Gastroenterology — MCQs
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In cystic fibrosis of the pancreas, which part of the small intestine is most commonly affected?
What is the minimum duration of stool frequency and/or fluidity to define persistent diarrhea in infants?
A child presents with complaints of oliguria, abdominal distension, and diarrhea. On examination, there is deep jaundice. Hepatomegaly was present, measuring 4 cm below the costal margin. Conjugated bilirubin in blood was 38 mg/dL, and there were urine urobilinogen and bile pigments. Hemoglobin was 4 g/dL and serum creatinine was 3 mg/dL. Which of the following tests is of least importance to diagnose this case?
Dehydration in a child with diarrhea, thirst present, and absent tears is classified as which of the following?
A baby born at term develops abdominal distention in the first week of life. Meconium ileus is diagnosed. Subsequently, the infant has persistent steatorrhea and fails to develop normally. Which of the following laboratory test findings is most likely related to the infant's underlying disease?
An infant was brought to the casualty with complaints of watery diarrhoea and vomiting. He had mild fever. What is the MOST common cause of acute infantile gastroenteritis?
What does Hirschsprung's disease involve?
An asymptomatic 3-year-old child presents with acute onset right cheek swelling that is erythematous but not warm to touch. On palpation, mildly tender, discrete, indurated masses are appreciated. What is the most likely cause of this presentation?
An 8-year-old boy presents with a history of abdominal pain that is exacerbated during the week and lessens on weekends. His growth and development are normal. He has one soft stool daily without painful defecation. Physical examination is unremarkable, and laboratory investigations including stool for occult blood, CBC, urinalysis, and chemistry panel are within normal limits. What is the most appropriate next step in managing this patient?
A 3-day-old male baby vomits everything he feeds, has a distended abdomen and diarrhea. On examination, he has bilateral cataracts. The urine is positive for Benedict's test for reducing substances. Which of the following is the probable underlying diagnosis?
Gastroenterology Indian Medical PG Practice Questions and MCQs
Question 131: In cystic fibrosis of the pancreas, which part of the small intestine is most commonly affected?
- A. Jejunum
- B. Ileum (Correct Answer)
- C. Ascending colon
- D. Descending colon
Explanation: **Explanation:** The correct answer is **B. Ileum**. In **Cystic Fibrosis (CF)**, the primary defect lies in the **CFTR protein**, which leads to the production of abnormally thick, dehydrated, and viscid secretions. In the gastrointestinal tract, these secretions, combined with pancreatic insufficiency (lack of enzymes like trypsin), result in inspissated (thickened) meconium. The **terminal ileum** is the most common site of involvement because it is the narrowest part of the small intestine and where the meconium becomes most concentrated. This leads to **Meconium Ileus**, a classic neonatal presentation of CF characterized by intestinal obstruction. **Analysis of Incorrect Options:** * **A. Jejunum:** While the jejunum is involved in nutrient absorption, it has a wider lumen and more liquid content compared to the ileum, making it a less common site for primary obstruction in CF. * **C & D. Colon:** Although CF can lead to "Distal Intestinal Obstruction Syndrome" (DIOS) in older children (often involving the cecum/ascending colon), the hallmark pathological site specifically associated with the classic neonatal manifestation of CF is the ileum. **High-Yield Clinical Pearls for NEET-PG:** * **Meconium Ileus:** Occurs in 15-20% of CF neonates. It is often the first clinical sign of the disease. * **Radiology:** X-ray may show a "soap-bubble" appearance (Neuhauser sign) in the right lower quadrant due to air mixing with thick meconium. * **Microcolon:** On contrast enema, a "microcolon" (disuse atrophy) is often seen distal to the ileal obstruction. * **Genetics:** Most common mutation is **ΔF508** on Chromosome 7. * **Gold Standard Diagnosis:** Sweat Chloride Test (>60 mEq/L).
Question 132: What is the minimum duration of stool frequency and/or fluidity to define persistent diarrhea in infants?
