Hepatitis is classified into groups. Which of these four types are transmitted by fecal-oral route?
Answer(s): A
Hepatitis A is primarily transmitted via the fecal-oral route, often through contaminated food or water. Hepatitis B, C, and D are transmitted through blood and body fluids.According to CDC and WHO guidelines:"Hepatitis A virus (HAV) is transmitted primarily by the fecal-oral route via ingestion of contaminated food or water."
CDC. Viral Hepatitis Surveillance -- United States, 2020.WHO. Hepatitis A Fact Sheet, 2022.
A patient presents with ampulla of Vater obstruction, distention of the gallbladder, and painless jaundice. Which condition is most likely associated with these findings?
Answer(s): C
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."
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.Moore KL. Clinically Oriented Anatomy. 8th ed. Wolters Kluwer, 2018.
Which sonographic finding is most consistent with scrotal inflammation?
Answer(s): D
Scrotal inflammation, such as epididymitis or orchitis, typically presents with increased blood flow (hyperemia) on color Doppler sonography. This finding reflects the inflammatory process and vascular dilation. Abscesses, granulomas, or hydroceles may be present but are not as consistent or specific for inflammation.According to AIUM Practice Parameters and Rumack's Diagnostic Ultrasound:"In acute inflammation, color Doppler ultrasound demonstrates prominent hyperemia of the epididymis or testis."
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.AIUM Practice Parameter for Scrotal Ultrasound, 2020.
Which description best characterizes a normal systolic spectral waveform of the renal artery?
A normal renal artery waveform demonstrates rapid systolic upstroke (acceleration) with continuous forward flow in diastole due to the kidney's low-resistance vascular bed. Slow acceleration or blunted peaks may indicate significant renal artery stenosis.According to Zwiebel's Introduction to Vascular Ultrasound:"Normal renal artery waveforms demonstrate a rapid systolic acceleration with a sharp systolic peak."
Zwiebel WJ, Pellerito JS. Introduction to Vascular Ultrasound. 6th ed. Elsevier, 2019.ACR Practice Parameter for the Performance of a Duplex Doppler Examination, 2021.
Which thyroid condition is most likely caused by a viral infection?
De Quervain thyroiditis (subacute granulomatous thyroiditis) is often triggered by a viral infection. Patients may present with painful thyroid enlargement, elevated inflammatory markers, and transient hyperthyroidism. Hashimoto's and Graves' diseases are autoimmune in nature.According to Braverman's The Thyroid:"Subacute (De Quervain) thyroiditis typically follows a viral upper respiratory tract infection and is characterized by thyroid pain and transient thyrotoxicosis."
Braverman LE, Cooper DS. The Thyroid: A Fundamental and Clinical Text. 11th ed. Wolters Kluwer, 2021.American Thyroid Association Guidelines, 2016.
Which technique may provide better visualization of the common bile duct in a patient with hepatic steatosis?
In hepatic steatosis (fatty liver), increased echogenicity can obscure visualization of deeper structures like the common bile duct. Lowering the transducer frequency increases sound wave penetration, allowing better visualization of deep structures despite increased liver echogenicity. Decreasing gain or increasing dynamic range primarily adjusts image brightness and contrast but does not improve penetration.According to Rumack's Diagnostic Ultrasound:"Lower frequency transducers are used to improve penetration and visualization of deeper structures in patients with fatty liver."
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.AIUM Practice Parameter for the Performance of Abdominal Ultrasound Examinations, 2020.
Which measurement is the upper limit for a normal gallbladder wall?
The normal gallbladder wall measures up to 3 mm. Thickening beyond 3 mm may suggest cholecystitis, heart failure, hepatitis, or hypoalbuminemia. Measurements should be taken with the patient fasting, using the anterior gallbladder wall.According to Rumack's Diagnostic Ultrasound:"The gallbladder wall is considered thickened if it measures greater than 3 mm."
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.AIUM Practice Parameter for the Performance of Gallbladder Ultrasound Examinations, 2020.
Which normal anatomical structure is also known as the accessory pancreatic duct?
The Duct of Santorini is the accessory pancreatic duct that drains the superior portion of the pancreatic head into the minor duodenal papilla. The main pancreatic duct (Duct of Wirsung) drains into the major papilla, often joining the common bile duct at the Ampulla of Vater.According to Moore's Clinically Oriented Anatomy:"The accessory pancreatic duct (Duct of Santorini) may be present and drains into the minor duodenal papilla."
Moore KL, Dalley AF, Agur AMR. Clinically Oriented Anatomy. 8th ed. Wolters Kluwer, 2018.Gray's Anatomy for Students, 4th ed., Elsevier, 2019.
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