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ARDMS AB-Abdomen Exam Syllabus Topics:
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NEW QUESTION # 10
A 60-year-old man presents to the emergency room, complaining of tearing pain in the chest and abdomen.
Blood pressure readings from the two arms show a difference of more than 20 mm. Which ultrasound finding is most likely associated with this presentation?
- A. Thickened gallbladder wall
- B. Pericardial fluid
- C. Intimal flap in the aorta
- D. Echogenic material in the inferior vena cava
Answer: C
Explanation:
An intimal flap in the aorta is a hallmark ultrasound finding of aortic dissection, which can present with tearing chest/abdominal pain and differential blood pressures between arms. The flap represents separation of the intimal and medial layers of the aortic wall.
According to Rumack's Diagnostic Ultrasound:
"An intimal flap visualized within the aorta is diagnostic of an aortic dissection." Reference:
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.
American Heart Association (AHA) Guidelines for Aortic Disease, 2020.
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NEW QUESTION # 11
Which condition is demonstrated in this image?
- A. Tumor extension
- B. Cavernous transformation
- C. Portal vein thrombosis
- D. Portal hypertension
Answer: B
Explanation:
The image shows a color Doppler ultrasound of the main portal vein (MPV), which appears irregular and replaced by multiple small, serpiginous vascular channels - a hallmark of cavernous transformation.
Cavernous transformation of the portal vein is a late complication of chronic portal vein thrombosis, in which collateral vessels develop around the thrombosed portal vein to bypass the obstruction.
Key Doppler ultrasound features of cavernous transformation:
* Absence of a normal portal vein
* Multiple tortuous vessels in the porta hepatis
* Color Doppler shows hepatopetal flow in these channels
* Low velocity, continuous waveform flow in collateral vessels
Differentiation from other options:
* B. Portal vein thrombosis: Would show an absence of color flow within the portal vein lumen and possibly echogenic material within the vessel. There would be no serpiginous collateral vessels yet if it's an acute process.
* C. Portal hypertension: Often diagnosed with other sonographic findings (e.g., splenomegaly, reversed portal flow, varices) but not characterized by the replacement of the portal vein by collateral vessels.
* D. Tumor extension: Typically appears as echogenic intraluminal material within the portal vein with arterial waveforms on Doppler due to neovascularity. Tumor thrombus can be seen in hepatocellular carcinoma or pancreatic cancer, not multiple small collateral vessels.
References:
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th Edition. Elsevier, 2018.
Chapter: Portal Venous System, pp. 107-110.
American Institute of Ultrasound in Medicine (AIUM). Practice Parameter for the Performance of a Vascular Ultrasound Examination, 2021.
Radiopaedia.org. Cavernous transformation of the portal vein: https://radiopaedia.org/articles/cavernous- transformation-of-the-portal-vein
NEW QUESTION # 12
A patient presents with ampulla of Vater obstruction, distention of the gallbladder, and painless jaundice.
Which condition is most likely associated with these findings?
- A. Choledochal cyst
- B. Mirizzi syndrome
- C. Courvoisier sign
- D. Porcelain gallbladder
Answer: C
Explanation:
Courvoisier sign describes the clinical finding of painless jaundice combined with a palpable, distended gallbladder. This typically results from obstruction at the distal common bile duct, often due to pancreatic head carcinoma or cholangiocarcinoma, leading to bile accumulation and gallbladder distention. In contrast, Mirizzi syndrome involves compression of the common hepatic duct by an impacted stone in the cystic duct.
According to Rumack's Diagnostic Ultrasound and standard clinical references:
"Courvoisier sign refers to a palpable, enlarged gallbladder due to obstruction of the distal bile duct, often from malignancy." Reference:
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.
Moore KL. Clinically Oriented Anatomy. 8th ed. Wolters Kluwer, 2018.
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NEW QUESTION # 13
Which condition is most consistent with this image of a postsurgical breast?
- A. Abscess
- B. Seroma
- C. Blood clot
- D. Carcinoma
Answer: B
Explanation:
The ultrasound image reveals a well-defined, anechoic (black), thin-walled fluid collection located in the subcutaneous or parenchymal plane of the breast. This is most consistent with a seroma, particularly in the context of recent breast surgery.
A seroma is a common postsurgical finding, representing a sterile collection of serous fluid that accumulates in the surgical bed. It typically appears:
* Anechoic (or hypoechoic if older)
* Well circumscribed
* Without internal septations or debris
* Lacking hyperemia or surrounding inflammatory changes
This contrasts with:
* A. Carcinoma - typically presents as an irregular, hypoechoic mass with angular margins, internal vascularity, and shadowing.
* B. Blood clot (hematoma) - often appears heterogeneous, with internal echoes and variable echotexture depending on the age of the clot.
