Abdominal and Pelvic Radiology Practice Questions

Q: What is the most sensitive investigation for detecting minimal gas in the abdomen?

CT Scan of the abdomen. ***CT Scan of the abdomen*** - **CT scans** are highly sensitive for detecting even small amounts of **free air (pneumoperitoneum)** due to their ability to produce cross-sectional images with high spatial resolution missing in conventional X-rays. - It can identify the exact location and quantify the volume of gas, often picking up gas that is not visible on plain radiographs. *Chest X-ray in AP View* - An **AP chest X-ray** is less sensitive for detecting subdiaphragmatic free air compared to an erect chest X-ray or CT scan. - With the patient supine (as implied by AP view if not specified as erect), small amounts of gas tend to spread diffusely rather than collect under the diaphragm. *X-ray abdomen in supine position* - A supine abdominal X-ray is generally the **least sensitive** plain radiograph for detecting free air. - Gas in the abdomen tends to accumulate anteriorly when the patient is supine, making it more difficult to visualize against overlying bowel gas or soft tissues. *X-ray abdomen in erect position* - An **erect abdominal X-ray** or erect chest X-ray is commonly used and more sensitive than a supine view for detecting free air, as gas can rise and collect under the diaphragm. - However, it still requires a sufficient volume of gas to be visible and is less sensitive than a CT scan, especially for very minimal amounts or atypical locations.

Q: In a voiding cystourethrogram (VCUG), which condition is characterized by an adder head appearance?

Ureterocele. ***Ureterocele*** - An **adder head appearance** on a VCUG is characteristic of a **ureterocele**, which is a cystic dilation of the distal intra-vesical ureter. - This appearance is due to the dilated ureterocele protruding into the bladder lumen, resembling the head of an adder. *Posterior urethral valve* - This condition presents as a **filling defect** or **narrowing of the posterior urethra** on VCUG, often with dilation of the prostatic urethra and reflux into the seminal vesicles. - It does not typically cause an "adder head" appearance. *Bladder tumour* - A bladder tumour typically appears as a **filling defect** within the bladder lumen or an **irregularity of the bladder wall** on a VCUG. - This morphology is distinctly different from the characteristic appearance of a ureterocele. *Horse shoe kidney* - Horseshoe kidney is a congenital anomaly where the **kidneys are fused**, usually at their lower poles, and is a finding on **renal imaging** (e.g., ultrasound, CT, IVP), not typically on a VCUG of the bladder and urethra alone. - It does not produce an "adder head" appearance as it relates to renal structure, not bladder or ureteral dilation.

Q: Mercedes Benz sign is seen in:

Gallstone. ***Correct Option: Gallstone*** The **Mercedes Benz sign** is a classic radiologic finding specifically associated with **gallstones**, particularly cholesterol stones. - Appears as a **triradiate or stellate lucency** within the gallstone on plain radiographs, CT scans, or ultrasound - Named for its resemblance to the **Mercedes-Benz three-pointed star logo** - Caused by **nitrogen gas trapped within fissures or clefts** in the stone - Highly specific for gallstones when present *Incorrect Option: Bladder stone* - Bladder stones are calcifications in the **urinary bladder**, typically associated with urinary stasis, infection, or outlet obstruction - Appear as calcifications on imaging but **do not exhibit the Mercedes Benz sign** - This sign is unique to gallstones *Incorrect Option: Renal stones* - Renal stones (kidney stones) are found in the **kidneys or ureters** and are composed of various salts (calcium oxalate, uric acid, struvite, etc.) - Visible on imaging as calcifications or filling defects, but **do not show the Mercedes Benz sign** - This characteristic appearance is specific to certain types of gallstones *Incorrect Option: Foreign body in bronchus* - A foreign body in the bronchus presents as an **opaque or radiolucent object within the airway** on chest imaging - May cause complications like atelectasis, air trapping, or pneumonia - **No association** with the Mercedes Benz sign, which is specific to gallstones

