Malabsorption Syndromes — MCQs
A 35-year-old Caucasian female presents with anemia, malaise, bloating, and diarrhea. Past genetic testing revealed that this patient carries the HLA-DQ2 allele. The physician suspects that the patient's presentation is dietary in cause. Which of the following findings would definitively confirm this diagnosis?
Treatment of dermatitis herpetiformis:
Which of the following is not true regarding Whipple's Disease ?
A 4-year-old boy is admitted to the hospital with pneumonia and respiratory distress. The nurses report that the child's bowel movements are greasy and have a pungent odor. A sweat-chloride test is positive. Which of the following mechanisms of disease is the most likely cause of steatorrhea in this child?
Which of the following vitamin deficiencies is seen in short bowel syndrome?
Macrophages containing large quantities of undigested and partially digested bacteria in the intestine, specifically PAS-positive macrophages, are seen in which of the following conditions?
D-xylose absorption test is used to assess which of the following conditions?
Vitamin D absorption is decreased by ?
All of the following are features of Zollinger Ellison syndrome except:
What is a feature of short bowel syndrome?
Malabsorption Syndromes Indian Medical PG Practice Questions and MCQs
Question 1: A 35-year-old Caucasian female presents with anemia, malaise, bloating, and diarrhea. Past genetic testing revealed that this patient carries the HLA-DQ2 allele. The physician suspects that the patient's presentation is dietary in cause. Which of the following findings would definitively confirm this diagnosis?
- A. CT scan showing inflammation of the small bowel wall
- B. Biopsy of the duodenum showing atrophy and blunting of villi (Correct Answer)
- C. Biopsy of the colon showing epithelial cell apoptosis
- D. Esophageal endoscopy showing lower esophageal metaplasia
- E. Liver biopsy showing apoptosis of hepatocytes
Explanation: ***Biopsy of the duodenum showing atrophy and blunting of villi*** - This finding is the **gold standard** for diagnosing **celiac disease**, which aligns with the patient's symptoms (anemia, malaise, bloating, diarrhea), genetic predisposition (HLA-DQ2 allele), and suspected dietary cause. - The characteristic **villous atrophy** and **crypt hyperplasia** seen in duodenal biopsies are hallmark pathological changes in celiac disease due to gluten exposure. *CT scan showing inflammation of the small bowel wall* - While a CT scan can show **inflammation**, it is not specific enough to definitively diagnose celiac disease, as many other conditions can cause small bowel inflammation. - It does not provide the **histopathological detail** necessary to confirm villous atrophy, which is key for celiac diagnosis. *Biopsy of the colon showing epithelial cell apoptosis* - **Epithelial cell apoptosis** in the colon is not a primary diagnostic feature of celiac disease, which primarily affects the **small intestine**. - This finding might be associated with other inflammatory bowel conditions or infections, not gluten-induced enteropathy. *Esophageal endoscopy showing lower esophageal metaplasia* - **Lower esophageal metaplasia**, or **Barrett's esophagus**, is a pre-cancerous condition of the esophagus, often caused by chronic acid reflux. - This finding is unrelated to celiac disease and does not explain the patient's gastrointestinal symptoms or genetic predisposition. *Liver biopsy showing apoptosis of hepatocytes* - **Apoptosis of hepatocytes** (liver cell death) would indicate liver damage or disease, such as hepatitis or drug-induced injury. - While celiac disease can sometimes have **hepatic manifestations**, liver apoptosis is not a primary or definitive diagnostic criterion for celiac disease itself.
Question 2: Treatment of dermatitis herpetiformis:
- A. Dapsone
- B. Sulfonamide
- C. Gluten-free diet
- D. All of the options (Correct Answer)
Explanation: ***All of the options*** - **Dermatitis herpetiformis (DH)** is a chronic, intensely itchy blistering skin condition associated with **celiac disease**. - Effective management involves both a **gluten-free diet** to address the underlying autoimmune process and medications like **dapsone** or **sulfonamides** for symptomatic relief. *Gluten-free diet* - A strict **gluten-free diet** is crucial for long-term management as it addresses the underlying small intestinal enteropathy associated with **celiac disease** and **dermatitis herpetiformis**. - While it may take several months to see full skin improvement, it can eventually lead to resolution of skin lesions and reduced or eliminated need for medication. *Dapsone* - **Dapsone** is a rapidly effective medication for alleviating the intense itching and rash of **dermatitis herpetiformis**, often providing relief within 24-48 hours. - It works by inhibiting neutrophil migration and inflammation, but does not treat the underlying gluten-sensitive enteropathy. *Sulfonamide* - **Sulfonamides**, such as sulfapyridine or sulfamethoxypyridazine, can be used as an alternative for patients who cannot tolerate **dapsone** or who respond inadequately to it. - Like dapsone, these medications provide symptomatic relief by reducing inflammation and neutrophil activity in the skin, but do not address the gluten-induced intestinal damage.
