Small Intestine Pathology — MCQs
A pregnant female had meconium-stained liquor and underwent emergency LSCS. A few days later, her condition deteriorated, and an ultrasound showed edematous bowels. What is the most likely cause of her condition?
Which of the following is true about carcinoid tumor?
Which of the following is a feature of ulcerative colitis?
Which of the following is a true statement about Meckel's diverticulum?
A 10 month old infant presents with acute intestinal obstruction. Contrast enema X-ray shows the intussusception, likely cause is -
A patient presents with abdominal pain, blood in stools and a palpable mass on examination. A Barium Study was performed, probable diagnosis is?
Which of the following is the MOST reliable intraoperative feature of viable small bowel? 1. Visible peristalsis 2. Flabby intestinal musculature 3. Shiny appearance of small bowel wall 4. Visible pulsation in the mesenteric artery
Tumour of the uncinate process of the pancreas will compress which artery
Identify the artery labeled as 'X' in the provided angiography anatomy image.
Glucose is primarily absorbed from which part of the small intestine?
Small Intestine Pathology Indian Medical PG Practice Questions and MCQs
Question 1: A pregnant female had meconium-stained liquor and underwent emergency LSCS. A few days later, her condition deteriorated, and an ultrasound showed edematous bowels. What is the most likely cause of her condition?
- A. Adhesive intestinal obstruction
- B. Intra-abdominal abscess
- C. Paralytic ileus (Correct Answer)
- D. Intestinal perforation
Explanation: ***Paralytic ileus*** - **Paralytic ileus**, often called **postoperative ileus**, is a common complication after abdominal surgeries like **LSCS**, especially when associated with complications like meconium-stained liquor. - The combination of **meconium-stained liquor** (indicating fetal distress/inflammation) and **emergency LSCS** increases the risk for a prolonged inflammatory response post-surgery, leading to intestinal paralysis and **edematous bowels**. - Ultrasound findings of **edematous bowels** without signs of mechanical obstruction support this diagnosis. *Adhesive intestinal obstruction* - **Adhesive intestinal obstruction** usually occurs later, weeks to years after surgery, as **adhesions** form and contract. - While possible, it is less likely to present acutely a "few days later" after an initial surgery compared to **paralytic ileus**. *Intra-abdominal abscess* - An **intra-abdominal abscess** would typically cause localized pain, fever, and signs of infection with more focal findings on imaging. - The primary observation of **edematous bowels** points more directly to diffuse bowel dysfunction rather than a localized collection. *Intestinal perforation* - **Intestinal perforation** would present with acute peritonitis, free fluid/air on imaging, severe abdominal pain, and signs of sepsis. - While edematous bowels can be present, the clinical picture would be more dramatic with peritoneal signs rather than the subacute deterioration described here.
Question 2: Which of the following is true about carcinoid tumor?
- A. Presentation is hypotension and diaphoresis
- B. Intestinal carcinoids are of high malignant potential
- C. Best diagnosed by elevated urinary vanillymandelic acid levels
- D. Can occur throughout the gastrointestinal tract (Correct Answer)
Explanation: ***Can occur throughout the gastrointestinal tract*** - Carcinoid tumors (neuroendocrine tumors) are most commonly found in the **gastrointestinal tract**, particularly in the small intestine, appendix, rectum, and stomach [2]. - They arise from **enterochromaffin cells** and can secrete various vasoactive substances. *Presentation is hypotension and diaphoresis* - The classic presentation of **carcinoid syndrome** includes episodes of **flushing**, **diarrhea**, and **bronchospasm**, often accompanied by **hypertension** rather than hypotension due to the release of serotonin and other vasoactive peptides [1]. - While diaphoresis can occur, **hypotension** is not a primary or characteristic feature. *Intestinal carcinoids are of high malignant potential* - The malignant potential of carcinoid tumors varies depending on their primary site and size but is generally considered to be of **low-to-moderate malignant potential**, particularly for appendiceal and rectal carcinoids [2]. - Liver metastases significantly increase morbidity and mortality, but many small intestinal carcinoids may grow slowly or remain localized for extended periods [1]. *Best diagnosed by elevated urinary vanillymandelic acid levels* - Elevated **urinary vanillymandellic acid (VMA)** levels are primarily used to diagnose **pheochromocytoma**, a tumor of the adrenal medulla that secretes catecholamines. - Carcinoid tumors are best diagnosed by measuring **urinary 5-hydroxyindoleacetic acid (5-HIAA)**, a breakdown product of serotonin.
