Gastrointestinal Tract Imaging — MCQs
Mark the correct statement regarding inflammatory bowel disease.
What is the best imaging modality for detecting early osteomyelitis?
In which of the following conditions is the lead pipe appearance of the colon seen on a barium enema?
Which of the following findings is NOT associated with carcinoma of the esophagus?
A 55-year-old man has a history of difficulty swallowing and frequent choking while eating. A barium swallow shows a posterior pharyngeal diverticulum. What is the most likely diagnosis?
Thumb print sign in a plain X-ray is seen in:
Which of the following statements about CT imaging is the MOST accurate?
What is the investigation of choice in a patient with blunt abdominal trauma with hematuria?
A 60-year-old male with a history of smoking presents with severe abdominal pain and a pulsatile abdominal mass. What is the most appropriate next step in managing this patient?
A 35-year-old construction worker presents with a 3-month history of abdominal pain, fatigue, and recent onset of numbness and tingling in his hands and feet. He works in renovation of old buildings. Physical examination reveals mild pallor and decreased sensation in a stocking-glove distribution. Blood tests show microcytic anemia with basophilic stippling on peripheral smear. What is the most likely diagnosis?
Gastrointestinal Tract Imaging Indian Medical PG Practice Questions and MCQs
Question 1: Mark the correct statement regarding inflammatory bowel disease.
- A. Skip lesions are present in Crohn's disease (Correct Answer)
- B. Inflammatory bowel disease doesn't have a genetic predisposition
- C. Crohn's is curable through surgical resection of the affected segment
- D. Mucosal layers are involved in Crohn's while transmural involvement seen in ulcerative colitis
Explanation: ***Skip lesions are present in Crohn's disease*** - **Skip lesions** refer to the characteristic patchy, discontinuous areas of inflammation seen in **Crohn's disease**, where affected segments of the bowel are separated by healthy areas. - This feature is a key differentiator from ulcerative colitis, which typically exhibits **continuous inflammation**. *Inflammatory bowel disease doesn't have a genetic predisposition* - **Genetic predisposition** plays a significant role in both Crohn's disease and ulcerative colitis, with multiple genes identified that increase susceptibility. - A family history of IBD is a well-established risk factor, indicating its genetic component. *Crohn's is curable through surgical resection of the affected segment* - Crohn's disease is a **chronic, relapsing condition** that can affect any part of the gastrointestinal tract, and while surgery can remove affected segments, it is not curative. - Disease often **recurs in other parts** of the GI tract even after surgical resection. *Mucosal layers are involved in Crohn's while transmural involvement seen in ulcerative colitis* - This statement is incorrect; **Crohn's disease** is characterized by **transmural inflammation** (involving all layers of the bowel wall). - **Ulcerative colitis** primarily affects the **mucosal and submucosal layers** of the large intestine.
Question 2: What is the best imaging modality for detecting early osteomyelitis?
- A. CT scan
- B. X-ray
- C. MRI (Correct Answer)
- D. Bone scintigraphy
Explanation: ***MRI*** - **Magnetic Resonance Imaging (MRI)** is considered the **gold standard** for detecting early osteomyelitis due to its excellent soft tissue contrast and ability to visualize **bone marrow edema**, which is an early sign of infection. - It can identify changes within **3-5 days** of infection onset, much earlier than other modalities. *CT scan* - While useful for showing **bone destruction**, cortical integrity, and sequestra, **CT scans** are less sensitive than MRI for detecting early marrow edema. - Its ability to diagnose osteomyelitis is usually delayed until significant **bony changes** have occurred, typically around 1-2 weeks. *X-ray* - **Plain radiographs** are often the initial imaging study but are **insensitive** for early osteomyelitis, showing changes only after 10-14 days or more. - Early findings on X-rays can be subtle, such as **periosteal elevation** or **soft tissue swelling**, but frank bone destruction is a late finding. *Bone scintigraphy* - **Bone scintigraphy** (e.g., technetium-99m) is sensitive for detecting increased bone turnover associated with infection but lacks **specificity**, as it can be positive in other conditions like trauma or tumors. - While it can detect changes earlier than X-rays, typically within 2-3 days, it cannot clearly differentiate infection from other processes, and its spatial resolution is poor compared to MRI.
Question 3: In which of the following conditions is the lead pipe appearance of the colon seen on a barium enema?
