Colorectal Surgery Practice Questions

Q: Which of the following is NOT used as a sclerosing agent for hemorrhoids?

Quinine urea. ***Quinine urea*** - **Quinine urea** was historically used as a sclerosing agent but is **no longer used** in modern practice due to significant adverse effects, including **tissue necrosis**, **gangrene**, and **anaphylaxis**. - Its use has been abandoned and replaced by safer alternatives, making it the agent that is NOT used for hemorrhoids today. *Phenol in olive oil* - **Phenol in olive oil** (typically 5%) is one of the most commonly used sclerosing agents for hemorrhoids, especially for **Grade I and early Grade II hemorrhoids**. - It induces an **inflammatory reaction** and subsequent fibrosis, fixing the hemorrhoidal tissue to the underlying musculature. *Sodium morrhuate* - **Sodium morrhuate** is a fatty acid salt derived from cod liver oil and is actively used as a sclerosing agent for hemorrhoids. - It generates a **local inflammatory response**, leading to venous thrombosis and fibrosis of hemorrhoidal tissue. *Polidocanol* - **Polidocanol** (Aethoxysklerol) is a modern sclerosing agent commonly used for hemorrhoid treatment. - It is effective, has a good safety profile, and works by damaging the vascular endothelium, causing thrombosis and fibrosis.

Q: What is the most common presentation of rectal polyps?

Bleeding. ***Bleeding*** - As polyps are vascularized structures, trauma from passing stool can cause them to **bleed**, leading to **hematochezia** (bright red blood in stool). - This symptom, often **painless**, is the most frequent clinical presentation that prompts patients to seek medical attention. *Abdominal pain* - While large or obstructive polyps can cause abdominal pain, it is **not the most common presentation** for typical rectal polyps. - Abdominal pain is more commonly associated with other gastrointestinal conditions like **inflammatory bowel disease** or **diverticulitis**. *Mucus discharge* - Some polyps, particularly **villous adenomas**, can secrete mucus, but this is **less common than bleeding** as a presenting symptom. - Mucus discharge is often an incidental finding rather than the chief complaint that brings patients to medical attention. *Bowel obstruction due to large polyps* - Bowel obstruction is a **rare complication** that occurs only with very large, usually malignant, or multiple polyps, and is **not a common initial presentation**. - Most polyps are small and do not significantly impede stool passage.

Q: Local excision in rectal cancer is done in all, except:

T2 cancer or any lymph node involvement. ***T2 cancer or any lymph node involvement*** - Local excision is typically reserved for **early-stage rectal cancers (T1 tumors)** where the risk of lymph node metastasis is very low and there is **no lymph node involvement**. - **T2 tumors** (invasion into muscularis propria) carry a significantly higher risk of lymph node metastasis (10-20%) and are generally **not suitable for local excision**, requiring radical resection instead. - **Any lymph node involvement** (even in T1 disease) is an **absolute contraindication** to local excision, as it indicates metastatic spread requiring comprehensive lymphadenectomy through radical resection. *Within 6 cm of anal verge* - This refers to the **location within the rectum** and accessibility for transanal approaches. - Rectal tumors within 6-8 cm of the anal verge are **suitable for local excision** techniques like transanal endoscopic microsurgery (TEM) or transanal minimally invasive surgery (TAMIS) if they meet other criteria (T1, N0, favorable histology). *Lesion <4 cm* - **Tumor size <3-4 cm** is one of the favorable criteria for local excision. - Smaller tumors are more amenable to complete excision with adequate margins and are associated with lower risk of lymph node metastasis. *Involvement of <40% circumference* - The **circumferential involvement** of the rectal wall is an important factor for technical feasibility. - Tumors involving **<30-40% of the circumference** are suitable for local excision, allowing adequate margin resection and primary closure without compromising rectal function or causing stenosis.

Q: Parastomal hernia is most frequently seen with:

End colostomy. ***End colostomy*** - **End colostomies** are associated with the highest rates of parastomal hernias due to the larger fascial defect and often larger bowel segments brought through the abdominal wall, creating a wider potential space for herniation. - The permanent nature of an end colostomy means a longer duration of exposure to factors contributing to hernia formation, such as increased abdominal pressure and fascial weakening. *Loop colostomy* - While loop colostomies can develop parastomal hernias, their incidence is generally lower than with end colostomies due to the typically smaller fascial defect created for a loop. - **Loop colostomies** are often temporary, reducing the long-term exposure to risk factors for hernia development compared to permanent stomas. *End ileostomy* - **End ileostomies** have a lower incidence of parastomal hernias compared to colostomies because the small bowel mesentery is less bulky, and the fascial opening required is typically smaller. - The contents of an ileostomy are less solid and generally exert less pressure on the fascial opening than colostomy contents. *Loop ileostomy* - **Loop ileostomies**, similar to loop colostomies, are often temporary and involve a relatively small fascial defect, contributing to a lower risk of parastomal hernia compared to permanent stomas. - The infrequency of parastomal hernias in loop ileostomies is also attributed to the typically smaller bowel segment brought through the abdominal wall and its temporary nature.