Question 3: Which of the following is a feature of ulcerative colitis?
- A. Spiking fever
- B. Proctitis (Correct Answer)
- C. Fistula formation
- D. Cobble stone mucosa
Explanation: ***Proctitis*** - **Proctitis**, or inflammation of the rectum, is a hallmark feature of ulcerative colitis as the disease always begins in the rectum and can extend proximally [1]. - Patients typically experience **tenesmus**, urgency, and bloody diarrhea due to rectal involvement. *Spiking fever* - While patients with severe ulcerative colitis can experience fever, a **spiking fever** is less common than in other inflammatory conditions or infections. - Fever is a more common and prominent symptom in **Crohn's disease**, particularly with perianal complications or abscesses. *Fistula formation* - **Fistulas** (abnormal connections between organs or to the skin) are a characteristic complication of **Crohn's disease**, not ulcerative colitis. - Ulcerative colitis affects only the **mucosa** and submucosa, making transmural inflammation and fistula formation rare [1]. *Cobble stone mucosa* - **Cobblestone mucosa**, characterized by linear ulcers interspersed with edematous, normal-appearing mucosa, is a classic endoscopic finding in **Crohn's disease**. - In contrast, ulcerative colitis presents with **diffuse, continuous inflammation** and ulceration without skip lesions or cobblestoning [1].
Question 4: Which of the following is a true statement about Meckel's diverticulum?
- A. It is found on the mesenteric side of the ileum
- B. It is located on the antimesenteric side of the ileum. (Correct Answer)
- C. Meckel's diverticulum is always associated with Littre's hernia
- D. It is a false diverticulum formed by mucosal herniation
Explanation: ***It is located on the antimesenteric side of the ileum.*** - Meckel's diverticulum is a **true diverticulum** located on the **antimesenteric border** of the ileum, typically within 100 cm of the ileocecal valve. - This anatomical position is characteristic and helps differentiate it from other intestinal anomalies. - It contains all layers of the bowel wall, distinguishing it from false diverticula. *It is a false diverticulum formed by mucosal herniation* - This statement is **incorrect** because Meckel's diverticulum is a **true diverticulum**, not a false one. - A true diverticulum contains **all three layers** of the bowel wall (mucosa, submucosa, and muscularis propria), unlike false diverticula which only involve mucosa and submucosa herniating through the muscular layer. - Meckel's diverticulum is a remnant of the **omphalomesenteric duct** (vitellointestinal duct) and often contains heterotopic gastric or pancreatic tissue. *It is found on the mesenteric side of the ileum* - This statement is incorrect as Meckel's diverticulum is characteristically found on the **antimesenteric side** of the ileum. - Its antimesenteric location is a key distinguishing feature and helps in surgical identification. *Meckel's diverticulum is always associated with Littre's hernia* - While it is possible for a Meckel's diverticulum to be present within a **hernia sac** (Littre's hernia), this association is **not always** present. - Littre's hernia is a specific type of hernia where a Meckel's diverticulum is contained within the hernia sac, but most Meckel's diverticula do not present as part of a hernia.
