Abdominal and Pelvic Radiology — MCQs
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Which of the following represents the best method in diagnosing medullary cystic disease of the kidney?
Thickened gastric folds are found in which of the following conditions?
A "rat-tail" appearance on barium swallow examination is seen in which of the following conditions?
The "collar button" sign is associated with which condition?
Which of the following conditions is characterized by a trifoliate appearance?
A 56-year-old male presents with burning micturition, increasing frequency, and hesitancy. An intravenous pyelogram was performed, and the radiograph is shown. What is the most likely diagnosis?
Functional analysis of the kidney is best evaluated by which imaging modality?
Which of the following is NOT a typical ultrasound finding of Autosomal Recessive Polycystic Kidney Disease (ARPKD)?
The "Bouquet of Flowers" appearance is classically seen in which of the following conditions?
An X-ray of the abdomen shows multiple fluid levels. What is the most likely diagnosis?
Abdominal and Pelvic Radiology Indian Medical PG Practice Questions and MCQs
Question 371: Which of the following represents the best method in diagnosing medullary cystic disease of the kidney?
- A. Ultrasound
- B. Nuclear scan
- C. Urography
- D. Biopsy (Correct Answer)
Explanation: **Explanation:** **Medullary Cystic Kidney Disease (MCKD)**, now often classified under Autosomal Dominant Tubulointerstitial Kidney Disease (ADTKD), is a genetic condition characterized by tubulointerstitial fibrosis, tubular atrophy, and the formation of cysts specifically at the corticomedullary junction. 1. **Why Biopsy is the Correct Answer:** The definitive diagnosis of MCKD relies on **histopathology**. While imaging may suggest the disease, a renal biopsy is the "gold standard" because it demonstrates the pathognomonic features: thickened tubular basement membranes, interstitial fibrosis, and chronic inflammatory infiltrates. Since the cysts are often microscopic (ranging from 1mm to 1cm) and located deep within the medulla, they are frequently missed by non-invasive imaging, making tissue diagnosis essential for confirmation. 2. **Why Other Options are Incorrect:** * **Ultrasound:** While it can show small, shrunken kidneys or increased echogenicity, it often fails to visualize the small medullary cysts. It is used for screening but is not diagnostic. * **Nuclear Scan:** This assesses renal perfusion and functional excretion (e.g., DTPA/MAG3) but lacks the anatomical resolution to identify specific medullary cystic changes. * **Urography (IVP):** This is largely obsolete for this condition. It may show "stretching" of calyces in advanced cases, but it cannot differentiate MCKD from other causes of chronic interstitial nephritis. **NEET-PG High-Yield Pearls:** * **Clinical Presentation:** Patients typically present in adulthood with polyuria, polydipsia, and salt-wasting, leading to progressive renal failure. * **Imaging Hallmark:** Small, shrunken kidneys with cysts at the **corticomedullary junction** (unlike Polycystic Kidney Disease where kidneys are enlarged). * **Differential Diagnosis:** Must be distinguished from **Medullary Sponge Kidney**, which is usually asymptomatic, presents with nephrocalcinosis, and shows a "bouquet of flowers" appearance on IVP.
Question 372: Thickened gastric folds are found in which of the following conditions?