- A. Amoebiasis
- B. Ulcerative colitis (Correct Answer)
- C. Tuberculosis of the colon
- D. Crohn's involvement of the colon
Explanation: **Ulcerative colitis** - The **"lead pipe" appearance** on a barium enema is indicative of **loss of haustra**, foreshortening, and rigidity of the colon due to chronic inflammation and fibrosis, which are characteristic features of extensive ulcerative colitis. - This appearance reflects a smooth, tube-like colon without the normal sacculations, resulting from **mucosal damage** and subsequent scarring. *Amoebiasis* - While amoebiasis can cause colonic inflammation, it typically presents with **flask-shaped ulcers** and sometimes strictures on barium enema, not a diffuse loss of haustra leading to a "lead pipe" appearance. - The disease is more commonly associated with changes like **filling defects** or **segmental narrowing** rather than overall colonic rigidity. *Tuberculosis of the colon* - Tuberculosis of the colon often causes **strictures**, ulcerations, and sometimes **hypertrophic lesions**, particularly affecting the ileocecal region. - It does not typically result in the widespread mucosal damage and loss of haustra seen in the "lead pipe" appearance of ulcerative colitis, but rather **focal deformities**. *Crohn's involvement of the colon* - Crohn's disease is characterized by a **"cobblestoned" appearance** due to deep ulcerations and transmural inflammation, skip lesions, and **fistulae**. - While it can cause strictures and bowel wall thickening, the diffuse loss of haustra leading to the "lead pipe" sign is more specific to **ulcerative colitis**, which primarily affects the mucosa.
Question 4: Which of the following findings is NOT associated with carcinoma of the esophagus?
- A. Edges of filling defect are not clear-cut
- B. Distortion of the esophageal lumen
- C. Esophageal varices (Correct Answer)
- D. Irregular "rat-tail" filling defect of the distal esophagus
Explanation: ***Esophageal varices*** - **Esophageal varices** are typically a complication of **portal hypertension**, often due to cirrhosis of the liver, not directly caused by esophageal carcinoma [1]. - While both can occur in the esophagus, varices represent dilated submucosal veins and are distinct from a primary malignant tumor. *Distortion of the esophageal lumen* - Carcinoma of the esophagus often causes **stenosis** or **obstruction**, leading to a distorted lumen as the tumor grows and invades the esophageal wall [2]. - This distortion can be seen on imaging as an irregular narrowing or fixed filling defect. *Edges of filling defect are not clear-cut* - The **infiltrative nature** of esophageal carcinoma results in **ragged, ill-defined tumor margins** and irregular filling defects when viewed on barium swallow [2]. - Unlike benign lesions, malignant tumors typically lack clear, sharp borders. *Irregular "rat-tail" filling defect of the distal esophagus* - An **irregular "rat-tail" appearance** in the distal esophagus on barium swallow is characteristic of certain types of esophageal carcinoma, particularly those involving the gastroesophageal junction [2]. - This describes a tapered, irregular narrowing indicative of an infiltrating lesion. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 396-398. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 765-767.
Question 5: A 55-year-old man has a history of difficulty swallowing and frequent choking while eating. A barium swallow shows a posterior pharyngeal diverticulum. What is the most likely diagnosis?
- A. Zenker's diverticulum (Correct Answer)
- B. Esophageal stricture
- C. GERD
- D. Achalasia
Explanation: ***Zenker's diverticulum*** - A **Zenker's diverticulum** is a **pseudodiverticulum** that occurs due to herniation of the pharyngeal mucosa at Killian's triangle, often causing dysphagia and regurgitation in older adults. - The **barium swallow** revealing a **posterior pharyngeal diverticulum** is a classic finding for Zenker's, and the symptoms of difficulty swallowing and choking are consistent with food lodging in the pouch. *Esophageal stricture* - An **esophageal stricture** is a narrowing of the esophagus, which would cause difficulty swallowing (dysphagia), but typically wouldn't lead to a **posterior pharyngeal diverticulum** on barium swallow. - While strictures can cause choking, the primary finding described in the barium swallow points away from a simple stricture. *GERD* - **Gastroesophageal reflux disease (GERD)** can cause dysphagia due to **esophagitis** or stricture formation, but it is not typically associated with a **posterior pharyngeal diverticulum**. - The main symptoms of GERD include **heartburn** and acid regurgitation, though atypical symptoms exist, the diverticulum is not characteristic. *Achalasia* - **Achalasia** is a motility disorder characterized by impaired relaxation of the **lower esophageal sphincter** and loss of peristalsis in the esophageal body, leading to dysphagia and regurgitation. - A barium swallow in achalasia typically shows a **dilated esophagus** with a "bird's beak" appearance at the LES, not a posterior pharyngeal diverticulum.