Q: Christmas tree appearance of urinary bladder is seen in

Neurogenic bladder dysfunction. ***Neurogenic bladder dysfunction*** - The "Christmas tree appearance" refers to the **trabeculated and irregular bladder wall** with associated **bladder diverticula** seen on a voiding cystourethrogram (VCUG). - This appearance is characteristic of chronic, high-pressure bladder emptying due to **neurological impairment**, leading to hypertrophy of the detrusor muscle. *Autonomous bladder function* - An autonomous bladder (or isolated detrusor contraction) typically results from **complete spinal cord lesions** above the sacral micturition center after spinal shock. - While it is a type of neurogenic bladder, it doesn't specifically correlate with the "Christmas tree appearance," which is broader and signifies any form of chronic bladder outlet obstruction or spasticity. *Nocturnal enuresis* - This refers to **involuntary urination during sleep** and is primarily a functional disorder, especially in children, without structural bladder changes. - It is not associated with the characteristic radiological findings of bladder wall hypertrophy or diverticula. *Urinary stress incontinence* - Characterized by **involuntary leakage of urine** during physical activity that increases intra-abdominal pressure. - This condition is typically due to **urethral hypermobility** or **intrinsic sphincter deficiency** and does not involve structural changes to the bladder wall itself that would cause a "Christmas tree appearance."

Q: A delayed intravenous urogram of a patient is given below. What is the likely diagnosis?

Pelviureteric junction obstruction. ***Pelviureteric junction obstruction*** - The image shows marked **dilatation of the renal pelvis and calyces** on the right side, with a relatively abrupt narrowing at the junction of the pelvis and ureter. - The delayed nature of the urogram suggests **impaired drainage** of contrast from the renal pelvis, accumulating proximal to the obstruction. *Putty kidney* - A "putty kidney" (or **autonecrotic kidney**) refers to a chronic, severely diseased kidney, often seen in end-stage **renal tuberculosis**, that has become calcified and non-functional. - This image demonstrates active contrast excretion and pelvicalyceal dilatation, not a calcified, non-functional organ. *Staghorn calculus* - A staghorn calculus is a **large, branched kidney stone** that occupies a significant portion of the renal collecting system. - While it can cause hydronephrosis, the image does not show a dense, radiopaque calculus filling the collecting system. *Cystic kidney* - **Cystic kidneys**, such as in polycystic kidney disease, are characterized by multiple fluid-filled sacs within the kidney parenchyma. - The image depicts dilatation of the collecting system, not diffuse cystic changes throughout the renal parenchyma.

Q: A female patient presented with recurrent urinary tract infections. Imaging shows the following picture. What can be the most probable diagnosis based on the imaging findings?

Ureterocele. ***Ureterocele (Correct Answer)*** - The image shows a **cystic dilation of the distal ureter** (red arrow) that protrudes into the bladder, which is characteristic of a ureterocele. - Ureteroceles can cause **obstruction and recurrent UTIs** due to stasis and impaired emptying. *Ureteral duplication (Incorrect)* - Ureteral duplication would present as two distinct ureters draining from the same kidney, typically with separate insertions into the bladder or urethra. This is not observed in the image, as there is only one ureter visible from each kidney down to the bladder. - While complete ureteral duplication often features an *ectopic* and *obstructed* upper pole ureter, the imaging here primarily shows a bladder abnormality. *Congenital megaureter (Incorrect)* - A congenital megaureter involves a **diffusely dilated ureter** along its length, without the focal, cystic protrusion into the bladder seen here. - While it can cause UTIs due to stasis, the specific localized dilation inside the bladder strongly points away from this diagnosis. *Urinary calculi (Incorrect)* - Urinary calculi (stones) would appear as **hyperdense opacities within the collecting system** or ureter, which could cause obstruction and UTIs. - The image distinctly shows a **fluid-filled, balloon-like structure** at the ureterovesical junction, not a calcified stone.

