Abdominal and Pelvic Radiology Practice Questions

Q: Radiography of which of the following renal stones shows opacity, EXCEPT?

Uric acid. **Explanation:** The visibility of renal stones on a plain X-ray (KUB) depends on their **atomic number** and **density** relative to surrounding tissues. Stones containing calcium are radiopaque, while those lacking heavy elements are radiolucent. **Why Uric Acid is the Correct Answer:** Uric acid stones are composed of organic compounds with low atomic numbers. They do not contain calcium or other heavy minerals, making them **radiolucent** on conventional radiography. They are typically visualized using Ultrasound or Non-Contrast Computed Tomography (NCCT), where they appear hyperdense. **Analysis of Incorrect Options:** * **Oxalate (Calcium Oxalate):** These are the most common renal stones. Due to their high calcium content, they are **highly radiopaque** and easily seen on X-ray. * **Cystine:** These stones contain sulfur atoms. While they are less dense than calcium stones, they are **faintly radiopaque** (often described as having a "ground-glass" appearance). * **Struvite (Triple Phosphate):** Composed of Magnesium Ammonium Phosphate, these often form "staghorn" calculi. They contain enough mineral content to be **radiopaque**, though usually less so than pure calcium oxalate. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic for Radiolucent Stones (SULI):** **S**ulfonamides, **U**ric acid, **L**euvonir/Indinavir (HIV drugs), **I**ndinavir. * **Gold Standard Investigation:** Non-Contrast CT (NCCT) is the investigation of choice for all renal stones as it can detect almost all types, including radiolucent uric acid stones (except Indinavir stones). * **Pure Matrix stones** are also radiolucent. * **Cystine stones** are unique for being hexagonal on microscopy and faintly opaque on X-ray.

Q: A 26-year-old male presents with abdominal pain and episodes of hematuria. His blood pressure is 160/100 mm Hg and is refractory to standard antihypertensive drugs. Renal Doppler shows a parvus tardus pattern. Subsequent CT renal angiogram was performed. This condition, as depicted, may occur in all of the following except?

Polyarteritis nodosa (PAN). ***Polyarteritis nodosa (PAN)*** - **PAN** typically causes **microaneurysms** and **necrotizing vasculitis** in medium-sized arteries, not stenotic lesions that would produce **parvus tardus** waveforms. - The **parvus tardus pattern** indicates **proximal renal artery stenosis**, which is not characteristic of PAN's pathophysiology involving aneurysmal dilatation rather than narrowing. *Atherosclerosis* - **Atherosclerotic plaques** commonly cause **renal artery stenosis**, especially at the **ostium**, leading to renovascular hypertension and **parvus tardus** waveforms. - This is the most common cause of **renal artery stenosis** in patients over 50 years, though can occur in younger patients with risk factors. *Fibromuscular dysplasia (FMD)* - **FMD** is a leading cause of **renal artery stenosis** in young adults, particularly women, causing the classic **"string of beads"** appearance on angiography. - The **medial fibroplasia** variant creates alternating areas of stenosis and dilatation, resulting in **parvus tardus** waveforms downstream from the stenotic segments. *Takayasu arteritis* - This **large vessel vasculitis** commonly involves the **renal arteries**, causing stenosis through inflammatory wall thickening and fibrosis. - **Takayasu arteritis** can present with **renovascular hypertension** and **parvus tardus** patterns, particularly in young Asian women with systemic inflammatory symptoms.

Q: Which of the following is NOT a feature of ischemic colitis?