Question 3: Which of the following is not true regarding Whipple's Disease ?
- A. It has autoimmune etiology. (Correct Answer)
- B. Bacteria laden macrophages are present in lymphatic system.
- C. PAS positive diastase resistant granules are present.
- D. Foamy macrophages are characteristics.
Explanation: ***It has autoimmune etiology.*** - Whipple's disease is caused by the **bacterium *Tropheryma whipplei***, not by an autoimmune process [1]. - While there may be an underlying genetic predisposition affecting the immune response, the disease itself is a **bacterial infection** [1]. *Foamy macrophages are characteristics.* - **Foamy macrophages**, which are macrophages distended with ingested bacteria and cellular debris, are a **hallmark pathological finding** in Whipple's disease [1]. - These cells are abundant in affected tissues, particularly the small intestine lamina propria. *Bacteria laden macrophages are present in lymphatic system.* - The lymphatic system, including **lymph nodes**, is commonly involved in Whipple's disease, with **macrophages laden with *T. whipplei*** found within them [1]. - This lymphatic involvement contributes to the malabsorption and systemic symptoms of the disease [1]. *PAS positive diastase resistant granules are present.* - The bacterial remnants within the macrophages in Whipple's disease stain strongly with **Periodic Acid-Schiff (PAS) stain**. - These PAS-positive granules are **diastase-resistant**, which helps distinguish them from glycogen and other PAS-positive substances. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 798-799.
Question 4: A 4-year-old boy is admitted to the hospital with pneumonia and respiratory distress. The nurses report that the child's bowel movements are greasy and have a pungent odor. A sweat-chloride test is positive. Which of the following mechanisms of disease is the most likely cause of steatorrhea in this child?
- A. Abnormal dietary intake
- B. Lack of pancreatic enzyme secretion (Correct Answer)
- C. Hyperbilirubinemia with kernicterus
- D. Bacterial overgrowth
Explanation: ***Lack of pancreatic enzyme secretion*** - The clinical picture of **pneumonia**, **respiratory distress**, **greasy/pungent bowel movements (steatorrhea)**, and a **positive sweat chloride test** is classic for **cystic fibrosis (CF)**. - In CF, a defective **CFTR protein** leads to thick, viscous secretions that block pancreatic ducts, causing **pancreatic insufficiency** and leading to inadequate release of digestive enzymes necessary for fat absorption. *Abnormal dietary intake* - While dietary factors can contribute to digestive issues, abnormal intake alone would not explain the other core features like the **positive sweat chloride test** or recurrent respiratory infections characteristic of cystic fibrosis. - This mechanism doesn't account for the fundamental physiological defect seen in this patient. *Hyperbilirubinemia with kernicterus* - **Kernicterus** is a condition caused by very high levels of **bilirubin** in a newborn's blood, leading to brain damage; it is not typically associated with steatorrhea or the respiratory symptoms described. - While CF can sometimes cause liver complications, **kernicterus** is unrelated to the primary mechanism of steatorrhea in this context. *Bacterial overgrowth* - **Bacterial overgrowth** in the small intestine can cause malabsorption and diarrhea, but it does not directly lead to the specific findings of **respiratory distress**, recurrent infections, or the underlying genetic defect indicated by a **positive sweat chloride test** in cystic fibrosis. - This condition is not the primary cause of the systemic and pancreatic issues described.
Question 5: Which of the following vitamin deficiencies is seen in short bowel syndrome?