* C. Abscess - appears as a complex fluid collection with thick walls, internal debris, septations, and surrounding hyperemia (often with clinical signs of infection).
D: Seroma - Correct. The described anechoic, clean-walled fluid collection is classic for a postoperative seroma.
References:
Mendelson EB, Bohm-Velez M, Berg WA.ACR BI-RADS Atlas: Ultrasound. American College of Radiology; 2013.
Stavros AT. Breast Ultrasound. Lippincott Williams & Wilkins; 2004.
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound, 5th ed. Elsevier; 2017.
NEW QUESTION # 14
Which scanning approach was utilized to obtain this image?
- A. Right coronal
- B. Anterior
- C. Posterior
- D. Left coronal
Answer: A
Explanation:
The ultrasound image provided shows the liver and diaphragm imaged in a coronal plane with characteristic rib shadows and costophrenic angles. The orientation of the image and the structures visualized suggest that the transducer is placed in the right mid-axillary line, with the sound beam directed coronally - this is a classic right coronal scanning approach.
Key features supporting this:
* The liver appears superiorly in the image.
* Multiple echogenic lines (representing the ribs) run obliquely, casting acoustic shadows.
* The diaphragm and adjacent lung base are seen clearly, which is commonly imaged through the right intercostal spaces in a coronal plane.
Comparison of answer choices:
* A. Anterior: Would show a more transverse view of the liver and not typically image the diaphragm and lung this way.
* B. Posterior: Not used for upper abdominal scanning due to shadowing from the spine and posterior ribs.
* C. Left coronal: Would show the spleen and left kidney - not the liver as seen here.
* D. Right coronal - Correct. This image was obtained using the right coronal (intercostal) approach through the right flank.
References:
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound, 5th ed. Elsevier; 2017.
Hagen-Ansert SL. Textbook of Diagnostic Sonography, 8th ed. Elsevier; 2017.
AIUM Practice Parameter for the Performance of an Ultrasound Examination of the Abdomen and/or Retroperitoneum (2020).
NEW QUESTION # 15
A patient with hepatocellular carcinoma presents for a paracentesis. Which lab value is the most pertinent to the procedure?
- A. Alpha fetoprotein
- B. International normalized ratio
- C. Total bilirubin
- D. Alanine aminotransferase
Answer: B
Explanation:
Before performing a paracentesis, assessment of the patient's coagulation status is crucial to minimize bleeding risk. The International Normalized Ratio (INR) is the standard lab value used to assess coagulation.
Elevated INR may increase the risk of bleeding complications during the procedure. ALT, AFP, and bilirubin levels evaluate liver function or cancer progression but are not directly relevant to bleeding risk for this procedure.
As per AASLD and SIR guidelines:
"An INR and platelet count should be evaluated before paracentesis to assess bleeding risk. Minor elevations in INR (<1.5) may not contraindicate the procedure." (AASLD Practice Guidance, 2021; SIR Consensus Guidelines, 2019).
Reference:
American Association for the Study of Liver Diseases (AASLD), Management of Ascites, 2021.
Society of Interventional Radiology (SIR) Consensus Guidelines for Coagulation Parameters in Image- Guided Procedures, 2019.
NEW QUESTION # 16
Which syndrome is characterized by right upper quadrant pain, ascites, and hepatocellular dysfunction?
- A. Ehlers-Danlos
- B. Budd-Chiari
- C. Calciphylaxis
- D. Klippel-Trenaunay
Answer: B
Explanation:
Budd-Chiari syndrome is caused by hepatic venous outflow obstruction, resulting in hepatomegaly, ascites, right upper quadrant pain, and liver dysfunction. It may be due to thrombosis or compression of the hepatic veins or IVC.
According to Rumack's Diagnostic Ultrasound:
"Budd-Chiari syndrome results from hepatic venous outflow obstruction and presents with hepatomegaly, ascites, and right upper quadrant pain." Reference:
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.
AIUM Practice Parameter for Liver Ultrasound, 2020.
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NEW QUESTION # 17
Which adjustment would most likely improve visualization of a small superficial tubular structure such as a peripheral artery?
- A. Decreasing frame rate
- B. Decreasing power output
- C. Decreasing transducer wavelength
- D. Decreasing slice width
Answer: D
Explanation:
Reducing slice (section) width improves spatial resolution, particularly elevational resolution, which enhances visualization of small, superficial structures. Lower slice width reduces off-axis beam artifacts and blurring.
Wavelength depends on transducer frequency, not adjustable directly during scanning.
According to Zwiebel's Introduction to Vascular Ultrasound:
"Reduction in slice thickness improves imaging of small superficial structures by minimizing volume averaging and improving elevational resolution." Reference:
Zwiebel WJ, Pellerito JS. Introduction to Vascular Ultrasound. 6th ed. Elsevier, 2019.
AIUM Practice Parameter for Vascular Ultrasound, 2021.