Dilution of barium. **Explanation:** Ischemic colitis occurs due to a sudden reduction in blood flow to the colon, most commonly at "watershed areas" like the splenic flexure (Griffith’s point). **Why "Dilution of Barium" is the correct answer:** Dilution of barium is a characteristic radiological feature of **Malabsorption syndromes** (like Celiac disease) or **Small Bowel Obstruction**, where excessive intraluminal fluid mixes with the contrast. It is not a feature of ischemic colitis, which primarily involves mural changes rather than hypersecretion or fluid accumulation. **Analysis of Incorrect Options:** * **Thumb printing (Option A):** This is the **most characteristic** early sign of ischemic colitis on a barium enema or CT. It represents localized submucosal hemorrhage and edema, appearing as rounded indentations on the bowel lumen. * **Increased mucosal fold thickness (Option C):** Ischemia leads to inflammatory edema and congestion of the bowel wall, resulting in thickened, blunted, or distorted mucosal folds. * **Serrated mucosa (Option B):** As ischemia progresses, superficial mucosal ulcerations occur. When barium fills these small ulcers, it gives the bowel margin a "serrated" or "saw-tooth" appearance. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Splenic flexure (Griffith’s point) followed by the rectosigmoid junction (Sudeck’s point). * **Gold Standard Diagnosis:** Colonoscopy (shows pale mucosa, petechiae, or "Single Stripe Sign"). * **Imaging:** CT shows "Target Sign" (concentric wall thickening). * **Clinical Presentation:** Sudden onset left-sided abdominal pain followed by bloody diarrhea in an elderly patient with cardiovascular risk factors.

Q: The most appropriate investigation for diagnosing the condition shown in the X-ray is:

Barium meal. ***Barium meal*** - **Barium meal** is the gold standard for diagnosing and classifying **hiatus hernia**, clearly demonstrating the **gastroesophageal junction** position and **stomach herniation** into the thoracic cavity. - It can differentiate between **sliding hiatus hernia** (Type I) and **rolling/paraesophageal hernia** (Type II-IV), which is crucial for management planning. *Computer tomography (CT) scan* - While CT can identify hiatus hernia, it's **not the first-line investigation** and is more expensive with **radiation exposure**. - CT is typically reserved for **complications** like **strangulation** or when **surgical planning** is required. *Chest x-ray* - Though chest X-ray may show the **retrocardiac gas shadow** suggesting hiatus hernia, it's only a **screening tool** and cannot provide definitive diagnosis. - It lacks the **anatomical detail** needed to classify the type of hernia or assess the **gastroesophageal junction** adequately. *Upper GI endoscopy* - Endoscopy is primarily used to assess **mucosal abnormalities** and **complications** like **esophagitis** or **Barrett's esophagus**. - It cannot adequately visualize the **anatomical relationships** and **hernial sac** position that are essential for hiatus hernia diagnosis.

Q: Confluent areas of pancreatic parenchyma that do not demonstrate enhancement after the administration of intravenous contrast material are known as?

Pancreatic necrosis. **Explanation:** The core concept in this question is the assessment of pancreatic viability using Contrast-Enhanced Computed Tomography (CECT). **1. Why Pancreatic Necrosis is Correct:** According to the **Revised Atlanta Classification**, pancreatic necrosis is defined as diffuse or focal areas of non-enhancing pancreatic parenchyma. In a normal CECT, the pancreas enhances brightly due to its rich blood supply. The absence of enhancement (typically 4 weeks after *interstitial edematous pancreatitis*. Crucially, it contains no solid/necrotic components. * **Walled-off Pancreatic Necrosis (B):** While WON involves necrosis, it refers specifically to a mature, encapsulated collection of pancreatic/peripancreatic necrosis that has developed a thick inflammatory wall (usually >4 weeks after onset). The question asks for the parenchymal finding itself, not the late-stage encapsulated collection. * **Acute Peripancreatic Fluid Collection (C):** This occurs within the first 4 weeks of *edematous* pancreatitis. It is limited to the peripancreatic spaces and does not involve parenchymal necrosis. **Clinical Pearls for NEET-PG:** * **Gold Standard Imaging:** CECT is the modality of choice for diagnosing and grading the severity of acute pancreatitis. * **Timing:** CECT performed too early (<48 hours) may underestimate the extent of necrosis. * **Balthazar Score:** Used to grade the severity of pancreatitis based on CT findings. * **Infected Necrosis:** Suggested by the presence of **extraluminal gas** within the necrotic area on CT.

Q: Which of the following is most likely to cause the given cystogram appearance?