- A. Vitamin K
- B. Vitamin B 12 (Correct Answer)
- C. Vitamin A
- D. Vitamin D
Explanation: ### Vitamin B 12 - **Short bowel syndrome (SBS)** often leads to **malabsorption** of vitamin B12, particularly if the **terminal ileum**—the primary site of B12 absorption—is affected or resected [2]. - **Vitamin B12 deficiency** can result in **megaloblastic anemia** and neurological complications [1]. *Vitamin K* - While **fat-soluble vitamins** can be malabsorbed in SBS due to **fat malabsorption**, **vitamin K deficiency** is less common than B12 deficiency unless there is significant **cholestasis** or extensive small bowel resection affecting bile salt absorption [3]. - **Vitamin K** is also synthesized by **gut bacteria**, which might partially compensate for dietary malabsorption in some cases. *Vitamin A* - **Vitamin A** is a **fat-soluble vitamin** that can be malabsorbed in SBS, especially in patients with significant **fat malabsorption** [3]. - However, **vitamin B12 deficiency** is a more universal and severe concern in many SBS patients and directly relates to the specific absorption site in the **terminal ileum** [2]. *Vitamin D* - **Vitamin D** is also a **fat-soluble vitamin**, and its malabsorption is common in SBS due to **steatorrhea** and reduced absorption surface [3]. - While important, the question asks for "the" most likely deficiency, and **vitamin B12** is particularly vulnerable due to its specific intestinal absorption site being frequently affected in SBS [2].
Question 6: Macrophages containing large quantities of undigested and partially digested bacteria in the intestine, specifically PAS-positive macrophages, are seen in which of the following conditions?
- A. Whipple's disease (Correct Answer)
- B. Amyloidosis
- C. Immunoproliferative small intestinal disease
- D. Vibrio cholerae infection
Explanation: ***Whipple's disease*** - **Whipple's disease** is characterized by the accumulation of **PAS-positive macrophages** containing undigested **Tropheryma whipplei** bacteria in the lamina propria of the small intestine [1]. - These macrophages contain bacteria that appear as **foamy, distended cells** on histology [1]. - The PAS-positive staining is pathognomonic and distinguishes this condition from other causes of malabsorption. - Clinical features include **steatorrhea**, weight loss, arthralgia, and neurological symptoms [1]. *Amyloidosis* - **Amyloidosis** is characterized by the extracellular deposition of abnormal **fibrillar proteins (amyloid)** in various tissues, not by intracellular bacteria-laden macrophages. - Diagnosed by **Congo red staining** which shows apple-green birefringence under polarized light. - Can cause GI symptoms but histology shows acellular amyloid deposits, not macrophages. *Immunoproliferative small intestinal disease* - This condition involves the proliferation of **B lymphocytes** in the small intestine, producing **alpha heavy chains**. - Seen in regions with chronic parasitic infections and leads to malabsorption. - Histology shows lymphoplasmacytic infiltration, not PAS-positive macrophages with bacteria. *Vibrio cholerae infection* - **Vibrio cholerae** causes severe secretory diarrhea by producing **cholera toxin**, which activates adenylate cyclase in intestinal epithelial cells. - The bacteria colonize the intestinal lumen but do not invade tissues or lead to macrophage accumulation. - Histology shows preserved mucosal architecture without characteristic macrophage findings. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 798-799.
Question 7: D-xylose absorption test is used to assess which of the following conditions?
- A. Colon cancer
- B. PUD
- C. Celiac disease (Correct Answer)
- D. Ulcerative colitis
Explanation: Celiac disease - The **D-xylose absorption test** assesses the functional integrity of the **small intestinal mucosa**, which is damaged in celiac disease. [1] - In celiac disease, the damaged villi impair the absorption of D-xylose, leading to **low urinary excretion** of the sugar. *Colon cancer* - Colon cancer primarily affects the **large intestine** and does not typically interfere with small intestinal D-xylose absorption. [2] - Diagnosis commonly involves **colonoscopy** and biopsy, not absorption tests. *PUD* - **Peptic ulcer disease (PUD)** affects the stomach or duodenum and does not impair the absorptive function of the small intestine. [3] - The primary diagnostic tool for PUD is **endoscopy** with biopsy for H. pylori. *Ulcerative colitis* - **Ulcerative colitis** is an inflammatory condition predominantly affecting the **large intestine** and rectum. [2] - It does not cause malabsorption in the small intestine, and therefore, D-xylose absorption would typically be normal.