Q: Most important disadvantage of cryosurgery for hemorrhoids is:

Profuse watery discharge. ***Profuse watery discharge*** - **Profuse, foul-smelling watery discharge** is the **most important and troublesome disadvantage** of cryosurgery for hemorrhoids. - Results from **tissue necrosis and sloughing** following freezing, lasting **2-3 weeks** post-procedure. - This persistent discharge is **socially distressing**, requires frequent dressing changes, and is the primary reason cryosurgery has **largely fallen out of favor** in modern practice. - The severity and duration of this complication makes it more problematic than other side effects. *Pain* - While postoperative discomfort does occur, pain after cryosurgery is **generally not more severe** than with other hemorrhoid procedures. - The freezing effect can actually cause **temporary nerve damage** that may reduce immediate pain sensation. - Pain is manageable with standard analgesics and is **not the defining disadvantage** of this technique. *Infection* - Infection is **uncommon** with cryosurgery as the ultra-cold temperatures have some **antibacterial effect**. - Not a characteristic or major complication of this specific technique. *Hemorrhage* - Cryosurgery actually has a **lower risk of immediate bleeding** compared to excisional hemorrhoidectomy. - The freezing causes **vasoconstriction and thrombosis** of small vessels, reducing acute blood loss. - Delayed bleeding can rarely occur when eschar separates, but this is not the most significant disadvantage.

Q: A 28-year-old previously healthy woman arrives in the emergency room complaining of 24 hours of anorexia and nausea, and lower abdominal pain that is more intense in the right lower quadrant than elsewhere. On examination, she has peritoneal signs in the right lower quadrant and a rectal temperature of 38.38°C (101.8°F). At exploration through an incision in the right lower quadrant, she is found to have a small, contained perforation of a cecal diverticulum. Which of the following statements regarding cecal diverticula is true?

Diverticulectomy, closure of the cecal defect, and appendectomy may be indicated.. **Diverticulectomy, closure of the cecal defect, and appendectomy may be indicated.** - In cases of **perforated cecal diverticulitis**, surgical management often involves **diverticulectomy** to remove the inflamed diverticulum. - **Closure of the cecal defect** is necessary to prevent further leakage, and **appendectomy** is frequently performed concurrently to eliminate potential future diagnostic confusion given the similar presentation with appendicitis. - This is the **correct management** for the clinical scenario of a contained perforation. *Cecal diverticula are often solitary but rarely require surgical intervention.* - While cecal diverticula are often **solitary**, they frequently require surgical intervention when symptomatic or perforated as seen in this clinical scenario. - Symptomatic cecal diverticula, particularly those with **inflammation or perforation**, demand surgical management due to risks of complications like peritonitis. *Cecal diverticula are typically acquired pseudodiverticula like sigmoid diverticula.* - This is **incorrect**. Cecal diverticula are typically **congenital true diverticula** involving all layers of the bowel wall (mucosa, submucosa, and muscularis propria). - In contrast, sigmoid/colonic diverticula are **acquired pseudodiverticula** that contain only mucosa and submucosa herniating through the muscle layer. *Cecal diverticula are pseudodiverticula that commonly present with perforation.* - This is **incorrect**. Cecal diverticula are **true diverticula**, not pseudodiverticula, containing all layers of the intestinal wall. - While perforation can occur (as in this case), it is not a **common** presentation; most remain asymptomatic or present with inflammation mimicking appendicitis.

Q: A young male patient presents with complete rectal prolapse and no history of previous surgeries. The surgery of choice is:

Abdominal rectopexy. ***Abdominal rectopexy*** - **Abdominal rectopexy** is considered the surgery of choice for **complete rectal prolapse** in young, fit patients due to its superior long-term results in terms of recurrence rates. - This procedure involves addressing the prolapse via an abdominal approach, often by fixing the rectum to the sacrum, and may include sigmoid resection if there is a redundant colon. *Delorme's procedure* - This is a **perineal approach** that involves plication of the prolapsed rectal mucosa and muscle. - It is generally favored in **elderly** or **frail patients** due to its lower morbidity, but it has a higher recurrence rate compared to abdominal approaches. *Anterior resection* - **Anterior resection** is primarily a procedure for removing a diseased segment of the **left colon or rectum**, typically for cancer or diverticular disease. - While it may be combined with rectopexy if a redundant sigmoid colon is present, it is not the primary or sole treatment for rectal prolapse itself. *Goodsall's procedure* - **Goodsall's rule** is a principle used to predict the internal opening of an anal fistula based on the external opening's location, and **Goodsall's procedure** is not a named surgical technique for rectal prolapse. - This option appears to be a distractor, as there is no specific surgical procedure for rectal prolapse named after Goodsall.

