)
C. Femoral branch of the genitofemoral nerve
D. Iliohypogastric nerve
E. Lateral femoral cutaneous nerve
Explanation: ***Ilioinguinal nerve***
- The **ilioinguinal nerve** travels through the **inguinal canal** anterior to the spermatic cord and exits through the **superficial inguinal ring**, making it highly vulnerable during dissection.
- Damage to this nerve results in **postoperative chronic pain** or numbness in the **inner thigh**, base of the penis, or the anterior scrotum/labium majus.
*Genitofemoral nerve*
- The **genital branch** of this nerve travels inside the **spermatic cord** (within the internal spermatic fascia) rather than superficial to it at the ring.
- It is responsible for the **cremasteric reflex** and providing sensation to the scrotum or labia majora.
*Femoral branch of the genitofemoral nerve*
- This branch passes deep to the **inguinal ligament** rather than through the inguinal canal or superficial ring.
- It provides sensation to the **anterior upper thigh** skin and is typically not encountered in an open inguinal hernia repair.
*Iliohypogastric nerve*
- This nerve generally runs **superior** and lateral to the superficial inguinal ring, often piercing the **external oblique aponeurosis** above the canal.
- While it provides sensation to the **suprapubic region**, it is less likely to be injured specifically at the superficial ring compared to the ilioinguinal nerve.
*Lateral femoral cutaneous nerve*
- This nerve is located far **laterally**, passing under the inguinal ligament near the **anterior superior iliac spine (ASIS)**.
- It is not at risk during a standard open **inguinal hernia repair** but may be injured during laparoscopic approaches or due to external pressure (Meralgia paresthetica).
Question 98: A 22-year-old man presents to the emergency department with a 24-hour history of right iliac fossa pain and fever. CT scan confirms acute appendicitis with an appendix measuring 14mm in diameter. During laparoscopic appendicectomy, the surgeon notes inflammation at McBurney's point. What is the anatomical location of McBurney's point?
A. One-third of the distance from the anterior superior iliac spine to the umbilicus
B. Two-thirds of the distance from the anterior superior iliac spine to the umbilicus
C. Two-thirds of the distance from the umbilicus to the anterior superior iliac spine (Correct Answer)
D. One-third of the distance from the umbilicus to the pubic symphysis
E. At the midpoint between the anterior superior iliac spine and the pubic symphysis
Explanation: ***Two-thirds of the distance from the umbilicus to the anterior superior iliac spine***
- **McBurney's point** is classically defined as roughly 2 inches or **two-thirds** of the way along a line starting from the **umbilicus** towards the **anterior superior iliac spine (ASIS)**.
- This anatomical landmark corresponds to the usual location of the **base of the appendix**, where it attaches to the **cecum**, and marks the site of maximal tenderness in **acute appendicitis**.
*One-third of the distance from the anterior superior iliac spine to the umbilicus*
- This describes the **same point** but measures from the opposite direction (from the ASIS), which could be a source of confusion.
- While technically the same physical spot, medical nomenclature and exams traditionally define it relative to the distance **from the umbilicus** (two-thirds) or **from the ASIS** (one-third).
*Two-thirds of the distance from the anterior superior iliac spine to the umbilicus*
- If measuring from the **ASIS**, the point would be only **one-third** of the distance away, not two-thirds.
- Placing it two-thirds away from the ASIS would move the point too close to the **umbilicus**, missing the typical site of the **appendix base**.
*One-third of the distance from the umbilicus to the pubic symphysis*
- This area lies in the **midline** or **lower pelvis**, far from the standard location of the **right iliac fossa** and the appendix.
- Tenderness here might suggest **bladder pathology** or pelvic inflammatory disease rather than **appendicitis**.
*At the midpoint between the anterior superior iliac spine and the pubic symphysis*
- This location describes the **midinguinal point**, which is used to identify the **femoral artery** pulse.
- It is located significantly **inferior** to McBurney's point and is an incorrect landmark for evaluating the **caecal appendix**.
Question 99: A 52-year-old man undergoes elective anterior resection for a sigmoid colon adenocarcinoma. On postoperative day 5, he develops increasing abdominal pain, fever of 38.9°C, tachycardia of 115 bpm, and his drain output changes from serosanguinous to turbid brown fluid. Blood tests show WCC 18.3 × 10⁹/L, CRP 245 mg/L, and lactate 2.8 mmol/L. A CT scan with water-soluble contrast is performed which shows an anastomotic leak with a contained 4 cm pelvic collection but no free intraperitoneal gas or generalized peritonitis. His abdomen is tender in the suprapubic region but soft elsewhere, with no signs of septic shock. According to current classification systems and management algorithms, what is the most appropriate initial management?
