Colorectal Surgery Practice Questions

Q: What is the most appropriate management for a patient with confirmed diverticulitis and an abscess larger than 4 cm?

Percutaneous drainage. ***Percutaneous drainage*** - For diverticulitis with an abscess larger than 4 cm, **percutaneous drainage** is the most appropriate initial management to control the infection and prevent progression to more severe complications. - This procedure removes infected fluid, reducing the **bacterial load** and improving the patient's clinical condition, often followed by antibiotics. *Antibiotic therapy alone* - While antibiotics are crucial for treating diverticulitis, they are often insufficient for abscesses larger than **4 cm** due to poor penetration into the abscess cavity. - Relying solely on antibiotics for a large abscess can lead to treatment failure, persistence of infection, or even **sepsis**. *Immediate colectomy* - **Immediate colectomy** is generally reserved for complicated diverticulitis with **perforation**, generalized peritonitis, or uncontained infection, which is not indicated here as the primary management for an abscess that can be drained. - An immediate colectomy carries higher risks of **morbidity and mortality** compared to less invasive approaches like percutaneous drainage. *Observation and diet modification* - **Observation and diet modification** are appropriate for uncomplicated diverticulitis or after resolution of an acute episode, but not for an active abscess. - An abscess requires active intervention due to the risk of **rupture**, sepsis, and other life-threatening complications.

Q: A patient presents with acute onset of left-sided lower abdominal pain and a palpable mass. A CT scan shows thickening of the sigmoid colon with surrounding inflammation. What is the most likely diagnosis?

Diverticulitis. ***Diverticulitis*** - Acute onset **left-sided lower abdominal pain** and a **palpable mass** are classic signs, as diverticula most commonly occur in the sigmoid colon. - **CT findings** of sigmoid colon thickening with surrounding inflammation directly point to inflammation and infection of diverticula. *Colon cancer* - While it can cause a **palpable mass** and sometimes pain, the acute inflammatory presentation and CT findings are less typical than for diverticulitis. - Often presents with insidious symptoms such as **changes in bowel habits**, rectal bleeding, or weight loss. *Ischemic colitis* - Characterized by acute abdominal pain, often with **bloody diarrhea**, particularly in older patients with vascular risk factors. - CT usually shows **bowel wall thickening**, but often with characteristic **thumbprinting** and less prominent surrounding inflammation compared to diverticulitis. *Crohn's disease* - A chronic inflammatory condition that can affect any part of the GI tract, often causing **abdominal pain**, diarrhea, and weight loss. - While it can cause bowel wall thickening and inflammation, an acute, isolated presentation in the sigmoid colon with a palpable mass is less characteristic than the typical presentation of **skip lesions** or **transmural inflammation** in other bowel segments.

Q: A 60-year-old man presents with progressive fatigue. Laboratory results reveal microcytic anemia, and a colonoscopy shows a mass. Which type of colon cancer is most commonly associated with this presentation?

Ascending colon carcinoma. ***Ascending colon carcinoma*** - Carcinomas in the **right (ascending) colon** often present with **occult bleeding** leading to **iron deficiency anemia** (microcytic anemia), and subtle symptoms like fatigue, making them harder to detect until advanced [1]. - The wider lumen and more liquid stool in the ascending colon allow tumors to grow larger before causing obstructive symptoms [1]. *Sigmoid colon carcinoma* - **Sigmoid colon cancers** are distal and typically present with symptoms related to **obstruction**, changes in bowel habits, or more overt rectal bleeding due to the narrower lumen and more formed stool [1]. - While they can cause anemia, it's less commonly the sole or primary presenting symptom compared to right-sided lesions [1]. *Rectal carcinoma* - **Rectal cancers** commonly present with symptoms such as **hematochezia** (bright red blood per rectum), tenesmus, or changes in stool caliber [1]. - While they can also lead to anemia, their proximity to the anus often causes more immediate and noticeable bleeding symptoms [1]. *Descending colon carcinoma* - Similar to sigmoid colon cancers, **descending colon carcinomas** tend to cause symptoms related to **partial obstruction**, such as changes in bowel habits, abdominal pain, or tenesmus. - They are less frequently associated with occult bleeding and microcytic anemia as the primary presentation compared to right-sided lesions.

Q: What is the first-line treatment for a patient diagnosed with acute diverticulitis without complications?