Question 8: Vitamin D absorption is decreased by ?
- A. Proteins
- B. Acid
- C. Lactose
- D. Fat malabsorption (Correct Answer)
Explanation: ***Fat malabsorption*** - **Vitamin D** is a **fat-soluble vitamin**, meaning it requires dietary fat for proper absorption in the small intestine. - Conditions causing **fat malabsorption**, such as **cystic fibrosis**, **celiac disease**, or **pancreatic insufficiency**, significantly reduce the uptake of vitamin D. *Proteins* - **Proteins** do not directly decrease vitamin D absorption; in fact, some dietary proteins can enhance vitamin D binding and transport in the bloodstream. - Their primary role is in structural and enzymatic functions, not impeding fat-soluble vitamin uptake. *Acid* - **Gastric acid** is important for the absorption of some nutrients, but it generally does not directly hinder the absorption of **fat-soluble vitamins** like vitamin D. - Conditions like **achlorhydria** primarily affect the absorption of minerals and vitamin B12, rather than vitamin D. *Lactose* - **Lactose** is a sugar found in milk, and its malabsorption (lactose intolerance) primarily causes gastrointestinal symptoms like bloating and diarrhea. - It does not directly interfere with the absorption of **fat-soluble vitamins**; rather, it affects carbohydrate digestion.
Question 9: All of the following are features of Zollinger Ellison syndrome except:
- A. Severe diarrhoea
- B. Beta cell tumours of the pancreas (Correct Answer)
- C. Very high acid output
- D. Intractable peptic ulcers
Explanation: ***Beta cell tumours of the pancreas*** - Zollinger-Ellison syndrome (ZES) is caused by **gastrinomas**, which are **neuroendocrine tumors** that typically arise from the **gastrin-producing G cells**, not the insulin-producing beta cells, of the pancreas or duodenum. - While pancreatic tumors are common in ZES, they are specifically **gastrinomas**, leading to excessive gastrin secretion. *Severe diarrhoea* - This is a common feature of ZES resulting from the **high acid output** reaching the small intestine. - The excessive acid inactivates pancreatic lipase, leading to **maldigestion** and stimulates fluid and electrolyte secretion, causing secretory diarrhea. *Very high acid output* - ZES is characterized by the **overproduction of gastrin**, which stimulates the parietal cells of the stomach to secrete large amounts of **hydrochloric acid**. - This leads to a significantly **increased basal and maximal acid output** in the stomach. *Intractable peptic ulcers* - The extremely high gastric acid secretion in ZES causes **multiple, recurrent, and often refractory peptic ulcers**, which can be located in atypical sites such as the jejunum. - These ulcers are typically difficult to treat with standard anti-ulcer medications due to the persistent gastric hypersecretion.
Question 10: What is a feature of short bowel syndrome?
- A. Hypergastrinemia & high gastric secretion is seen
- B. Diarrhea, dehydration and malnutrition
- C. Chronic TPN dependence
- D. Malabsorption leading to diarrhea, dehydration, and malnutrition. (Correct Answer)
Explanation: ***Malabsorption leading to diarrhea, dehydration, and malnutrition.*** [1], [2] - The primary characteristic of short bowel syndrome is **reduced intestinal surface area**, leading to inadequate absorption of nutrients, water, and electrolytes [1]. - This malabsorption manifests as **chronic diarrhea**, which can cause significant **dehydration** and **malnutrition** due to nutrient deficiencies [2]. *Diarrhea, dehydration and malnutrition* - While these are prominent symptoms, they are consequences of the underlying **malabsorption**, which is the fundamental process. - This option describes symptoms but doesn't fully explain the root physiological mechanism as comprehensively as the correct answer. *Chronic TPN dependence* - **Total Parenteral Nutrition (TPN)** dependence can be a severe consequence for patients with very short or severely damaged bowel segments, but it is not a feature inherent to all cases of short bowel syndrome. - Many patients can manage with oral or enteral nutrition, especially if a significant portion of the small bowel remains functional. *Hypergastrinemia & high gastric secretion is seen* - This can occur in certain cases of short bowel syndrome, particularly if there is a loss of the **duodenum** (which normally inhibits gastrin release) or if there's extensive ileal resection. - However, it's not a universal or defining feature for all patients and is secondary to the primary problem of malabsorption.
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