Question 5: A 10 month old infant presents with acute intestinal obstruction. Contrast enema X-ray shows the intussusception, likely cause is -
- A. Mucosal polyp
- B. Duplication cyst
- C. Meckel's diverticulum
- D. Peyer's patch hypertrophy (Correct Answer)
Explanation: ***Peyer's patch hypertrophy*** - In infants, **idiopathic intussusception** is most often linked to **lymphoid hyperplasia** (Peyer's patch hypertrophy) in the terminal ileum, often triggered by viral infections. - Enlarged Peyer's patches act as a **leading point** for the intussusception into the colon. *Mucosal polyp* - While polyps can act as a leading point for intussusception, they are a **less common cause** in this age group than lymphoid hyperplasia. - **Pediatric polyps** are typically **juvenile polyps**, usually asymptomatic or causing painless rectal bleeding, and rarely trigger intussusception in infants. *Duplication cyst* - **Duplication cysts** can serve as a leading point for intussusception, but they are relatively **rare** compared to Peyer's patch hypertrophy. - They are usually discovered due to their mass effect or complications like hemorrhage or obstruction, but are not the most common cause of intussusception in an otherwise healthy infant. *Meckel's diverticulum* - **Meckel's diverticulum** can indeed cause intussusception, especially in older children or adults, but it's **less likely** than lymphoid hyperplasia in a typically developing 10-month-old infant. - When Meckel's diverticulum causes intussusception, it often presents with other symptoms like **painless rectal bleeding** due to ectopic gastric mucosa.
Question 6: A patient presents with abdominal pain, blood in stools and a palpable mass on examination. A Barium Study was performed, probable diagnosis is?
- A. Volvulus
- B. Meckel's Diverticulum
- C. Diverticulitis
- D. Intussusception (Correct Answer)
Explanation: ***Intussusception*** - This condition is characterized by a "telescoping" of one segment of the intestine into another, which can lead to **abdominal pain**, **rectal bleeding** (often described as "currant jelly" stools), and a **palpable sausage-shaped mass** on examination. - A barium study (specifically a **barium enema**) is often diagnostic and can also be therapeutic for intussusception, revealing a **coiled spring appearance** or an obstruction. *Volvulus* - Volvulus involves the **twisting of a loop of bowel** around its mesentery, often presenting with sudden onset, severe **abdominal pain**, vomiting, and constipation. - While it can cause an obstruction and pain, a palpable mass and bloody stools are less common initial findings compared to intussusception. *Meckel's Diverticulum* - Meckel's diverticulum is a **congenital outpouching** of the small intestine that can be asymptomatic or cause complications like **gastrointestinal bleeding** (due to ectopic gastric mucosa), obstruction, or diverticulitis. - While it can cause painless rectal bleeding, a palpable mass and acute, intermittent abdominal pain are not typical primary presentations for an uncomplicated Meckel’s diverticulum. *Diverticulitis* - Diverticulitis is the **inflammation of diverticula** (small pouches in the colon), typically presenting with **left lower quadrant abdominal pain**, fever, and changes in bowel habits. - While it can cause bleeding, a palpable mass is less common unless there's an abscess, and the clinical picture does not align as strongly with the "currant jelly stool" and classic palpable mass of intussusception.
Question 7: Which of the following is the MOST reliable intraoperative feature of viable small bowel? 1. Visible peristalsis 2. Flabby intestinal musculature 3. Shiny appearance of small bowel wall 4. Visible pulsation in the mesenteric artery
- A. 3. Shiny appearance of small bowel wall
- B. 2. Flabby intestinal musculature
- C. 4. Visible pulsation in the mesenteric artery
- D. 1. Visible peristalsis (Correct Answer)
Explanation: ***Visible peristalsis*** - The presence of **visible peristalsis** is the **MOST reliable indicator** of viable small bowel, demonstrating preserved neuromuscular function and tissue vitality. - Among the classical "3 Ps" of bowel viability (Peristalsis, Pulsation, Pink color), **peristalsis is the most direct indicator** as it confirms functional integrity of the bowel wall itself. - This indicates that the muscle layers of the intestine (longitudinal and circular) are functioning properly with intact innervation. *Shiny appearance of small bowel wall* - A **shiny serosa** is indeed a feature of viable bowel, indicating healthy, well-perfused tissue with an intact mesenteric surface. - However, it is a **less specific indicator** compared to peristalsis, as the appearance can be subjective and may not directly correlate with functional viability. *Visible pulsation in the mesenteric artery* - **Visible pulsation** in the mesenteric artery is one of the classical signs of viability and indicates blood flow to the vessel. - However, arterial pulsation alone **does not guarantee adequate tissue perfusion** or venous drainage, and ischemia can still occur despite pulsatile flow (e.g., venous thrombosis). - Peristalsis is more reliable as it confirms both adequate perfusion AND functional integrity. *Flabby intestinal musculature* - **Flabby intestinal musculature** indicates **non-viable bowel** with loss of tone, suggesting ischemia or necrosis. - Viable bowel typically feels **turgid and elastic** with good tone, not flabby.