Antibiotics. ***Antibiotics*** - For **uncomplicated acute diverticulitis**, antibiotics covering common enteric bacteria (e.g., gram-negative rods and anaerobes) have traditionally been the first-line treatment. - This approach aims to reduce inflammation and prevent progression to complications like abscess formation or perforation. - **Note:** Recent evidence (AVOD, DIABOLO trials) suggests selective antibiotic use in truly uncomplicated cases, but antibiotics remain standard in most protocols, especially with fever, leukocytosis, or comorbidities. *Immediate surgery* - **Immediate surgery** is generally reserved for **complicated diverticulitis**, such as perforation with peritonitis, large abscess (>4cm), fistula, or obstruction. - It is not indicated for uncomplicated cases as a first-line treatment. - Elective surgery may be considered after recurrent episodes. *Probiotics* - While probiotics may have a role in gut health maintenance, there is **insufficient evidence** to support their use as a primary treatment for acute diverticulitis. - They are not a substitute for antibiotics or supportive care in managing the acute inflammatory process. *Dietary modification* - **Dietary modification** (clear liquids or low-residue diet during acute flare-ups, followed by high-fiber diet for prevention) is an important **supportive measure** and plays a role in management. - However, in the context of traditional teaching and most examination standards, antibiotics are considered the primary therapeutic intervention for acute inflammation, with dietary changes serving as adjunctive therapy. - Modern evidence supports conservative management with dietary modification alone in select uncomplicated cases.

Q: A 70-year-old male presents with abdominal pain and weight loss. A barium enema shows an 'apple core' lesion. What is the most likely diagnosis?

Colon cancer. ***Colon cancer*** - An **'apple core' lesion** on a barium enema is a classic radiographic sign highly suggestive of an obstructing **colorectal carcinoma** [1]. - The patient's age combined with **abdominal pain** and **weight loss** are common symptoms of advanced colon cancer [1]. *Diverticulosis* - Characterized by the presence of **diverticula** (outpouchings) in the colon, which are not typically associated with an 'apple core' lesion. - While diverticulosis can cause abdominal pain, **weight loss** is not a common associated symptom. *Crohn's disease* - Often presents with **skip lesions**, **transmural inflammation**, and sometimes **strictures**, but not typically an 'apple core' appearance [2]. - While it can cause abdominal pain and weight loss, it is more common in younger patients and has distinct endoscopic and histological features [2]. *Ulcerative colitis* - Involves **continuous inflammation** of the colon, starting from the rectum, and is characterized by mucosal rather than transmural involvement. - It does not present with an 'apple core' lesion and often causes bloody diarrhea, which is not mentioned in this case.

Q: What is the critical diameter of the caecum when perforation is considered imminent in pseudo-obstruction?

9 cm. ***9 cm*** - A cecal diameter of **9-12 cm** is the critical threshold beyond which the risk of **perforation** in pseudo-obstruction becomes imminent. - This is based on **Laplace's Law**: wall tension is proportional to radius, making larger diameter bowel more susceptible to perforation. - At 9 cm, aggressive management including decompression should be strongly considered to prevent perforation. *7 cm* - While representing colonic dilatation, **7 cm** is below the critical threshold for imminent perforation. - This diameter typically warrants monitoring but does not necessitate immediate aggressive intervention. *8 cm* - A cecal diameter of **8 cm** indicates significant dilatation with increased risk. - Usually managed with close observation and conservative measures before considering urgent decompression. - Perforation risk rises sharply as diameter approaches 9 cm. *10 cm* - A diameter of **10 cm** definitely signifies imminent perforation risk requiring immediate intervention. - However, **9 cm** is recognized as the lower end of the critical range where aggressive management should be initiated to prevent perforation. - The critical range is generally considered **9-12 cm**.

Q: Which of the following is NOT a contraindication for colostomy planning?

Age > 60 yrs. ***Age > 60 yrs*** - While older patients may have more comorbidities, advanced age alone is generally **not an absolute contraindication** for colostomy planning or ostomy surgery. - The decision is based on the patient's overall health and ability to manage the stoma, not solely their age. *Stoma near skin creases and bony prominences* - Placing a stoma in these areas can **impair the seal of the ostomy appliance**, leading to leaks, skin irritation, and discomfort. - Such locations are therefore considered **contraindicated** to ensure proper stoma function and patient comfort. *Poorly motivated patient for elective stoma* - A patient's motivation and ability to learn stoma care are crucial for managing an ostomy successfully. - Poor motivation can lead to **neglect of stoma care**, resulting in complications like skin breakdown, infection, and social isolation. *Stomas through previous scars* - Positioning a stoma through a previous surgical scar increases the risk of **compromised healing**, **hernia formation**, and **stomal stenosis**. - Scar tissue may also make appliance adherence difficult, leading to leaks and skin issues.