Question 6: Thumb print sign in a plain X-ray is seen in:
- A. Ulcerative colitis
- B. Pseudomembranous colitis
- C. Appendicitis
- D. Ischemic colitis (Correct Answer)
Explanation: ***Ischemic colitis*** - The **thumbprint sign** on a plain X-ray or CT scan is characteristic of ischemic colitis, resulting from submucosal edema and hemorrhage. - This appearance is due to the thickened, edematous **haustral folds** projecting into the colonic lumen. *Ulcerative colitis* - While it affects the colon, classic imaging findings for ulcerative colitis include **loss of haustral folds** (lead pipe sign) and pseudopolyps, not the thumbprint sign. - **Toxic megacolon** is a severe complication, identifiable by colonic dilation and wall thickening, distinct from thumbprint sign. *Pseudomembranous colitis* - This condition is caused by *Clostridioides difficile* infection and typically manifests with **thickened, nodular colonic walls** or inflammatory pseudomembranes on imaging. - It does not typically present with the classic "thumbprint" appearance indicative of ischemic changes. *Appendicitis* - Appendicitis is an inflammation of the appendix, diagnosed usually by findings like a **dilated appendix** with surrounding fat stranding on imaging. - The imaging findings are localized to the right lower quadrant and do not involve diffuse colonic changes like the "thumbprint sign."
Question 7: Which of the following statements about CT imaging is the MOST accurate?
- A. Water has a Hounsfield unit (HU) of zero. (Correct Answer)
- B. CT head dose remains constant regardless of the protocol used.
- C. CT cannot detect gallstones under any circumstances.
- D. CT uses unfiltered x-ray beams.
Explanation: ***Water has a Hounsfield unit (HU) of zero.*** - The **Hounsfield unit (HU)** scale is a quantitative scale used to describe radiodensity in CT scans, where **water is defined as 0 HU**. - This establishes a crucial reference point for measuring the attenuation of other tissues, which can range from approximately **-1000 HU for air** to **+1000 HU or more for dense bone**. *CT head dose remains constant regardless of the protocol used.* - The **radiation dose** in CT scans is highly variable and depends significantly on the **protocol used**, including factors like mA, kVp, pitch, and scan length. - **Dose optimization techniques** and protocol adjustments are routinely employed to minimize patient exposure while maintaining diagnostic image quality. *CT cannot detect gallstones under any circumstances.* - While **ultrasound (US)** is the primary modality for detecting gallstones, CT can visualize them, especially if they are **calcified** or of mixed composition. - **Non-calcified gallstones** may be more challenging to detect on CT, but they are not impossible to see, particularly with current generation scanners and appropriate windowing. *CT uses unfiltered x-ray beams.* - CT scanners use **filtered x-ray beams** to provide higher quality images and reduce patient dose. - **Filtration (e.g., aluminum or copper)** removes low-energy x-rays, which would otherwise be absorbed by the patient without contributing to image formation.
Question 8: What is the investigation of choice in a patient with blunt abdominal trauma with hematuria?
- A. Contrast enhanced computed tomography (Correct Answer)
- B. Retrograde urogram
- C. Intravenous urogram
- D. Ultrasonography of abdomen
Explanation: ***Contrast enhanced computed tomography (CECT)*** - **CECT** is the **investigation of choice** for evaluating solid organ injuries, including renal trauma, in hemodynamically stable patients with blunt abdominal trauma and hematuria. - It provides detailed imaging of the kidneys, urinary tract, and surrounding structures, allowing for the classification of injury severity and identification of associated injuries. *Retrograde urogram* - A retrograde urogram is primarily used to evaluate the **lower urinary tract** (urethra and bladder) for strictures or injuries, specifically when there is a suspicion of urethral injury. - It is not the primary imaging modality for assessing renal parenchymal or collecting system injuries from blunt trauma. *Intravenous urogram (IVU)* - While an IVU can assess the upper urinary tract, it has largely been replaced by **CECT** in the acute trauma setting due to CECT's superior resolution and ability to evaluate renal parenchyma and other abdominal organs. - IVU exposes the patient to radiation and requires contrast administration, and it may not adequately visualize subtle renal injuries or hematomas as effectively as CECT. *Ultrasonography of abdomen* - **Ultrasound** is useful for rapidly detecting free fluid (suggesting hemorrhage) or gross hydronephrosis in trauma, but it has limited sensitivity for diagnosing specific renal parenchymal injuries or urinary extravasation. - Its role in blunt abdominal trauma with hematuria is often as an initial screening tool, but it is not sufficient for definitive diagnosis or grading of renal injuries.