- A. Lymphoma
- B. Menetrier's disease
- C. Carcinoma
- D. All of the above (Correct Answer)
Explanation: Thickened gastric folds (hypertrophic gastropathy) are a significant radiological and endoscopic finding characterized by rugae exceeding 5 mm in width. This appearance results from infiltration of the gastric wall by inflammatory cells, malignant cells, or excessive mucosal proliferation. **Explanation of Options:** * **Lymphoma (Option A):** Gastric lymphoma (most commonly MALToma or DLBCL) typically presents with massive, irregular, and "soft" fold thickening. Unlike adenocarcinoma, lymphoma often preserves gastric pliability and distensibility despite extensive infiltration. * **Menetrier’s Disease (Option B):** This is a protein-losing gastropathy characterized by massive hyperplasia of surface mucous cells and atrophy of parietal cells. It classically involves the **fundus and body**, sparing the antrum, and presents with "giant" folds resembling cerebral convolutions. * **Carcinoma (Option C):** Specifically, **Linitis Plastica** (diffuse-type adenocarcinoma) causes significant wall thickening and fold distortion. In these cases, the stomach becomes rigid and non-distensible (the "leather bottle" appearance). **Why "All of the Above" is Correct:** All three conditions involve pathological processes—neoplastic infiltration (Lymphoma/Carcinoma) or mucosal hyperplasia (Menetrier’s)—that increase the volume of the gastric wall layers, leading to the radiological appearance of thickened folds. **NEET-PG High-Yield Pearls:** * **Zollinger-Ellison Syndrome:** Another classic cause of thickened folds due to hypergastrinemia-induced parietal cell hyperplasia. * **Menetrier’s Disease Triad:** Giant gastric folds + Hypoalbuminemia (protein loss) + Achlorhydria. * **Imaging Modality:** While Barium swallow shows "filling defects" or "cobblestone" patterns, **CT scan** is the preferred modality to assess wall thickness and extragastric extension.
Question 373: A "rat-tail" appearance on barium swallow examination is seen in which of the following conditions?
- A. Achalasia cardia
- B. Carcinoma esophagus (Correct Answer)
- C. Hiatus hernia
- D. Diffuse esophageal spasm
Explanation: ### Explanation The **"rat-tail" appearance** (also known as the "bird-beak" or "apple-core" appearance in different contexts) on a barium swallow refers to a short, irregular, and eccentric narrowing of the distal esophagus. **1. Why Carcinoma Esophagus is correct:** In esophageal malignancy, the tumor causes asymmetric, transmural infiltration of the esophageal wall. This leads to an **abrupt, irregular narrowing** with "shouldering" of the margins, creating a ragged, tapered look resembling a rat’s tail. This reflects the destructive and stenotic nature of the growth. **2. Analysis of Incorrect Options:** * **Achalasia Cardia:** This condition typically shows a **"bird-beak"** or **"mouse-tail"** appearance. Unlike the rat-tail of cancer, the narrowing in achalasia is **smooth, symmetric, and persistent**, representing a failure of the lower esophageal sphincter (LES) to relax. * **Hiatus Hernia:** This is characterized by the protrusion of the stomach through the diaphragmatic hiatus. On barium swallow, it appears as a bulbous sac above the diaphragm with the presence of gastric folds (Schatzki ring may also be seen). * **Diffuse Esophageal Spasm (DES):** This presents with a **"corkscrew esophagus"** or **"rosary bead"** appearance due to simultaneous, non-peristaltic tertiary contractions. **3. NEET-PG High-Yield Pearls:** * **Bird-beak/Mouse-tail:** Achalasia Cardia (Smooth tapering). * **Rat-tail/Apple-core:** Carcinoma Esophagus (Irregular tapering). * **Corkscrew/Rosary bead:** Diffuse Esophageal Spasm. * **Shaggy/Moth-eaten:** Candida Esophagitis. * **Multiple small ulcers (Halo sign):** Herpes Esophagitis. * **Stepladder appearance:** Corrosive injury (strictures).
Question 374: The "collar button" sign is associated with which condition?
- A. Ulcerative colitis (Correct Answer)
- B. Hirschsprung disease
- C. Plummer-Vinson syndrome
- D. Chilaiditi syndrome
Explanation: The **"collar button" sign** is a classic radiological finding in **Ulcerative Colitis (UC)**, typically seen on a double-contrast barium enema. ### 1. Why Ulcerative Colitis is Correct In the acute phase of UC, inflammation leads to the formation of deep, penetrating ulcers. These ulcers extend through the mucosa and undermine the submucosa. On a barium study, the contrast fills these ulcers, appearing as a narrow neck (at the mucosal level) that expands into a wider base (in the submucosa). This shape resembles a traditional shirt collar button or a "T-shaped" projection. ### 2. Why Other Options are Incorrect * **Hirschsprung disease:** Characterized by a "transition zone" on barium enema, where a narrow aganglionic distal segment leads to a dilated proximal colon (megacolon). * **Plummer-Vinson syndrome:** Associated with esophageal webs, iron deficiency anemia, and dysphagia. On imaging, it shows a thin, horizontal shelf-like projection in the upper esophagus. * **Chilaiditi syndrome:** A radiological curiosity where a loop of colon (usually the hepatic flexure) is interposed between the liver and the diaphragm, mimicking pneumoperitoneum. ### 3. NEET-PG High-Yield Pearls * **Lead Pipe Colon:** Seen in chronic UC due to loss of haustrations and bowel shortening. * **Pseudopolyps:** Islands of regenerating mucosa surrounded by areas of ulceration. * **Thumbprinting:** Seen in ischemic colitis (due to submucosal edema/hemorrhage). * **String Sign of Kantor:** Associated with Crohn’s disease (terminal ileum narrowing). * **Cobblestone Appearance:** Classic for Crohn’s disease due to longitudinal and transverse ulcers.