Q: Treatment of choice for low fistula in ano?

Fistulotomy. ***Fistulotomy*** - **Fistulotomy** is the treatment of choice for **low fistula-in-ano** because it offers the highest success rate (>90%) with minimal risk of incontinence. - This procedure involves laying open the fistula tract, allowing it to heal from the inside out. - Low fistulas involve <30% of the external sphincter, making fistulotomy safe and effective. *Seton placement* - **Seton placement** is a technique where a thread or drain is placed through the fistula tract. - It is typically reserved for **high or complex fistulas** that involve a significant portion of the sphincter, where immediate fistulotomy would risk incontinence. - For simple low fistulas, seton placement is unnecessary and delays definitive treatment. *Intravenous antibiotics* - **Antibiotics** are primarily used to treat **acute infections** or abscesses associated with fistulas, but they do not resolve the fistula tract itself. - A fistula-in-ano is a chronic condition that requires **surgical intervention** for definitive cure. *Staged surgical resection* - **Staged procedures** or complex repairs (e.g., advancement flaps, LIFT procedure) are typically reserved for **high fistulas** or recurrent cases involving significant sphincter muscle. - For low fistulas, the simpler **fistulotomy** is usually sufficient and safer.

Question 1

What is the most appropriate management for a patient with confirmed diverticulitis and an abscess larger than 4 cm?

Accepted Answer

Percutaneous drainage

Answer

Antibiotic therapy alone

Answer

Immediate colectomy

Answer

Observation and diet modification

Question 2

A patient presents with acute onset of left-sided lower abdominal pain and a palpable mass. A CT scan shows thickening of the sigmoid colon with surrounding inflammation. What is the most likely diagnosis?

Accepted Answer

Diverticulitis

Answer

Colon cancer

Answer

Ischemic colitis

Answer

Crohn's disease

Question 3

A 50-year-old male presents with Stage III rectal cancer. He has undergone neoadjuvant chemoradiation. What are the critical intraoperative decisions that need to be made during the low anterior resection (LAR) procedure?

Accepted Answer

Achieving negative margins, deciding on the necessity of a diverting ileostomy, and assessing sphincter preservation

Answer

Determining the patient's dietary preferences

Answer

Length of the hospital stay

Answer

Availability of the operating room

Question 4

In a patient with toxic megacolon unresponsive to medical management, what key factors should be considered when deciding between subtotal colectomy and proctocolectomy with ileostomy?

Accepted Answer

Extent of colonic disease, patient’s nutritional status, and risk of future malignancy

Answer

Patient’s age and preference

Answer

Availability of surgical instruments

Answer

Immediate surgical intervention without further evaluation

Question 5

A 60-year-old man presents with progressive fatigue. Laboratory results reveal microcytic anemia, and a colonoscopy shows a mass. Which type of colon cancer is most commonly associated with this presentation?

Accepted Answer

Ascending colon carcinoma

Answer

Sigmoid colon carcinoma

Answer

Rectal carcinoma

Answer

Descending colon carcinoma

Question 6

What is the first-line treatment for a patient diagnosed with acute diverticulitis without complications?

Accepted Answer

Antibiotics

Answer

Immediate surgery

Answer

Probiotics

Answer

Dietary modification

Question 7

A 70-year-old male presents with abdominal pain and weight loss. A barium enema shows an 'apple core' lesion. What is the most likely diagnosis?

Accepted Answer

Colon cancer

Answer

Diverticulosis

Answer

Crohn's disease

Answer

Ulcerative colitis

Question 8

What is the critical diameter of the caecum when perforation is considered imminent in pseudo-obstruction?

Accepted Answer

9 cm

Answer

7 cm

Answer

8 cm

Answer

10 cm

Question 9

Which of the following is NOT a contraindication for colostomy planning?

Accepted Answer

Age > 60 yrs

Answer

Stoma near skin creases and bony prominences

Answer

Stomas through previous scars

Answer

Poorly motivated patient for elective stoma

Question 10

Treatment of choice for low fistula in ano?

Accepted Answer

Fistulotomy

Answer

Seton placement

Answer

Intravenous antibiotics

Answer

Staged surgical resection

Colorectal Surgery — MCQs

Colorectal Surgery — MCQs

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