- A. 7 days
- B. 1 month
- C. 21 days
- D. 14 days (Correct Answer)
Explanation: **Explanation:** Diarrhea in children is classified based on duration into three distinct categories. The correct answer is **14 days**, as this is the standard clinical threshold defined by the World Health Organization (WHO) and pediatric guidelines to differentiate acute episodes from prolonged ones. * **Acute Diarrhea:** Lasts less than 14 days. Most cases are viral (e.g., Rotavirus) and self-limiting. * **Persistent Diarrhea:** Defined as an episode of diarrhea, with or without blood, that begins acutely but lasts for **14 days or more**. It is often associated with secondary lactose intolerance, bovine milk protein allergy, or mucosal damage leading to malabsorption. * **Chronic Diarrhea:** Typically refers to diarrhea lasting longer than **30 days (4 weeks)**, often due to non-infectious causes like Celiac disease or Inflammatory Bowel Disease (IBD). **Why other options are incorrect:** * **7 days:** This falls within the range of acute diarrhea. * **21 days:** While this is "persistent," the *minimum* duration required for the definition is 14 days. * **1 month:** This is the threshold for "Chronic Diarrhea," which usually implies a different underlying pathophysiology compared to persistent diarrhea. **High-Yield Clinical Pearls for NEET-PG:** * **Persistent Diarrhea vs. Chronic Diarrhea:** Persistent diarrhea starts as an acute infectious episode, whereas chronic diarrhea is often insidious and non-infectious. * **Management:** The mainstay of management for persistent diarrhea is nutritional rehabilitation (e.g., low-lactose diet) and Zinc supplementation. * **Mortality:** Persistent diarrhea accounts for only ~10% of diarrhea cases but contributes to nearly **35-50% of all diarrhea-related deaths** due to severe malnutrition and secondary infections.
Question 133: A child presents with complaints of oliguria, abdominal distension, and diarrhea. On examination, there is deep jaundice. Hepatomegaly was present, measuring 4 cm below the costal margin. Conjugated bilirubin in blood was 38 mg/dL, and there were urine urobilinogen and bile pigments. Hemoglobin was 4 g/dL and serum creatinine was 3 mg/dL. Which of the following tests is of least importance to diagnose this case?
- A. G6PD level in blood
- B. Serum ceruloplasmin (Correct Answer)
- C. Reticulocyte count
- D. Leptospiral antibody level
Explanation: The clinical presentation describes a child with **acute fulminant illness** characterized by the triad of **severe jaundice (conjugated hyperbilirubinemia), acute kidney injury (oliguria, high creatinine), and severe anemia (Hb 4 g/dL).** ### Why Serum Ceruloplasmin is the Least Important **Serum ceruloplasmin** is the screening test for **Wilson Disease**. While Wilson disease can present with acute liver failure and Coombs-negative hemolytic anemia, it typically occurs in older children (rarely under 5 years) and is characterized by **unconjugated hyperbilirubinemia** (due to hemolysis) and low alkaline phosphatase. In this acute, febrile-sounding presentation with multi-organ involvement (renal + hepatic), Wilson disease is the least likely diagnosis compared to acute infections or hematologic crises. ### Evaluation of Other Options * **G6PD level & Reticulocyte count:** The patient has severe anemia (4 g/dL) and jaundice. A G6PD deficiency trigger (infection/drugs) can cause a **hemolytic crisis** leading to hemoglobinuric acute tubular necrosis (renal failure). Reticulocyte count is essential to confirm hemolysis. * **Leptospiral antibody level:** This is a high-yield diagnosis for this triad. **Weil’s Disease (Leptospirosis)** classically presents with fever, diarrhea, hepatorenal syndrome (jaundice + oliguria), and hemorrhage/anemia. ### NEET-PG High-Yield Pearls * **Weil’s Syndrome Triad:** Jaundice, Renal Failure, and Hemorrhage (Leptospirosis). * **Conjugated Hyperbilirubinemia (>20% of total):** Always pathological; suggests hepatocellular damage or biliary obstruction, not simple hemolysis. * **Wilson Disease Presentation:** Suspect in any child >5 years with unexplained liver disease or neurological symptoms. The gold standard for diagnosis is a **liver biopsy** for copper content, though ceruloplasmin is the initial screen.