A. Emergency laparotomy, anastomotic resection, and formation of end colostomy (Hartmann's procedure)
B. CT-guided percutaneous drainage of collection, IV antibiotics, and close observation (Correct Answer)
C. Endoscopic assessment and placement of endoluminal vacuum-assisted closure (VAC) device
D. Conservative management with IV antibiotics alone, as the leak is contained
E. Immediate return to theatre for laparoscopic lavage and drainage only, preserving the anastomosis
Explanation: ***CT-guided percutaneous drainage of collection, IV antibiotics, and close observation***
- The patient's presentation with a contained 4 cm pelvic collection, fever, and inflammatory markers, but no generalized peritonitis or septic shock, signifies a **Grade B anastomotic leak**.
- For a **Grade B leak**, the most appropriate initial management involves **source control** via percutaneous drainage of the collection, combined with broad-spectrum **intravenous antibiotics**, and close clinical monitoring.
*Emergency laparotomy, anastomotic resection, and formation of end colostomy (Hartmann's procedure)*
- This radical surgical intervention is reserved for **Grade C anastomotic leaks**, characterized by **generalized peritonitis**, diffuse free intraperitoneal gas, or signs of **septic shock**.
- Performing a **Hartmann's procedure** in a hemodynamically stable patient with a localized contained leak would be an unnecessarily aggressive approach with higher morbidity.
*Endoscopic assessment and placement of endoluminal vacuum-assisted closure (VAC) device*
- **Endoluminal VAC therapy** is a specialized technique often used for **rectal anastomotic leaks** or in cases of **chronic or refractory leaks** where less invasive options have failed or are unsuitable.
- It is generally not the first-line treatment for an acute, symptomatic 4 cm contained collection requiring immediate drainage for source control.
*Conservative management with IV antibiotics alone, as the leak is contained*
- While the leak is contained, a **symptomatic 4 cm collection** with significant inflammatory response (fever, high WCC, CRP, lactate) mandates physical drainage for effective **source control**, which antibiotics alone cannot achieve.
- Purely conservative management with only antibiotics is typically reserved for **Grade A leaks**, which are asymptomatic and often discovered incidentally.
*Immediate return to theatre for laparoscopic lavage and drainage only, preserving the anastomosis*
- Returning to the operating room carries more risks than a CT-guided percutaneous drainage for a **well-contained pelvic collection** in a stable patient.
- **Laparoscopic lavage** is more appropriate for diffuse peritoneal contamination rather than a localized abscess that can be managed percutaneously.
Question 100: A 41-year-old man presents to the emergency department with a 20-hour history of severe right iliac fossa pain, fever of 38.6°C, and vomiting. Blood tests show WCC 17.2 × 10⁹/L, CRP 156 mg/L, and creatinine 142 μmol/L (baseline 85 μmol/L). CT abdomen and pelvis with IV contrast demonstrates a perforated appendix with a 7 cm pericaecal abscess and free fluid in the pelvis, but no generalized peritonitis. On examination, he has localised tenderness and guarding in the right iliac fossa but his abdomen is soft elsewhere. Understanding the evidence from recent randomised controlled trials, what is the most appropriate initial management?
A. Emergency appendicectomy within 6 hours
B. CT-guided percutaneous drainage of abscess, IV antibiotics, with interval appendicectomy in 6-8 weeks
C. CT-guided percutaneous drainage of abscess and IV antibiotics, with no planned interval appendicectomy (Correct Answer)
D. IV antibiotics alone with close observation, proceeding to surgery only if no improvement in 48 hours
E. Emergency right hemicolectomy to ensure complete source control
Explanation: ***CT-guided percutaneous drainage of abscess and IV antibiotics, with no planned interval appendicectomy***
- For a **contained abscess** larger than 3-5 cm without generalized peritonitis, **percutaneous drainage** and antibiotics are the current gold standard to allow inflammation to resolve.
- Recent clinical evidence shows that routine **interval appendicectomy** is unnecessary as the risk of recurrence is low (10-20%), and surgery is reserved only for recurrent symptoms or suspected malignancy.
*Emergency appendicectomy within 6 hours*
- Surgery in the presence of a **contained abscess** and significant inflammation is associated with higher rates of **bowel resection** and surgical site infections.
- It is generally avoided unless the patient has signs of **generalized peritonitis** or fails to respond to conservative management.
*CT-guided percutaneous drainage of abscess, IV antibiotics, with interval appendicectomy in 6-8 weeks*
- Although this was historical practice, modern trials suggest that **routine interval appendicectomy** does not provide additional benefit for most patients.
- This approach subjects the patient to the risks of a second procedure when the majority (80-90%) will never experience **recurrent appendicitis**.
*IV antibiotics alone with close observation, proceeding to surgery only if no improvement in 48 hours*
- While appropriate for small phlegmons, **antibiotics alone** are often insufficient for a large **7 cm abscess**, which requires active source control via drainage.
- Delaying drainage in the presence of a large collection and **acute kidney injury** (elevated creatinine) may lead to clinical deterioration.
*Emergency right hemicolectomy to ensure complete source control*
- This is an **overly morbid** and radical intervention for a localized perforated appendicitis without evidence of caecal malignancy or necrosis.
- Such extensive surgery is a last resort and unnecessary when **percutaneous drainage** can control the source effectively.
