Which condition is most likely associated with a common bile duct measuring 5 mm?
Answer(s): A
A common bile duct (CBD) measuring up to 5 mm is considered normal in most patients under age60. Some references allow for up to 6 mm, especially post-cholecystectomy or in older individuals. Significant dilation (suggestive of obstruction) typically exceeds these measurements.According to Rumack's Diagnostic Ultrasound:"The normal common bile duct measures up to 56 mm, with slight increases considered normal after cholecystectomy or with advancing age."
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.AIUM Practice Parameter for Abdominal Ultrasound, 2020.
Which laboratory value stays elevated longest and is considered the most reliable in diagnosing pancreatitis?
Lipase is the most sensitive and specific laboratory marker for diagnosing acute pancreatitis. It rises earlier, remains elevated longer (up to 14 days), and is more pancreas-specific than amylase. Amylase may normalize within 48-72 hours and may also be elevated in non-pancreatic conditions.According to ACG (American College of Gastroenterology) Guidelines:"Serum lipase is preferred over amylase due to its higher sensitivity, specificity, and prolonged elevation in pancreatitis."
American College of Gastroenterology (ACG) Clinical Guideline: Management of Acute Pancreatitis, 2013.Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.
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?
Answer(s): C
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."
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.American Heart Association (AHA) Guidelines for Aortic Disease, 2020.
What is the most common cause of nutcracker syndrome?
Answer(s): B
Nutcracker syndrome results from compression of the left renal vein between the superior mesenteric artery (SMA) and the aorta. This can cause hematuria, flank pain, and pelvic congestion due to impaired venous drainage.According to Zwiebel's Introduction to Vascular Ultrasound:"In nutcracker syndrome, the left renal vein is compressed between the aorta and SMA, resulting in venous hypertension."
Zwiebel WJ, Pellerito JS. Introduction to Vascular Ultrasound. 6th ed. Elsevier, 2019.AIUM Practice Parameter for Abdominal Vascular Ultrasound, 2020.
Which parameter is most likely increased distal to a renal artery stenosis?
Downstream from a significant renal artery stenosis, the acceleration time is prolonged due to delayed systolic upstroke ("tardus-parvus waveform"). This is a sensitive Doppler parameter for detecting hemodynamically significant stenosis. Spectral broadening usually occurs at the stenotic site, not distal to it.According to Zwiebel's Introduction to Vascular Ultrasound:"Prolonged acceleration time and reduced acceleration index characterize tardus-parvus waveforms distal to renal artery stenosis."
Zwiebel WJ, Pellerito JS. Introduction to Vascular Ultrasound. 6th ed. Elsevier, 2019.AIUM Practice Parameter for Renal Artery Duplex Doppler Ultrasound, 2020.
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