Question 134: Dehydration in a child with diarrhea, thirst present, and absent tears is classified as which of the following?
- A. Moderate dehydration (Correct Answer)
- B. Mild dehydration
- C. Severe dehydration
- D. None of the above
Explanation: This question tests the clinical assessment of dehydration in children based on the **WHO Integrated Management of Neonatal and Childhood Illness (IMNCI)** guidelines, which is a high-yield topic for NEET-PG. ### **Explanation** The classification of dehydration is based on specific clinical signs. According to WHO/IMNCI criteria: 1. **Thirst Present:** The child drinks eagerly or is thirsty. 2. **Absent Tears:** A sign of reduced fluid volume in the mucous membranes/secretions. These two features, along with others like sunken eyes and restlessness/irritability, categorize the child into **Some Dehydration** (clinically equivalent to **Moderate Dehydration**). ### **Analysis of Options** * **Option A (Correct):** Moderate (Some) dehydration is diagnosed when two or more of the following are present: restlessness/irritability, sunken eyes, drinking eagerly/thirsty, and a skin pinch that goes back slowly. * **Option B (Incorrect):** In Mild (No) dehydration, there are not enough signs to classify as some or severe dehydration. The child is usually alert, tears are present, and they drink normally. * **Option C (Incorrect):** Severe dehydration is characterized by lethargy or unconsciousness, inability to drink or drinking poorly, very sunken eyes, and a skin pinch that retracts very slowly (>2 seconds). * **Option D (Incorrect):** This is a standard classification; hence, "None of the above" is invalid. ### **High-Yield Clinical Pearls for NEET-PG** * **Fluid Management:** * **No Dehydration:** Plan A (Home-based fluids/ORS). * **Some (Moderate) Dehydration:** Plan B (75 ml/kg of ORS over 4 hours). * **Severe Dehydration:** Plan C (IV fluids - Ringer’s Lactate is the fluid of choice). * **Best Indicator:** The most accurate clinical indicator of the degree of dehydration is **percentage of body weight loss**. * **Key Sign:** "Restlessness/Irritability" is a feature of Some Dehydration, whereas "Lethargy" is a hallmark of Severe Dehydration.
Question 135: A baby born at term develops abdominal distention in the first week of life. Meconium ileus is diagnosed. Subsequently, the infant has persistent steatorrhea and fails to develop normally. Which of the following laboratory test findings is most likely related to the infant's underlying disease?
- A. Decreased serum thyroxine level
- B. Positive HIV serology
- C. Elevated sweat chloride (Correct Answer)
- D. Increased urine homovanillic acid level
Explanation: **Explanation:** The clinical presentation of **Meconium Ileus** (failure to pass meconium, abdominal distention, and intestinal obstruction) in a neonate is the classic initial manifestation of **Cystic Fibrosis (CF)**. The subsequent development of **steatorrhea** (foul-smelling, oily stools) and **failure to thrive** indicates pancreatic exocrine insufficiency, where thick secretions block pancreatic ducts, preventing digestive enzymes from reaching the duodenum. **Why the correct answer is right:** Cystic Fibrosis is caused by a mutation in the **CFTR gene** (most commonly ΔF508). This defect leads to impaired chloride transport across epithelial membranes. In sweat glands, the inability to reabsorb chloride results in excessively "salty" sweat. The **Pilocarpine Iontophoresis Sweat Chloride Test** (Value >60 mmol/L) remains the gold standard for diagnosis. **Why incorrect options are wrong:** * **A. Decreased serum thyroxine:** This indicates Congenital Hypothyroidism. While it causes constipation and failure to thrive, it does not cause meconium ileus or steatorrhea. * **B. Positive HIV serology:** Pediatric HIV presents with recurrent infections and failure to thrive, but not with neonatal intestinal obstruction. * **D. Increased urine homovanillic acid (HVA):** This is a marker for **Neuroblastoma**. While it can present as an abdominal mass, it is not associated with meconium ileus or malabsorption. **NEET-PG High-Yield Pearls:** * **Meconium Ileus** is pathognomonic for CF (seen in ~15-20% of CF patients). * **Radiology:** "Soap-bubble" appearance (Neuhauser sign) in the right iliac fossa due to air mixing with thick meconium. * **Genetics:** Autosomal Recessive; CFTR gene located on **Chromosome 7**. * **Other manifestations:** Recurrent pneumonia (Pseudomonas), nasal polyps, and infertility (bilateral absence of vas deferens).