Neurogenic bladder. ***Neurogenic bladder*** - Produces the classic **'pine-tree' or 'Christmas tree'** cystogram appearance with **trabeculation**, **diverticula**, and **irregular bladder outline** due to detrusor muscle dysfunction. - Results from **neurological disorders** affecting bladder innervation, leading to **bladder wall hypertrophy** and characteristic radiological features. *Congenital anomalies of the genitourinary tract* - Typically show **structural malformations** like **duplex systems**, **ureteroceles**, or **bladder exstrophy** rather than trabeculation. - Cystogram findings are usually **smooth-walled** with anatomical variations, not the irregular trabeculated pattern. *Tuberculosis* - Characteristically causes **'thimble bladder'** appearance with **small capacity** and **smooth, contracted walls**. - Results in **bladder fibrosis** and **strictures**, producing a small, rigid bladder rather than trabeculation and diverticula. *Schistosomiasis* - Primarily causes **bladder wall calcification** visible as **rim-like calcification** on plain radiographs. - Chronic infection leads to **bladder wall thickening** and **calcification**, not the trabeculated pine-tree appearance.

Q: Which of the following is NOT a feature suggestive of acute cholecystitis on CT abdomen?

Contracted gallbladder. **Explanation:** Acute cholecystitis is an inflammatory condition typically caused by cystic duct obstruction. On imaging, the hallmark of acute inflammation is **gallbladder distension** (transverse diameter >4 cm) rather than contraction. **1. Why "Contracted gallbladder" is the correct answer:** A **contracted gallbladder** is a feature of chronic cholecystitis or a post-prandial state. In acute cholecystitis, the gallbladder is almost always **distended** due to the accumulation of mucus and inflammatory exudate behind an obstructed duct (hydrops). **2. Analysis of incorrect options:** * **Pericholecystic fluid (Option A):** This is a specific sign of inflammation or localized perforation and is a classic CT finding in acute cholecystitis. * **Presence of gallstones (Option B):** While CT is not the gold standard for stones (Ultrasound is better), the presence of a stone lodged in the gallbladder neck is the primary inciting factor in 90-95% of cases (calculous cholecystitis). * **Air in the gallbladder wall (Option D):** This signifies **Emphysematous Cholecystitis**, a surgical emergency and a severe variant of acute cholecystitis caused by gas-forming organisms (e.g., *Clostridium perfringens*), common in diabetic patients. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Radionuclide scan (**HIDA scan**)—failure to visualize the gallbladder confirms cystic duct obstruction. * **Investigation of Choice (Initial):** **Ultrasound**, showing wall thickening (>3mm), distension, and a **Positive Sonographic Murphy’s Sign**. * **CT Findings:** Wall thickening, pericholecystic fat stranding, and "rim enhancement" of the gallbladder wall.

Q: What is the characteristic finding of a "saw tooth appearance" in an abdominal barium enema X-ray?

Prediverticulosis. ### Explanation **Correct Option: B. Prediverticulosis** The "saw tooth appearance" is a classic radiological sign of **prediverticulosis** (the early stage of diverticular disease). This appearance is caused by **circular muscle hypertrophy** and thickening of the *taeniae coli* in the sigmoid colon. This muscular thickening results in a narrowed lumen and a series of sharp, serrated indentations along the bowel wall on a barium enema, resembling the teeth of a saw. It represents the spastic phase before the actual herniation of mucosa (diverticula) occurs. **Analysis of Incorrect Options:** * **A. Multiple polyposis:** Characterized by multiple small, rounded **filling defects** within the barium column, often described as a "carpet of polyps." * **C. Ischemic colitis:** Typically presents with **"thumbprinting"** (indentations caused by submucosal edema/hemorrhage), usually at the splenic flexure or Griffith’s point. * **D. Ulcerative colitis:** Early stages show fine mucosal granularity; chronic stages show loss of haustrations, leading to a smooth, rigid **"lead pipe"** appearance. **High-Yield Clinical Pearls for NEET-PG:** * **Diverticulosis:** The most common site is the **sigmoid colon**. The gold standard for diagnosing *acute diverticulitis* is a **Contrast-Enhanced CT (CECT)**, not a barium enema (due to perforation risk). * **Lead Pipe Appearance:** Chronic Ulcerative Colitis. * **Cobblestone Appearance/String Sign of Kantor:** Crohn’s Disease. * **Apple Core Appearance:** Colorectal Carcinoma (specifically annular lesions). * **Bird’s Beak Appearance:** Achalasia Cardia (on barium swallow) or Sigmoid Volvulus (on barium enema).

Q: CT findings in gastric volvulus typically include which of the following?