Question 9: A 60-year-old male with a history of smoking presents with severe abdominal pain and a pulsatile abdominal mass. What is the most appropriate next step in managing this patient?
- A. Immediate surgery
- B. CT angiography (Correct Answer)
- C. Ultrasound of the abdomen
- D. Observation
Explanation: ***CT angiography*** - **CT angiography** is the most appropriate next step for a **hemodynamically stable** patient with suspected **abdominal aortic aneurysm (AAA)**, as suggested by severe abdominal pain and a pulsatile abdominal mass in a smoker. - **CT angiography** is the gold standard for delineating the size, extent, anatomical relationships, and most importantly, the **rupture status** of an AAA, providing critical information for surgical planning. - This imaging is essential for determining the appropriate surgical approach (open repair vs. endovascular repair/EVAR) and identifying contained ruptures that may not be immediately life-threatening but require urgent intervention. - The patient presentation suggests a **symptomatic or contained rupture**, and assuming hemodynamic stability, imaging should precede surgery. *Immediate surgery* - Immediate surgery **without imaging** is indicated only when the patient is **hemodynamically unstable** (hypotension, shock) or in frank rupture with peritoneal signs, where delays for imaging would be fatal. - In a **stable** patient, proceeding directly to surgery without CT angiography increases operative risks due to lack of precise anatomical information about aneurysm size, location, proximal/distal extent, and involvement of renal or iliac arteries. - The question scenario, while concerning, does not explicitly indicate hemodynamic instability, making imaging the preferred next step. *Ultrasound of the abdomen* - **Ultrasound** is excellent for screening and confirming the presence of AAA, measuring aortic diameter, but it has significant limitations in acute settings. - **Ultrasound cannot reliably detect rupture** or provide the detailed anatomical information necessary for surgical planning (proximal/distal extent, branch vessel involvement). - In this acute presentation with suspected rupture, ultrasound would be insufficient and would delay definitive diagnosis, making **CT angiography** superior. *Observation* - **Observation** is absolutely contraindicated in a patient with severe abdominal pain and a pulsatile abdominal mass, as this presentation strongly suggests **symptomatic or ruptured AAA**. - AAA rupture carries mortality rates of 50-80% even with treatment, and any delay in diagnosis and intervention significantly increases mortality. - The combination of symptoms (severe pain) with a pulsatile mass in a high-risk patient (elderly male smoker) mandates immediate diagnostic workup, not observation.
Question 10: A 35-year-old construction worker presents with a 3-month history of abdominal pain, fatigue, and recent onset of numbness and tingling in his hands and feet. He works in renovation of old buildings. Physical examination reveals mild pallor and decreased sensation in a stocking-glove distribution. Blood tests show microcytic anemia with basophilic stippling on peripheral smear. What is the most likely diagnosis?
- A. Coeliac disease
- B. Sickle cell disease
- C. Lead poisoning (Correct Answer)
- D. Hookworm infestation
Explanation: **Lead poisoning** - The patient's occupation in **renovating old buildings** poses a significant risk for lead exposure [1]. - Classic symptoms of lead poisoning, such as **abdominal pain** [1], **fatigue**, **peripheral neuropathy** (numbness/tingling in stocking-glove distribution) [2], **pallor** [2], **microcytic anemia**, and **basophilic stippling** [1], are all present. *Coeliac disease* - While it can cause **abdominal pain** and **fatigue** due to malabsorption, it typically leads to **iron deficiency anemia**. - **Neuropathy** is less common and **basophilic stippling** is not a feature of coeliac disease. *Sickle cell disease* - Causes **hemolytic anemia** and painful crises, but is a genetic disorder typically diagnosed in childhood and presents with different symptoms. - While it can present with **fatigue** and **pallor**, **basophilic stippling** is not typical, and neuropathy in a stocking-glove distribution is rare. *Hookworm infestation* - Primarily causes **iron deficiency anemia** due to chronic blood loss from the gut, leading to **fatigue** and **pallor**. - It does not typically cause **basophilic stippling** or prominent **peripheral neuropathy** as described.
Want unlimited practice?
Get full access to all questions, explanations, and performance tracking.
Start For Free