Question 8: Tumour of the uncinate process of the pancreas will compress which artery
- A. Superior mesenteric artery (Correct Answer)
- B. Inferior mesenteric artery
- C. Common hepatic artery
- D. Splenic artery
Explanation: ***Superior mesenteric artery*** - The **uncinate process** forms the lower and medial part of the head of the pancreas, hooking around and behind the **superior mesenteric vessels**. - A tumor in this region would therefore almost immediately compress the **superior mesenteric artery** and vein due to its close anatomical relationship. *Splenic artery* - The **splenic artery** runs along the superior border of the pancreas, primarily associated with the body and tail. - A tumor in the **uncinate process** (part of the head) would be anatomically distant from the splenic artery, making compression unlikely. *Inferior mesenteric artery* - The **inferior mesenteric artery** arises from the aorta much lower than the pancreas, typically at the L3 vertebral level. - Its anatomical position makes it spatially separated from the uncinate process of the pancreas, so compression is not expected. *Common hepatic artery* - The **common hepatic artery** runs anterior to the portal vein and to the left of the bile duct, supplying the liver. - It is located superior to the head of the pancreas and away from the uncinate process, hence not typically affected by tumors in that specific pancreatic region.
Question 9: Identify the artery labeled as 'X' in the provided angiography anatomy image.
- A. Superior mesenteric artery (Correct Answer)
- B. Subclavian artery
- C. Celiac trunk
- D. Brachiocephalic trunk
Explanation: ***Superior mesenteric artery*** - The image displays a selective angiogram highlighting an artery branching off the **aorta** in the abdominal region and supplying multiple loops of bowel, characteristic of the superior mesenteric artery. - The location and extensive branching pattern supplying various abdominal structures confirm its identity as the **superior mesenteric artery**, which typically arises below the celiac trunk. *Subclavian artery* - The **subclavian artery** is located in the chest and shoulder region, supplying the upper limbs and parts of the head and neck. - Its anatomical location and distribution are distinctly different from the abdominal artery shown in the image. *Celiac trunk* - The **celiac trunk** is an earlier branch off the aorta, typically arising just below the diaphragm, and it branches into the splenic, left gastric, and common hepatic arteries. - The artery labeled 'X' arises lower than where the celiac trunk would typically originate and demonstrates a different branching pattern. *Brachiocephalic trunk* - The **brachiocephalic trunk** (also known as the innominate artery) is a major artery in the upper chest, typically the first branch off the aortic arch. - It supplies blood to the right arm and head, not abdominal organs, making it anatomically incorrect for the artery labeled 'X'.
Question 10: Glucose is primarily absorbed from which part of the small intestine?
- A. Proximal part of the small intestine (Correct Answer)
- B. Distal part of the small intestine
- C. Cecum
- D. Colon
Explanation: ***Proximal part of the small intestine*** - The majority of nutrient absorption, including **glucose**, occurs in the **duodenum** and **jejunum**, which constitute the proximal small intestine. - Glucose absorption mechanisms, such as **SGLT1** and **GLUT2** transporters, are highly concentrated and active in this region. - This is where the surface area is maximized with villi and microvilli for optimal absorption. *Distal part of the small intestine* - The **ileum**, which is the distal part, is primarily responsible for absorbing **vitamin B12** and **bile salts**, not the bulk of glucose. - While some minimal glucose absorption might occur, it is not the primary site. *Cecum* - The cecum is the beginning of the **large intestine** and is involved in **water** and **electrolyte** absorption and microbial fermentation. - It is not involved in significant nutrient absorption like glucose. *Colon* - The colon is part of the **large intestine** and primarily absorbs **water** and **electrolytes**. - By the time contents reach the colon, virtually all glucose has already been absorbed in the small intestine.
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