Abdominal and Pelvic Radiology Practice Questions

Q: What is the investigation of choice to visualize the gallbladder?

Ultrasound (USG). **Explanation:** **Ultrasound (USG)** is the investigation of choice (IOC) for the gallbladder because it is highly sensitive (up to 95-98%) for detecting gallstones, non-invasive, cost-effective, and involves no ionizing radiation. It provides excellent visualization of the gallbladder wall thickness, pericholecystic fluid, and biliary sludge. Furthermore, it allows for the assessment of the **Sonographic Murphy’s Sign**, which is a highly specific clinical indicator of acute cholecystitis. **Analysis of Incorrect Options:** * **CT Scan:** While excellent for detecting complications (like perforation or gangrene) and evaluating the distal common bile duct, CT is less sensitive than USG for detecting radiolucent gallstones and is more expensive with significant radiation exposure. * **Plain X-ray:** Only about 10-15% of gallstones are radiopaque (calcium-containing) and visible on X-ray. It is largely obsolete for primary gallbladder evaluation. * **Oral Cholecystogram:** Historically used to assess gallbladder function and stones, it has been entirely replaced by USG due to its slow results, requirement for contrast ingestion, and poor reliability in patients with jaundice or malabsorption. **High-Yield Clinical Pearls for NEET-PG:** * **IOC for Gallstones/Cholecystitis:** Ultrasound. * **Gold Standard for Acute Cholecystitis:** HIDA Scan (Cholescintigraphy) – shows non-visualization of the GB. * **IOC for Choledocholithiasis (CBD stones):** MRCP (Magnetic Resonance Cholangiopancreatography). * **Gold Standard for CBD stones:** ERCP (Endoscopic Retrograde Cholangiopancreatography) – as it is both diagnostic and therapeutic. * **WES Triad (Wall-Echo-Shadow):** A classic USG finding indicating a gallbladder packed with stones.

Q: In the suppurative phase, a pyogenic liver abscess will appear as what on ultrasound?

Hyperechoic. **Explanation:** The sonographic appearance of a pyogenic liver abscess is dynamic and depends entirely on its stage of evolution. **Why Hyperechoic is Correct:** During the **early/suppurative phase** (also known as the formative or phlegmonous stage), the abscess consists of an inflammatory cell infiltrate, localized edema, and tissue congestion without a well-defined liquid center. This solid, heterogeneous inflammatory mass creates numerous acoustic interfaces, which reflect the ultrasound beam, resulting in a **hyperechoic** (bright) appearance. At this stage, it may mimic a solid tumor. **Why Other Options are Incorrect:** * **Hypoechoic/Cystic:** These appearances occur in the **liquefactive phase**. As the abscess matures, central necrosis and liquefaction occur, leading to a fluid-filled cavity that appears hypoechoic or anechoic (cystic) with posterior acoustic enhancement. * **Isoechoic:** While possible in very early stages, it is rarely the classic description for the suppurative phase and is difficult to distinguish from normal liver parenchyma. **High-Yield NEET-PG Pearls:** * **Most Common Cause:** In adults, the most common source is biliary tract disease (e.g., ascending cholangitis). * **Microbiology:** *E. coli* is the most common aerobic organism; *Klebsiella* is increasingly common in diabetics. * **Gas Formation:** If gas-forming organisms are present, you may see highly echogenic foci with **"dirty" shadowing** or the **"ring-down" artifact**. * **Amoebic vs. Pyogenic:** Amoebic abscesses are typically solitary, located in the right lobe, and usually present as well-defined hypoechoic masses (rarely hyperechoic).

Q: What is a typical ultrasound finding in chronic renal disease?

All of the above. **Explanation:** In the context of Chronic Kidney Disease (CKD), ultrasound findings are diverse and depend entirely on the underlying etiology. While the classic description of CKD is a **shrunken, echogenic kidney**, this is not a universal finding. 1. **Shrunken Kidney (Option C):** This is the most common finding in end-stage renal disease (ESRD) resulting from chronic glomerulonephritis, hypertensive nephrosclerosis, or chronic interstitial nephritis. It is characterized by a bipolar length of <9 cm and increased cortical echogenicity with loss of corticomedullary differentiation. 2. **Enlarged Kidney (Option A):** Certain chronic conditions lead to renal enlargement despite progressive loss of function. High-yield examples include **Autosomal Dominant Polycystic Kidney Disease (ADPKD)**, **Diabetic Nephropathy** (in early to mid-stages), **Amyloidosis**, and **HIV-associated nephropathy**. 3. **Normal Kidney (Option B):** In early stages of chronic disease or specific conditions like acute-on-chronic presentations, the kidney size may remain within normal limits (9–12 cm). **Conclusion:** Since CKD can present with small, normal, or large kidneys depending on the pathology, **"All of the above"** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Most reliable USG sign of CKD:** Increased cortical echogenicity (kidney appears brighter than the liver/spleen). * **CKD with Large Kidneys (Mnemonic: "SHAD"):** **S**cleroderma, **H**IV Nephropathy, **A**myloidosis, **D**iabetes, and **D**ominant Polycystic Kidney Disease. * **Exception:** In Diabetic Nephropathy, kidneys are initially enlarged due to hyperfiltration and only shrink in the very terminal stages.