Q: The Barium Swallow examination shows a mass in the esophagus. What can be the most probable diagnosis?

Esophageal Cancer. ***Esophageal Cancer*** - A **mass** identified in the esophagus on **Barium Swallow** is highly suggestive of esophageal cancer, typically presenting as a **solitary lesion**. - Other associated features may include **dysphagia**, weight loss, and potentially lymphadenopathy on imaging. *Esophageal Ring (Stricture)* - Usually presents as a **narrowing of the esophagus** rather than a distinct mass on imaging, often causing intermittent **dysphagia**. - The appearance is more likely to cause **functional obstruction** rather than present as a **solid mass** in the esophagus. *Esophageal Perforation* - This condition would not present as a **mass**; instead, symptoms include **severe chest pain**, and may show mediastinal air on imaging. - Perforation leads to **acute symptoms** and signs of **infection**, differentiating it from a neoplastic process. *Achalasia* - Characterized by **dilated esophagus** with a **bird-beak appearance** on imaging rather than a discrete mass. - It commonly results in **dysphagia** for solids and liquids, not presenting as a mass lesion on Barium Swallow.

Q: In which condition is a gasless abdomen typically observed?

Acute pancreatitis. ***Acute pancreatitis*** - **Acute pancreatitis** with severe inflammation can lead to **reflex ileus** and **significant fluid accumulation** in the peritoneal cavity (ascites) and bowel wall edema - In **severe cases**, the combination of *paralytic ileus*, *massive fluid sequestration*, and *reduced oral intake* can result in a **gasless or nearly gasless abdomen** - Among the given options, this represents the most likely scenario for a gasless abdomen due to **bowel dysfunction and fluid displacement of gas** - Note: Classic findings in pancreatitis may include **sentinel loop** or **colon cut-off sign**, but severe cases with massive ascites can present with minimal gas *Intussusception* - Causes **bowel obstruction** with characteristic *dilated bowel loops* and *air-fluid levels* proximal to the obstruction - Shows **gas patterns** rather than absent gas; may show *absence of gas in right lower quadrant* (dance sign) but not generalized gasless abdomen - Ultrasound shows classic **"target sign"** or **"pseudokidney sign"** *Ulcerative colitis* - **Inflammatory bowel disease** affecting the colon with *mucosal inflammation* and *colonic wall thickening* - In severe cases, may develop **toxic megacolon** showing a *markedly dilated colon* with visible gas and loss of haustral markings - A gasless abdomen is **not characteristic**; gas is typically present *Necrotising enterocolitis* - Common in **premature neonates**; characterized by *bowel wall necrosis* and ischemia - Classic radiographic findings include **pneumatosis intestinalis** (gas in bowel wall) and **portal venous gas** - Shows **abnormal gas patterns** rather than absent gas, making a gasless abdomen unlikely

Q: What does the sign depicted in the image represent?

Mickey mouse sign. ***Mickey mouse sign*** - The **Mickey Mouse sign** is a radiological finding seen on **cross-sectional imaging (CT/ultrasound)** of the porta hepatis. - It represents the appearance of the **portal vein** (forming the "face") with the **hepatic artery and common bile duct** on either side (forming the "ears"). - This anatomical configuration in transverse sections resembles Mickey Mouse's face and ears. - It is a normal anatomical landmark used for orientation in hepatobiliary imaging. *String sign* - The **string sign** is a radiological finding where a segment of bowel lumen is narrowed to a thin string-like appearance. - Commonly seen in **Crohn's disease** due to chronic inflammation and stricture formation, typically affecting the terminal ileum. - Can also refer to a severely stenotic mitral valve on cardiac angiography. *Tillaux sign* - The **Tillaux fracture** is a **Salter-Harris type III fracture** of the anterolateral distal tibial epiphysis. - This is a **radiological fracture pattern** seen in adolescents during skeletal maturation. - The fracture line extends from the articular surface through the epiphysis and out through the lateral physis. - Not to be confused with a clinical examination finding. *Stemmer's sign* - **Stemmer's sign** is a **clinical examination finding**, not a radiological sign. - Used to diagnose **lymphedema** - positive if the skin on the dorsal aspect of the second toe cannot be lifted or tented. - Indicates tissue thickening due to chronic lymphatic fluid accumulation.