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NEW QUESTION # 18
Which sonographic feature is typical of a thyroid adenoma?
- A. Hypoechoic halo
- B. Irregular border
- C. Hyperechoic nodule
- D. Through transmission
Answer: A
Explanation:
Thyroid adenomas typically present as well-defined nodules surrounded by a thin, hypoechoic peripheral halo representing compressed thyroid parenchyma or fibrous capsule. Irregular margins suggest malignancy.
According to Rumack's Diagnostic Ultrasound:
"A thin hypoechoic halo is characteristic of benign thyroid adenomas."
Reference:
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.
AIUM Practice Parameter for Thyroid Ultrasound, 2020.
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NEW QUESTION # 19
What is the innermost layer of the gut wall?
- A. Serosa
- B. Mucosa
- C. Submucosa
- D. Muscularis externa
Answer: B
Explanation:
The mucosa is the innermost layer of the gastrointestinal wall, consisting of epithelium, lamina propria, and muscularis mucosae. It is responsible for absorption and secretion. The submucosa lies just outside the mucosa.
According to Moore's Clinically Oriented Anatomy:
"The mucosa is the innermost layer of the gastrointestinal tract, responsible for nutrient absorption and secretion." Reference:
Moore KL, Dalley AF, Agur AMR. Clinically Oriented Anatomy. 8th ed. Wolters Kluwer, 2018.
Rumack CM, Diagnostic Ultrasound, 5th ed. Elsevier, 2017.
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NEW QUESTION # 20
Which sonographic finding indicates the need for immediate surgical intervention following testicular trauma?
- A. Discontinuity of the tunica albuginea
- B. Increased testicular vascularity
- C. Intratesticular hematoma
- D. Heterogeneity of the testicular parenchyma
Answer: A
Explanation:
The tunica albuginea is a dense fibrous capsule surrounding the testis. Discontinuity of the tunica albuginea on ultrasound is diagnostic of testicular rupture - a urologic emergency that requires immediate surgical repair to preserve testicular function and viability. Early surgical intervention within 72 hours has a high success rate for testicular salvage (up to 90%).
* Intratesticular hematoma (A) may be managed conservatively if the tunica albuginea is intact.
* Heterogeneity of the parenchyma (C) indicates injury but not necessarily rupture.
* Increased vascularity (D) may be seen with inflammation or reperfusion but does not mandate surgery unless rupture is present.
Reference Extracts:
* Dogra VS, Bhatt S. "Acute painful scrotum: ultrasound evaluation." Radiologic Clinics of North America. 2004; 42(2):349-363.
* Middleton WD, Kurtz AB, Hertzberg BS.Ultrasound: The Requisites. 3rd ed. Elsevier, 2015.
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NEW QUESTION # 21
Which vascular condition is most consistent with patent cutaneous para-umbilical channels and portal hypertension?
- A. Splenic vein varices
- B. Esophageal varices
- C. Caput medusae
- D. Coronary vein varices
Answer: C
Explanation:
Caput medusae refers to dilated paraumbilical veins due to portal hypertension. When portal venous pressure rises, collateral channels may open along the ligamentum teres and recanalized paraumbilical vein, resulting in visible dilated veins radiating from the umbilicus.
* Esophageal varices (B) are gastroesophageal collaterals.
* Coronary vein varices (C) involve gastric veins.
* Splenic vein varices (D) are typically localized to the splenic hilum.
Reference Extracts:
* Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.
* Gore RM, Levine MS. Textbook of Gastrointestinal Radiology. 4th ed. Saunders, 2015.
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NEW QUESTION # 22
Which of the following would optimize visualization of a bladder mass?
- A. Have patient empty bladder
- B. Have patient fill bladder
- C. Compression technique to move bowel gas
- D. Utilize a high-frequency linear transducer
Answer: B
Explanation:
A full bladder provides an acoustic window that displaces bowel gas and distends the bladder walls, allowing optimal visualization of any bladder masses or lesions. An empty bladder may collapse, obscuring masses.
According to Rumack's Diagnostic Ultrasound:
"Bladder evaluation should be performed with the bladder optimally distended to visualize its walls and any intraluminal masses." Reference:
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.
AIUM Practice Parameter for Bladder Ultrasound, 2020.
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NEW QUESTION # 23
Based on this image, which congenital anomaly should be suspected?
- A. Horseshoe kidney
- B. Supernumerary kidney
- C. Pancreas divisum
- D. Annular pancreas
Answer: D
Explanation:
The ultrasound image demonstrates a dilated duodenum with a hypoechoic soft tissue structure encircling it.
This is a classic sonographic appearance suggestive of an annular pancreas. In annular pancreas, pancreatic tissue completely or partially encircles the second portion of the duodenum, which can lead to duodenal narrowing or obstruction.