Q: A plain X-ray abdomen is performed in a case of small bowel obstruction. Small bowel is considered dilated if its diameter is more than:

3 cm. In abdominal radiology, the **"3-6-9 Rule"** is the standard clinical guideline used to identify abnormal bowel dilatation on a plain X-ray. According to this rule, the upper limits of normal diameter for the bowel segments are: * **Small Bowel:** < 3 cm * **Large Bowel (Colon):** < 6 cm * **Cecum:** < 9 cm **Why 3 cm is correct:** A small bowel loop is considered pathologically dilated if its diameter measures **3 cm or more**. In the context of intestinal obstruction, this dilatation occurs due to the accumulation of gas and fluid proximal to the site of the block. On X-ray, this is often accompanied by the "valvulae conniventes" (plicae circulares) crossing the entire width of the lumen, giving a "stacked coin" appearance. **Analysis of incorrect options:** * **2 cm (Option A):** This is within the normal physiological range for small bowel loops. * **4 cm (Option C):** While 4 cm is definitely dilated, it is not the threshold value. The diagnostic cutoff starts at 3 cm. * **5 cm (Option D):** This represents significant dilatation but is closer to the threshold for the large bowel (6 cm). **High-Yield Clinical Pearls for NEET-PG:** * **Step-ladder pattern:** Characteristic of small bowel obstruction due to multiple fluid levels. * **String of beads sign:** Small bubbles of gas trapped between valvulae conniventes in a fluid-filled small bowel. * **Coffee bean sign:** Classic for sigmoid volvulus (large bowel). * **Rigler’s sign:** Seeing both sides of the bowel wall, indicating pneumoperitoneum.

Q: Which of the following is NOT true regarding a renal pseudotumor?

Frequently requires surgical intervention. ### Explanation **Renal pseudotumors** are anatomical variants of normal renal parenchyma that mimic a neoplasm on imaging. Understanding these is crucial to avoid unnecessary invasive procedures. **1. Why Option A is the correct answer:** Renal pseudotumors are **benign anatomical variants**, not true pathologies. They consist of normal, healthy renal tissue (cortex and glomeruli). Therefore, they **do not require surgical intervention** or biopsy. Management is purely conservative, usually involving confirmation via Doppler US, CT, or nuclear medicine (DMSA scan) to rule out a true malignancy. **2. Analysis of Incorrect Options:** * **Option B (Hypertrophied Column of Bertin):** This is the most common type of pseudotumor. It occurs when cortical tissue indents the renal sinus, often appearing as a "mass" between the upper and middle poles. * **Option C (Dromedary Hump):** This is a focal bulge on the lateral border of the left kidney caused by the splenic impression during development. It is a classic example of a pseudotumor. * **Option D (No clinical significance):** Since these are normal variants, they do not cause symptoms, hematuria, or functional impairment. Their only "significance" is the potential for being misdiagnosed as a renal cell carcinoma (RCC). **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** A **Technetium-99m DMSA scan** is the most definitive way to differentiate a pseudotumor from a tumor. A pseudotumor will show **normal or increased uptake** (as it contains functioning nephrons), whereas a true tumor will appear as a "cold" spot. * **Imaging Clue:** On CT, a pseudotumor shows the **same enhancement pattern** as the rest of the renal cortex in all phases. * **Common Sites:** Columns of Bertin are typically found at the junction of the upper and middle thirds of the kidney.

Q: 'Thumb print' appearance on Barium enema is found in:

Bowel ischemia. **Explanation:** The **'Thumbprint' appearance** (or thumbprinting) is a classic radiologic sign seen on a Barium enema or plain abdominal X-ray. It represents **focal submucosal edema and hemorrhage** caused by an acute insult to the bowel wall, most commonly **Ischemic Colitis**. When the bowel wall becomes congested, the thickened folds protrude into the air or contrast-filled lumen, creating indentations that resemble the impression of a thumb. **Analysis of Options:** * **Bowel Ischemia (Correct):** This is the most common cause. The submucosal hemorrhage creates the characteristic scalloped appearance of the colonic wall. It is typically seen in the "watershed" areas like the splenic flexure (Griffith’s point). * **Volvulus:** Characterized by a **'Coffee bean' sign** (sigmoid volvulus) or a **'Bird’s beak' appearance** on a barium enema at the site of the twist. * **Gastric Ulcer:** Typically evaluated via endoscopy or upper GI series. Signs include an **ulcer crater** or **Hampton’s line**, but not thumbprinting, which is a colonic sign. * **Intussusception:** Classically presents with a **'Coiled spring' appearance** or **'Cup-shaped' defect** on a barium enema as the contrast trickles between the intussusceptum and intussuscipiens. **High-Yield Clinical Pearls for NEET-PG:** * **Other causes of thumbprinting:** Ulcerative Colitis (acute flare), Crohn’s disease, and submucosal lymphoma. * **Ischemic Colitis vs. Mesenteric Ischemia:** Thumbprinting is more specific to Ischemic Colitis (mucosal/submucosal injury) rather than acute mesenteric ischemia (which often shows a normal X-ray initially). * **Lead pipe appearance:** Seen in chronic Ulcerative Colitis due to loss of haustrations.