Question 375: Which of the following conditions is characterized by a trifoliate appearance?
- A. Peptic ulcer (Correct Answer)
- B. Pyloric stenosis
- C. Carcinoma head of pancreas
- D. None of the above
Explanation: The **trifoliate appearance** (also known as the **cloverleaf deformity**) is a classic radiological sign seen on a Barium meal study in patients with a chronic **duodenal ulcer** (a type of peptic ulcer). ### Why Peptic Ulcer is Correct: When a chronic ulcer occurs in the duodenal bulb, it undergoes repeated cycles of healing and scarring. This leads to: 1. **Central Crater:** The active ulcer niche. 2. **Pseudodiverticula:** The surrounding duodenal wall puckers and outpouches due to cicatricial (scar) contraction. The combination of the central ulcer niche and the symmetrical outpouchings of the bulb creates a shape resembling a three-leaf clover or a "trifoliate" pattern. ### Why Other Options are Incorrect: * **Pyloric Stenosis:** Typically presents with the **"String sign"** (narrowed pyloric canal), **"Beak sign,"** or **"Mushroom sign"** on Barium studies. It does not produce a cloverleaf shape. * **Carcinoma Head of Pancreas:** Classically associated with the **"Frostberg’s inverted 3 sign"** on Barium swallow/meal, caused by the tumor indenting the medial wall of the duodenum. ### High-Yield Clinical Pearls for NEET-PG: * **Cloverleaf Deformity:** Chronic Duodenal Ulcer (specifically the bulb). * **Frostberg’s Sign:** Carcinoma Head of Pancreas. * **Double Bubble Sign:** Duodenal Atresia (X-ray). * **Single Bubble Sign:** Pyloric Stenosis (X-ray). * **Coffee Bean Sign:** Sigmoid Volvulus. * **Bird’s Beak Appearance:** Achalasia Cardia (Barium Swallow).
Question 376: A 56-year-old male presents with burning micturition, increasing frequency, and hesitancy. An intravenous pyelogram was performed, and the radiograph is shown. What is the most likely diagnosis?
- A. Multicystic dysplastic kidney disease
- B. Aortic aneurysm
- C. Renal cell carcinoma
- D. Pelvic lipomatosis (Correct Answer)
Explanation: ***Pelvic lipomatosis*** - Presents with **pear-shaped bladder** and **radiolucent halo** around the bladder on IVP, caused by excess **fatty tissue** in the pelvis compressing the bladder - Commonly affects **middle-aged males** causing **lower urinary tract symptoms** (LUTS) including burning micturition, frequency, and hesitancy due to bladder compression *Multicystic dysplastic kidney disease* - A **congenital condition** typically diagnosed in **infancy or childhood**, not in a 56-year-old male - Shows **multiple non-communicating cysts** replacing normal renal parenchyma on imaging, not the pear-shaped bladder deformity seen here *Aortic aneurysm* - Would present with **pulsatile abdominal mass** and potential **back pain**, not primarily urinary symptoms - IVP would show **lateral displacement** of ureters or kidneys, not the characteristic bladder changes described *Renal cell carcinoma* - Typically presents with **hematuria**, **flank pain**, and **palpable mass** (classic triad), not lower urinary tract symptoms - IVP would show **renal mass effect** or **calyceal distortion**, not the pear-shaped bladder configuration
Question 377: Functional analysis of the kidney is best evaluated by which imaging modality?