Question 136: An infant was brought to the casualty with complaints of watery diarrhoea and vomiting. He had mild fever. What is the MOST common cause of acute infantile gastroenteritis?
- A. Adenovirus
- B. Norwalk virus
- C. Rotavirus (Correct Answer)
- D. Influenza virus
Explanation: **Explanation:** **1. Why Rotavirus is the Correct Answer:** Rotavirus is the **most common cause of severe, dehydrating diarrhea** in infants and young children worldwide. It typically presents with a prodrome of fever and vomiting, followed by non-bloody, watery diarrhea. The virus primarily infects the mature enterocytes of the small intestine, leading to malabsorption and osmotic diarrhea. In the context of "acute infantile gastroenteritis," Rotavirus remains the classic and most frequent pathogen tested in exams, despite the successful rollout of the Rotavirus vaccine (RV1 and RV5) which has significantly reduced its incidence. **2. Why the Other Options are Incorrect:** * **Adenovirus (Serotypes 40/41):** These are the second most common viral causes of gastroenteritis in children. However, they are less frequent than Rotavirus and often cause a more prolonged, less severe illness. * **Norwalk virus (Norovirus):** While Norovirus is the leading cause of gastroenteritis outbreaks across **all age groups** (especially in adults and older children in closed settings like cruise ships or schools), it is not the most common cause specifically in the *infantile* age group compared to Rotavirus. * **Influenza virus:** This is primarily a respiratory pathogen. While it can cause systemic symptoms like fever and occasionally GI upset in children, it is not a primary cause of acute gastroenteritis. **3. High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Rotavirus produces a viral enterotoxin called **NSP4**, which induces secretion by increasing intracellular calcium. * **Seasonality:** Peak incidence occurs in **winter months** (temperate climates). * **Diagnosis:** The gold standard for rapid diagnosis is detecting the viral antigen in stools via **ELISA** or Latex Agglutination. * **Vaccination:** Rotavirus vaccines are **live-attenuated** and administered **orally**. They are contraindicated in children with a history of intussusception or SCID.
Question 137: What does Hirschsprung's disease involve?
- A. Peptides
- B. Bile salts
- C. Meissner and Auerbach plexus deficiency (Correct Answer)
- D. Vagus nerve excess
Explanation: ### Explanation **Hirschsprung’s Disease (Congenital Aganglionic Megacolon)** is a developmental disorder characterized by the failure of neural crest cells to migrate cranio-caudally during the 5th to 12th week of gestation. **Why Option C is Correct:** The hallmark of the disease is the **absence of ganglion cells** in the **Meissner (submucosal)** and **Auerbach (myenteric)** plexuses. This aganglionosis typically begins at the internal anal sphincter and extends proximally for a variable distance (most commonly involving the rectosigmoid). The lack of these plexuses leads to a failure of relaxation in the affected segment, resulting in functional bowel obstruction and proximal dilation (megacolon). **Why Other Options are Incorrect:** * **A & B (Peptides and Bile salts):** These are involved in digestion and absorption but have no primary role in the pathogenesis of Hirschsprung’s disease, which is a neuro-anatomical defect. * **D (Vagus nerve excess):** While there is a compensatory hypertrophy of extrinsic cholinergic nerve fibers in the aganglionic segment, the disease is defined by a *deficiency* of intrinsic plexuses, not an excess of the vagus nerve. **High-Yield Clinical Pearls for NEET-PG:** * **Presentation:** Delayed passage of meconium (>48 hours), abdominal distension, and bilious vomiting. * **Diagnosis:** **Rectal Suction Biopsy** is the Gold Standard (shows absence of ganglion cells and increased Acetylcholinesterase staining). * **Radiology:** Barium enema shows a "transition zone" (narrow aganglionic segment vs. dilated proximal colon). * **Associated Condition:** Strongly associated with **Down Syndrome** (Trisomy 21) and mutations in the **RET proto-oncogene**. * **Physical Exam:** "Blast sign" or "Squirt sign" (explosive release of stool/gas on digital rectal exam).