Q: All of the following are true regarding pilonidal sinus except:

Seen predominantly in women. ***Seen predominantly in women*** - Pilonidal sinus is **more prevalent in men** than in women, with a male-to-female ratio of about 3–4:1. - This higher incidence in males is often attributed to greater hairiness and occupational factors. *Most commonly occurs in sacrococcygeal region* - This is a **TRUE statement** - the sacrococcygeal region is the **most common site** for pilonidal sinus (>90% of cases). - While less commonly, pilonidal sinuses can also occur in other hairy areas such as the periumbilical region, axilla, and scalp (particularly in barbers). *Tendency for recurrence* - Pilonidal sinuses have a **high tendency for recurrence**, even after surgical intervention, especially with inadequate excision or conservative management. - Factors contributing to recurrence include presence of **remaining hair follicles** or insufficient removal of sinus tracts. *Obesity is a risk factor* - **Obesity** is a recognized risk factor for the development of pilonidal sinus. - Increased weight can lead to deeper gluteal clefts, increased sweating, and friction, which promote hair follicle damage and foreign body inflammatory reactions.

Q: Most common site of chronic fissure in the anus is

Posterior. ***Posterior*** - The **posterior midline** is the most common site for anal fissures due to it being less well-supported and poorly vascularized, making it susceptible to trauma during defecation. - The internal anal sphincter pulls the anoderm in the posterior midline, making it the most common site of injury and fissure formation in both sexes. *Anterior* - While anterior fissures can occur, they are much less common than posterior fissures, accounting for a smaller percentage of all chronic fissures. - Anterior fissures are more common in women due to the different angles of the anterior anal canal in relation to the vaginal introitus, but still less frequent than posterior ones. *Anterolateral* - Fissures rarely occur in an anterolateral position. Anal fissures typically appear in the midline anteriorly or posteriorly. - This location is not anatomically predisposed to the same degree of trauma or stress experienced by the anterior or posterior midline during defecation. *Lateral* - **Lateral fissures** are uncommon and should raise suspicion for other underlying conditions, such as **inflammatory bowel disease** (Crohn's disease), tuberculosis, or malignancy [1]. - The anal canal's support and vascularization are generally better in the lateral aspects, making primary fissure formation here less likely.

Question 1

Which of the following is NOT used as a sclerosing agent for hemorrhoids?

Accepted Answer

Quinine urea

Answer

Polidocanol

Answer

Phenol in olive oil

Answer

Sodium morrhuate

Question 2

What is the most common presentation of rectal polyps?

Accepted Answer

Bleeding

Answer

Abdominal pain

Answer

Mucus discharge

Answer

Bowel obstruction due to large polyps

Question 3

Local excision in rectal cancer is done in all, except:

Accepted Answer

T2 cancer or any lymph node involvement

Answer

Involvement of <40% circumference

Answer

Lesion <4 cm

Answer

Within 6 cm of anal verge

Question 4

Parastomal hernia is most frequently seen with:

Accepted Answer

End colostomy

Answer

Loop colostomy

Answer

End ileostomy

Answer

Loop ileostomy

Question 5

Most important disadvantage of cryosurgery for hemorrhoids is:

Accepted Answer

Profuse watery discharge

Answer

Pain

Answer

Infection

Answer

Hemorrhage

Question 6

A 28-year-old previously healthy woman arrives in the emergency room complaining of 24 hours of anorexia and nausea, and lower abdominal pain that is more intense in the right lower quadrant than elsewhere. On examination, she has peritoneal signs in the right lower quadrant and a rectal temperature of 38.38°C (101.8°F). At exploration through an incision in the right lower quadrant, she is found to have a small, contained perforation of a cecal diverticulum. Which of the following statements regarding cecal diverticula is true?

Accepted Answer

Diverticulectomy, closure of the cecal defect, and appendectomy may be indicated.

Answer

Cecal diverticula are often solitary but rarely require surgical intervention.

Answer

Cecal diverticula are typically acquired pseudodiverticula like sigmoid diverticula.

Answer

Cecal diverticula are pseudodiverticula that commonly present with perforation.

Question 7

A patient with a non-obstructing carcinoma of the sigmoid colon is being prepared for elective resection. To minimize the risk of postoperative infectious complications, what should be included in your planning?

Accepted Answer

A single preoperative parenteral dose of antibiotic effective against aerobes and anaerobes may provide initial coverage.

Answer

Postoperative administration for 5 to 7 days of parenteral antibiotics effective against aerobes and anaerobes

Answer

Postoperative administration for 2 to 4 days of parenteral antibiotics effective against aerobes and anaerobes

Answer

Avoidance of oral antibiotics to prevent emergence of Clostridioides difficile

Question 8

A young male patient presents with complete rectal prolapse and no history of previous surgeries. The surgery of choice is:

Accepted Answer

Abdominal rectopexy

Answer

Delorme's procedure

Answer

Anterior resection

Answer

Goodsall's procedure

Question 9

All of the following are true regarding pilonidal sinus except:

Accepted Answer

Seen predominantly in women

Answer

Most commonly occurs in sacrococcygeal region

Answer

Obesity is a risk factor

Answer

tendency for recurrence

Question 10

Most common site of chronic fissure in the anus is

Accepted Answer

Posterior

Answer

Answer

Anterolateral

Answer

Lateral

Colorectal Surgery — MCQs

Colorectal Surgery — MCQs

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