- A. Radionuclide scanning (Correct Answer)
- B. Intravenous pyelography (IVP)
- C. Ultrasound
- D. Magnetic Resonance Imaging (MRI)
Explanation: **Explanation:** The gold standard for the functional evaluation of the kidneys is **Radionuclide scanning (Nuclear Medicine)**. Unlike anatomical imaging, nuclear scans utilize radiopharmaceuticals (like DTPA, MAG3, or DMSA) that are handled by the kidneys through specific physiological processes—glomerular filtration or tubular secretion. By measuring the rate of uptake and excretion of these tracers over time, clinicians can calculate the **Split Renal Function (SRF)** and the **Glomerular Filtration Rate (GFR)** with high precision. **Analysis of Options:** * **Intravenous Pyelography (IVP):** While IVP provides a "rough" estimate of function (visualizing contrast excretion), it is primarily used for anatomical assessment of the collecting system. It is qualitative rather than quantitative and is largely replaced by CT Urography. * **Ultrasound:** This is the initial screening modality for renal size, cortical thickness, and hydronephrosis. It provides excellent **anatomical** detail but offers no direct information regarding renal function or GFR. * **MRI:** MR Urography can assess function (Dynamic Contrast-Enhanced MRI), but it is expensive, not widely available for routine functional assessment, and carries the risk of Nephrogenic Systemic Fibrosis (NSF) in patients with pre-existing renal failure. **High-Yield Clinical Pearls for NEET-PG:** * **99mTc-DTPA:** Best for evaluating **GFR** (filtered by the glomerulus). * **99mTc-MAG3:** Best for evaluating renal function in patients with **renal failure** (secreted by tubules). * **99mTc-DMSA:** The gold standard for detecting **renal scarring** and cortical morphology (it binds to the proximal tubules and stays in the cortex). * **Diuretic Renogram (Lasix Scan):** Used to differentiate between obstructive and non-obstructive hydronephrosis.
Question 378: Which of the following is NOT a typical ultrasound finding of Autosomal Recessive Polycystic Kidney Disease (ARPKD)?
- A. Retention of reniform shape of kidneys
- B. Oligohydramnios
- C. Loss of corticomedullary differentiation
- D. Cysts greater than 3 cm in diameter (Correct Answer)
Explanation: **Explanation:** **Autosomal Recessive Polycystic Kidney Disease (ARPKD)** is a genetic disorder characterized by the non-obstructive ectasia (dilation) of the renal collecting ducts. **Why Option D is the Correct Answer:** In ARPKD, the cysts are microscopic (usually <2 mm) because they represent dilated collecting ducts. On ultrasound, these myriad tiny interfaces reflect the sound beam, making the kidneys appear **diffusely hyperechoic and enlarged**. Large, discrete cysts (>3 cm) are characteristic of **Autosomal Dominant Polycystic Kidney Disease (ADPKD)** or simple renal cysts, but are not a feature of the infantile/neonatal presentation of ARPKD. **Analysis of Incorrect Options:** * **Option A:** Despite massive enlargement, the kidneys typically **retain their reniform (kidney-like) shape** because the dilation is uniform across the collecting system. * **Option B:** Since the kidneys are dysfunctional in utero, there is decreased fetal urine production, leading to **oligohydramnios**, which can result in Potter sequence (pulmonary hypoplasia, clubbed feet, and flattened facies). * **Option C:** The diffuse involvement of the collecting ducts throughout the parenchyma leads to a **loss of corticomedullary differentiation**, as the entire kidney becomes uniformly hyperechoic. **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** Mutation in the **PKHD1 gene** on chromosome 6, encoding the protein **fibrocystin**. * **Liver Involvement:** ARPKD is invariably associated with **Congenital Hepatic Fibrosis**. On imaging, look for biliary hamartomas or Caroli disease. * **Classic USG Sign:** "Large echogenic kidneys" in a neonate. * **Contrast Imaging:** On IVP, it may show a "sunburst" or "radial streaking" appearance due to contrast filling the dilated tubules.
Question 379: The "Bouquet of Flowers" appearance is classically seen in which of the following conditions?