An enlarged, twisted stomach. **Explanation:** **Gastric volvulus** is a surgical emergency characterized by the rotation of the stomach (more than 180°) around its longitudinal or transverse axis, leading to obstruction and potential ischemia. 1. **Why Option B is correct:** In gastric volvulus, the stomach becomes **enlarged** because the rotation creates a closed-loop or high-grade obstruction. This prevents the passage of gastric contents and swallowed air into the duodenum, while the proximal esophagus may also be obstructed. Consequently, the stomach becomes massively distended with fluid and gas. CT imaging typically reveals a dilated stomach in an abnormal position, often with two separate air-fluid levels and a "whirl sign" representing the twisted mesentery. 2. **Why other options are incorrect:** * **Option A & C:** A small or normally sized stomach is inconsistent with a volvulus. The hallmark of the condition is the mechanical obstruction; without distension (enlargement), the diagnosis of a clinically significant volvulus is unlikely. **High-Yield Clinical Pearls for NEET-PG:** * **Borchardt’s Triad:** The classic clinical presentation includes: 1. Sudden epigastric pain/distension, 2. Violent unproductive retching (inability to vomit), and 3. Inability to pass a nasogastric tube. * **Types:** * **Organo-axial (Most common):** Rotation around the long axis (connecting cardia and pylorus). Often associated with paraesophageal hernias. * **Mesentero-axial:** Rotation around the short axis (connecting lesser and greater curvatures). More common in children and associated with wandering spleen. * **Imaging Gold Standard:** While CT is excellent for complications, a **Barium Swallow** is often used to confirm the anatomy of the twist. * **Complication:** Ischemia can lead to gastric necrosis and perforation (high mortality).

Question 1

Radiography of which of the following renal stones shows opacity, EXCEPT?

Accepted Answer

Uric acid

Answer

Oxalate

Answer

Cystine

Answer

Struvite

Question 2

A 26-year-old male presents with abdominal pain and episodes of hematuria. His blood pressure is 160/100 mm Hg and is refractory to standard antihypertensive drugs. Renal Doppler shows a parvus tardus pattern. Subsequent CT renal angiogram was performed. This condition, as depicted, may occur in all of the following except?

Accepted Answer

Polyarteritis nodosa (PAN)

Answer

Atherosclerosis

Answer

Fibromuscular dysplasia (FMD)

Answer

Takayasu arteritis

Question 3

Which of the following is NOT a feature of ischemic colitis?

Accepted Answer

Dilution of barium

Answer

Thumb printing

Answer

Serrated mucosa

Answer

Increased mucosal fold thickness

Question 4

The most appropriate investigation for diagnosing the condition shown in the X-ray is:

Accepted Answer

Barium meal

Answer

Computer tomography (CT) scan

Answer

Chest x-ray

Answer

Upper GI endoscopy

Question 5

Confluent areas of pancreatic parenchyma that do not demonstrate enhancement after the administration of intravenous contrast material are known as?

Accepted Answer

Pancreatic necrosis

Answer

Pseudocyst

Answer

Walled-off pancreatic necrosis

Answer

Acute peripancreatic fluid collection

Question 6

Which of the following is most likely to cause the given cystogram appearance?

Accepted Answer

Neurogenic bladder

Answer

Congenital anomalies of the genitourinary tract

Answer

Tuberculosis

Answer

Schistosomiasis

Question 7

Which of the following is NOT a feature suggestive of acute cholecystitis on CT abdomen?

Accepted Answer

Contracted gallbladder

Answer

Pericholecystic fluid

Answer

Presence of gallstones

Answer

Air in the gallbladder wall

Question 8

A large volume of gas is seen at the subdiaphragmatic level on an X-ray. What is the most likely diagnosis?

Accepted Answer

Peritoneal perforation

Answer

Intestinal obstruction

Answer

Paralytic ileus

Answer

Intussusception

Question 9

What is the characteristic finding of a "saw tooth appearance" in an abdominal barium enema X-ray?

Accepted Answer

Prediverticulosis

Answer

Multiple polyposis

Answer

Ischemic colitis

Answer

Ulcerative colitis

Question 10

CT findings in gastric volvulus typically include which of the following?

Accepted Answer

An enlarged, twisted stomach

Answer

A small, twisted stomach

Answer

A normally sized, twisted stomach

Answer

None of the above

Abdominal and Pelvic Radiology — MCQs

Abdominal and Pelvic Radiology — MCQs

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