Question 138: An asymptomatic 3-year-old child presents with acute onset right cheek swelling that is erythematous but not warm to touch. On palpation, mildly tender, discrete, indurated masses are appreciated. What is the most likely cause of this presentation?
- A. Erysipelas
- B. Cellulitis
- C. Trauma
- D. Panniculitis (Correct Answer)
Explanation: **Explanation:** The clinical presentation describes **Popsicle Panniculitis**, a form of cold-induced subcutaneous fat necrosis. In young children, the high concentration of saturated fats in subcutaneous tissue makes it susceptible to crystallization and inflammation when exposed to cold (e.g., sucking on a popsicle or ice cube). **1. Why Panniculitis is correct:** The hallmark of this condition is the **acute onset** of erythematous, indurated, and mildly tender nodules or plaques, typically located on the cheeks (near the corners of the mouth). The key diagnostic clue is that the area is **not warm to touch**, distinguishing it from infectious processes. It is a self-limiting condition that resolves spontaneously within weeks. **2. Why other options are incorrect:** * **Erysipelas & Cellulitis:** These are bacterial infections (usually *S. pyogenes* or *S. aureus*). They present with "calor" (warmth) and systemic symptoms like fever. The absence of warmth and the child being asymptomatic (afebrile) makes an infectious etiology unlikely. * **Trauma:** While trauma can cause swelling, it usually presents with ecchymosis (bruising) and significant tenderness rather than discrete, indurated masses. **Clinical Pearls for NEET-PG:** * **Target Population:** Most common in infants and toddlers due to higher **saturated-to-unsaturated fat ratios**. * **Differential Diagnosis:** Must be distinguished from **Facial Cellulitis** (which is warm, painful, and often associated with fever). * **Management:** Reassurance only; no active treatment is required as it is a benign, self-resolving condition. * **Other Cold Panniculitis:** Can also occur on the thighs of equestrians ("Equestrian Panniculitis") due to cold weather and tight clothing.
Question 139: An 8-year-old boy presents with a history of abdominal pain that is exacerbated during the week and lessens on weekends. His growth and development are normal. He has one soft stool daily without painful defecation. Physical examination is unremarkable, and laboratory investigations including stool for occult blood, CBC, urinalysis, and chemistry panel are within normal limits. What is the most appropriate next step in managing this patient?