Q: Which radiological finding is shown in the image?

Intussusception. ***Intussusception*** - The image clearly displays the classic "coiled spring" appearance, which is pathognomonic for **intussusception** on a barium enema study. This pattern is created by barium trapped between the intussusceptum and intussuscipiens. - The arrow specifically points to the leading edge of the intussusception, where the bowel telescopes into an adjacent segment. *Colon carcinoma* - Colon carcinoma typically presents as an **irregular narrowing** or an **apple-core lesion** on barium studies, a sign of luminal stricture due to a mass. - The radiological appearance for carcinoma would not show the distinct layered or coiled pattern seen in the provided image. *Sigmoid volvulus* - Sigmoid volvulus is characterized by a **"coffee bean" sign** on plain radiographs due to the massively dilated, inverted U-shaped loop of colon, or a **"bird's beak" appearance** on contrast studies at the twisted obstruction point. - This contrasts significantly with the concentric rings and linear striations indicative of intussusception. *Ileus* - Ileus, or paralytic ileus, involves generalized **bowel dilation** without a clear point of mechanical obstruction, often with gas present throughout the large and small bowel. - The image shows a very specific, localized abnormality with a characteristic pattern, not generalized bowel distension associated with ileus.

Question 1

What is the most sensitive investigation for detecting minimal gas in the abdomen?

Accepted Answer

CT Scan of the abdomen

Answer

Chest X-ray in AP View

Answer

X-ray abdomen in supine position

Answer

X-ray abdomen in erect position

Question 2

In a voiding cystourethrogram (VCUG), which condition is characterized by an adder head appearance?

Accepted Answer

Ureterocele

Answer

Posterior urethral valve

Answer

Bladder tumour

Answer

Horse shoe kidney

Question 3

Mercedes Benz sign is seen in:

Accepted Answer

Gallstone

Answer

Foreign body in bronchus

Answer

Bladder stone

Answer

Renal stones

Question 4

Christmas tree appearance of urinary bladder is seen in

Accepted Answer

Neurogenic bladder dysfunction

Answer

Autonomous bladder function

Answer

Nocturnal enuresis

Answer

Urinary stress incontinence

Question 5

A delayed intravenous urogram of a patient is given below. What is the likely diagnosis?

Accepted Answer

Pelviureteric junction obstruction

Answer

Putty kidney

Answer

Staghorn calculus

Answer

Cystic kidney

Question 6

A female patient presented with recurrent urinary tract infections. Imaging shows the following picture. What can be the most probable diagnosis based on the imaging findings?

Accepted Answer

Ureterocele

Answer

Ureteral duplication

Answer

Congenital megaureter

Answer

Urinary calculi

Question 7

The Barium Swallow examination shows a mass in the esophagus. What can be the most probable diagnosis?

Accepted Answer

Esophageal Cancer

Answer

Esophageal Ring (Stricture)

Answer

Esophageal Perforation

Answer

Achalasia

Question 8

In which condition is a gasless abdomen typically observed?

Accepted Answer

Acute pancreatitis

Answer

Intussusception

Answer

Ulcerative colitis

Answer

Necrotising enterocolitis

Question 9

What does the sign depicted in the image represent?

Accepted Answer

Mickey mouse sign

Answer

String sign

Answer

Tillaux sign

Answer

Stemmer's sign

Question 10

Which radiological finding is shown in the image?

Accepted Answer

Intussusception

Answer

Colon carcinoma

Answer

Sigmoid volvulus

Answer

Ileus

Abdominal and Pelvic Radiology — MCQs

Abdominal and Pelvic Radiology — MCQs

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