- A. Autosomal Dominant Polycystic Kidney Disease (ADPKD)
- B. Autosomal Recessive Polycystic Kidney Disease (ARPKD)
- C. Horseshoe Kidney
- D. Medullary Sponge Kidney (Correct Answer)
Explanation: ### Explanation **Correct Answer: D. Medullary Sponge Kidney (MSK)** **The Medical Concept:** Medullary Sponge Kidney is a congenital condition characterized by ectasia (dilatation) of the **pre-calyceal collecting ducts** in the renal pyramids. On an **Intravenous Urogram (IVU)**, the contrast medium fills these dilated tubules. This creates a characteristic streaky or brush-like appearance. When these dilated tubules are filled with contrast and surround the minor calyces, it resembles a **"Bouquet of Flowers"** or a **"Paintbrush"** appearance. **Why the other options are incorrect:** * **ADPKD:** Characterized by large, distorted kidneys with multiple cysts of varying sizes throughout the cortex and medulla. On imaging, it shows a "Swiss Cheese" appearance or "Spider Leg" deformity of the calyces due to stretching. * **ARPKD:** Typically presents in infancy with bilaterally enlarged, echogenic kidneys. On IVU, it shows a "Sunburst" or "Radial Spoke" pattern due to contrast filling elongated, radially oriented cysts. * **Horseshoe Kidney:** This is a fusion anomaly (usually at the lower poles). The classic radiological sign is the "Handshaking" appearance or abnormal axis of the kidneys (lower poles pointing medially). **High-Yield Clinical Pearls for NEET-PG:** * **MSK Associations:** Often associated with **Nephrocalcinosis** (calcium phosphate/oxalate stones) and recurrent UTIs. * **Hypercalciuria:** MSK is a common cause of idiopathic hypercalciuria and stone formation in young adults. * **Imaging Gold Standard:** While CT Urography is now common, the "Bouquet of Flowers" is a classic **IVU** description. * **Key Differential:** Do not confuse the "Paintbrush" of MSK with the "Papillary Necrosis" (Ring sign/Lobster claw sign).
Question 380: An X-ray of the abdomen shows multiple fluid levels. What is the most likely diagnosis?
- A. Intestinal obstruction (Correct Answer)
- B. Hollow viscus perforation
- C. Pyoperitoneum
- D. None of the above
Explanation: **Explanation:** **1. Why Intestinal Obstruction is Correct:** The presence of **multiple air-fluid levels** on an erect abdominal X-ray is a classic radiological hallmark of **mechanical intestinal obstruction**. When the normal forward flow of contents is blocked, gas and liquid accumulate in the dilated loops of the bowel. Gravity causes the fluid to settle at the bottom while gas rises to the top, creating a distinct horizontal interface (the fluid level). * **Small Bowel Obstruction (SBO):** Typically shows multiple central loops with a "step-ladder" appearance. More than 2–3 fluid levels are considered pathological. * **Large Bowel Obstruction:** Shows peripheral loops with haustral markings. **2. Why Other Options are Incorrect:** * **B. Hollow Viscus Perforation:** The characteristic radiological finding here is **pneumoperitoneum** (free air under the diaphragm on an erect chest/abdominal X-ray), not multiple fluid levels within the bowel. * **C. Pyoperitoneum:** This refers to pus in the peritoneal cavity. While it may cause a generalized "ground-glass" haziness (ascites appearance) or an adynamic ileus, it does not typically present with the classic multiple fluid levels seen in mechanical obstruction. **3. NEET-PG High-Yield Pearls:** * **Step-ladder pattern:** Classic sign of SBO on an erect film. * **String of beads/pearls sign:** Small bubbles of gas trapped between valvulae conniventes in a fluid-filled small bowel; highly suggestive of SBO. * **Coffee bean sign:** Pathognomonic for Sigmoid Volvulus. * **Coiled spring appearance:** Seen on contrast studies/ultrasound in Intussusception. * **Rule of 3-6-9:** Normal bowel diameter is <3cm (Small bowel), <6cm (Large bowel), and <9cm (Cecum). Anything above this suggests dilatation/obstruction.
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