Annular pancreas is a congenital anomaly that results from failure of the ventral pancreatic bud to rotate properly during embryologic development. As a result, pancreatic tissue encircles the duodenum. It may present in neonates with symptoms of duodenal obstruction or in adults with abdominal pain, pancreatitis, or vomiting.
Ultrasound Findings:
* Hypoechoic pancreatic tissue encircling the duodenum
* Evidence of duodenal dilatation proximal to the obstruction
* "Double bubble" sign may be seen in neonates
Differentiation from other options:
* A. Supernumerary kidney: Refers to an accessory kidney. It would be seen in the retroperitoneum and is unrelated to the duodenum or pancreas.
* B. Pancreas divisum: A ductal anomaly best diagnosed on MRCP or ERCP. It is not typically visible on conventional ultrasound.
* D. Horseshoe kidney: A renal fusion anomaly where the lower poles of the kidneys are fused. It is seen in the pelvis or lower abdomen and does not involve the duodenum or pancreas.
References:
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th Edition. Elsevier, 2018.
Chapter: Pancreas, pp. 269-272.
Radiopaedia.org. Annular pancreas: https://radiopaedia.org/articles/annular-pancreas AIUM Practice Parameter for the Performance of Abdominal and Retroperitoneal Ultrasound Examinations,
2020.
NEW QUESTION # 24
Which congenital disorder is most consistent with the finding identified by the arrow on this image?
- A. Caroli disease
- B. Biliary atresia
- C. Alagille syndrome
- D. Sclerosing cholangitis
Answer: A
Explanation:
The image demonstrates a characteristic "central dot sign" - a hallmark finding of Caroli disease. This is best appreciated on ultrasound as a cystic dilation of the intrahepatic bile ducts with a central echogenic dot or linear structure (which corresponds to the portal vein and fibrous tissue within the dilated duct). The arrow in the image points to one such dilated duct.
Caroli disease is a rare congenital disorder characterized by segmental, saccular dilation of intrahepatic bile ducts. It is often associated with congenital hepatic fibrosis and may predispose to cholangitis, stone formation, and even cholangiocarcinoma.
Key ultrasound features of Caroli disease:
* Cystic or saccular dilations of the intrahepatic bile ducts
* The "central dot sign" - echogenic focus in the center of the dilated ducts (representing portal vein radicle or fibrous tissue)
* May show associated hepatosplenomegaly or signs of portal hypertension Differentiation from other options:
* A. Sclerosing cholangitis: Typically causes diffuse or segmental biliary ductal wall thickening and stricturing; does not present with cystic dilations.
* B. Alagille syndrome: A multisystem disorder often characterized by a paucity of intrahepatic bile ducts, not dilation.
* D. Biliary atresia: Presents in infancy with obliteration of extrahepatic bile ducts, echogenic "triangular cord" sign, and absence of a visible gallbladder. It does not cause ductal dilation.
References:
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th Edition. Elsevier, 2018.
Chapter: Biliary System, pp. 152-155.
Radiopaedia.org. Caroli disease. https://radiopaedia.org/articles/caroli-disease American College of Radiology (ACR). ACR-SPR Practice Parameter for the Performance of Pediatric Abdominal Ultrasound, 2022.
NEW QUESTION # 25
Which arteries are the immediate branches of the celiac trunk?
- A. Proper hepatic, splenic, and gastroduodenal
- B. Common hepatic, splenic, and right gastric
- C. Common hepatic, splenic, and left gastric
- D. Proper hepatic, splenic, and supraduodenal
Answer: C
Explanation:
The celiac trunk arises from the abdominal aorta and immediately divides into three primary branches:
* Left gastric artery
* Common hepatic artery
* Splenic artery
The proper hepatic and gastroduodenal arteries are secondary branches of the common hepatic artery.
According to Moore's Clinically Oriented Anatomy:
"The celiac trunk trifurcates into the left gastric, common hepatic, and splenic arteries." Reference:
Moore KL, Dalley AF, Agur AMR. Clinically Oriented Anatomy. 8th ed. Wolters Kluwer, 2018.
Gray's Anatomy for Students, 4th ed., Elsevier, 2019.
NEW QUESTION # 26
Which vascular condition is most commonly associated with a wandering spleen?
- A. Infarction
- B. Rupture
- C. Portal hypertension
- D. Torsion
Answer: D
Explanation:
A wandering spleen occurs when the spleen is not adequately anchored by its supporting ligaments, allowing it to move freely within the abdomen. This increases the risk of splenic torsion, which compromises vascular supply and may result in infarction if not corrected.
According to Rumack's Diagnostic Ultrasound:
"The most serious complication of a wandering spleen is torsion, which may result in splenic infarction." Reference:
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.
Moore KL, Clinically Oriented Anatomy. 8th ed. Wolters Kluwer, 2018.
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NEW QUESTION # 27
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