- A. Upper gastrointestinal series with small bowel follow-through
- B. CT scan of the abdomen with contrast
- C. Trial of a proton pump inhibitor
- D. Observe and reassure the patient and family (Correct Answer)
Explanation: ### Explanation The clinical presentation is classic for **Functional Abdominal Pain (FAP)**, a common condition in school-aged children. The diagnosis is supported by the "Red Flag-free" history: normal growth and development, normal physical examination, and negative baseline investigations (CBC, UA, occult blood). **Why Option D is Correct:** The temporal pattern (worsening during the school week and improving on weekends) strongly suggests a **psychosocial stressor** or school-related anxiety rather than organic pathology. In a child with normal growth and no "alarm symptoms" (like weight loss, nocturnal pain, or GI bleeding), the most appropriate management is to avoid unnecessary invasive testing and provide **reassurance**. The goal is to return the child to normal activities while acknowledging that the pain is real but not life-threatening. **Why Other Options are Incorrect:** * **Options A & B:** Imaging (UGI series or CT scan) is not indicated in the absence of alarm symptoms (e.g., vomiting, palpable mass, or localized tenderness). These tests expose the child to unnecessary radiation and cost without changing management. * **Option C:** A trial of PPIs is used for suspected Gastroesophageal Reflux Disease (GERD) or Peptic Ulcer Disease. This patient’s pain is not described as epigastric or postprandial, and the weekend improvement points away from acid-peptic disease. ### NEET-PG High-Yield Pearls * **Rome IV Criteria:** Functional GI disorders are diagnosed based on clinical criteria when no organic cause is found. * **Red Flags (Indicating Organic Disease):** Persistent right upper or lower quadrant pain, dysphagia, persistent vomiting, unexplained fever, family history of IBD, and growth failure. * **Management Tip:** For functional pain, the focus is on "biopsychosocial" factors. Reassurance and maintaining a regular school routine are the first-line treatments.
Question 140: A 3-day-old male baby vomits everything he feeds, has a distended abdomen and diarrhea. On examination, he has bilateral cataracts. The urine is positive for Benedict's test for reducing substances. Which of the following is the probable underlying diagnosis?
- A. Hereditary fructose intolerance
- B. Phenylketonuria
- C. Galactosemia (Correct Answer)
- D. Von Gierke disease
Explanation: ### Explanation **Correct Option: C. Galactosemia** The clinical triad of **early-onset vomiting/diarrhea**, **abdominal distension (hepatomegaly)**, and **bilateral cataracts** in a neonate is classic for Classic Galactosemia (deficiency of Galactose-1-phosphate uridyltransferase - GALT). * **Pathophysiology:** When the infant starts breastfeeding (lactose contains glucose + galactose), galactose metabolites (galactitol) accumulate. Galactitol in the lens causes osmotic swelling, leading to **oil-drop cataracts**. * **Biochemical Marker:** Galactose is a reducing sugar. Therefore, the urine is **positive for Benedict’s test** (reducing substances) but **negative for the glucose oxidase test** (dipstick), which is specific for glucose. --- ### Why the other options are incorrect: * **A. Hereditary Fructose Intolerance:** Symptoms (hypoglycemia, vomiting) only appear after the introduction of fructose or sucrose (e.g., fruit juices or honey). A 3-day-old on breast milk would not manifest this, as breast milk contains lactose, not fructose. * **B. Phenylketonuria (PKU):** Presents later with intellectual disability, "mousy" odor, and fair skin. It does not cause cataracts or positive Benedict's test in urine. * **D. Von Gierke Disease (GSD Type I):** Presents at 3–6 months with severe fasting hypoglycemia and doll-like facies. It does not cause cataracts. --- ### NEET-PG High-Yield Pearls: * **Most common enzyme deficiency:** GALT (Classic Galactosemia). * **First sign:** Cataracts (can be present within days of birth). * **Increased risk of Sepsis:** These infants are highly susceptible to **E. coli neonatal sepsis**. * **Treatment:** Immediate withdrawal of breast milk and lifelong soy-based or lactose-free formula. * **Screening:** Benedict’s test is a non-specific screening tool for reducing sugars (Galactose, Fructose, Lactose, Pentose).
Practice by Chapter
Gastroesophageal Reflux
Practice Questions
Peptic Ulcer Disease
Practice Questions
Inflammatory Bowel Disease
Practice Questions
Celiac Disease
Practice Questions
Malabsorption Syndromes
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Acute and Chronic Diarrhea
Practice Questions
Constipation and Encopresis
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Gastrointestinal Bleeding
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Intestinal Obstruction
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Liver Diseases in Children
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Pancreatic Disorders
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Pediatric Nutritional Support
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