Q: What is the initial imaging modality of choice for suspected pyonephrosis?

Ultrasound (USG). **Explanation:** **Pyonephrosis** is a surgical emergency characterized by the presence of infected, purulent material (pus) within an obstructed collecting system. Prompt diagnosis is critical to prevent urosepsis and permanent renal damage. **Why Ultrasound (USG) is the correct answer:** Ultrasound is the **initial imaging modality of choice** because it is rapid, non-invasive, bedside-compatible, and highly sensitive (up to 90%) for detecting both hydronephrosis and the presence of debris. The classic sonographic hallmark of pyonephrosis is the presence of **low-level internal echoes (layering debris)** within a dilated collecting system. It also allows for immediate therapeutic intervention via ultrasound-guided percutaneous nephrostomy (PCN). **Why other options are incorrect:** * **Contrast-enhanced CT (CECT):** While CT is more sensitive for identifying the *cause* of obstruction (e.g., stones) and assessing the renal parenchyma, it is generally considered the second-line or confirmatory investigation. The use of IV contrast may also be risky in patients with potential renal impairment due to obstruction. * **Intravenous Pyelogram (IVP):** This is largely obsolete in acute settings. In pyonephrosis, the affected kidney often shows "delayed or absent excretion," providing little diagnostic information regarding the nature of the fluid. * **MRI:** Though sensitive, MRI is time-consuming, expensive, and not practical for an emergency diagnosis. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of Pyonephrosis:** Fever, flank pain, and hydronephrosis. * **Gold Standard for Diagnosis:** Aspiration of pus from the collecting system (usually during PCN). * **Key USG Finding:** Persistent low-level echoes in the dependent portion of the dilated calyces (fluid-debris level). * **Management:** Emergency drainage (PCN or retrograde stenting) is mandatory; antibiotics alone are insufficient.

Question 1

Snow storm ascites is seen in which of the following conditions?

Accepted Answer

Meconium ileus

Answer

Hirschsprung disease

Answer

Ileocaecal tuberculosis

Answer

Pseudomyxoma peritonei

Question 2

What is the investigation of choice to visualize the gallbladder?

Accepted Answer

Ultrasound (USG)

Answer

CT scan

Answer

Plain X-ray

Answer

Oral cholecystogram

Question 3

In the suppurative phase, a pyogenic liver abscess will appear as what on ultrasound?

Accepted Answer

Hyperechoic

Answer

Hypoechoic

Answer

Isoechoic

Answer

Cystic

Question 4

What is a typical ultrasound finding in chronic renal disease?

Accepted Answer

All of the above

Answer

Enlarged kidney

Answer

Normal kidney

Answer

Shrunken kidney

Question 5

Which of the following is not a feature of renovascular hypertension on IVU?

Accepted Answer

Filling defect in calyces

Answer

Delayed wash out of contrast

Answer

Ureteral kinking

Answer

Normal or small sized kidney

Question 6

A plain X-ray abdomen is performed in a case of small bowel obstruction. Small bowel is considered dilated if its diameter is more than:

Accepted Answer

3 cm

Answer

2 cm

Answer

4 cm

Answer

5 cm

Question 7

Which of the following is NOT true regarding a renal pseudotumor?

Accepted Answer

Frequently requires surgical intervention

Answer

Represents hypertrophied column of Bertin

Answer

Can be visualized as a dromedary hump

Answer

Has no clinical significance

Question 8

'Thumb print' appearance on Barium enema is found in:

Accepted Answer

Bowel ischemia

Answer

Volvulus

Answer

Gastric ulcer

Answer

Intussusception

Question 9

What is the initial imaging modality of choice for suspected pyonephrosis?

Accepted Answer

Ultrasound (USG)

Answer

Contrast-enhanced CT (CECT)

Answer

Intravenous pyelogram (IVP)

Answer

Magnetic Resonance Imaging (MRI)

Question 10

Which of the following is NOT a cause of pneumoperitoneum?

Accepted Answer

Laparoscopy

Answer

Subdiaphragmatic fat

Answer

Chilaiditi syndrome

Answer

Subphrenic abscess

Abdominal and Pelvic Radiology — MCQs

Abdominal and Pelvic Radiology — MCQs

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