ARDMS RDMS Abdominal Sonography Certification Exam 2026:
Comprehensive Practice Test — Abdominal Anatomy, Hepatobiliary
Imaging, Pancreas, Spleen, Urinary Tract, Vascular Structures &
Pathology — 190 Multiple-Choice Questions with Answers &
Detailed Rationales
SECTION 1: ANATOMY AND PHYSIOLOGY (Questions 1-30)
Question 1
Which anatomic structure serves as the primary landmark dividing the abdominal cavity into
supracolic and infracolic compartments?
A. Transverse mesocolon
B. Lesser omentum
C. Falciform ligament
D. Greater omentum
Correct Answer: A
Explanation: The transverse mesocolon anchors the transverse colon and separates the
supracolic compartment (stomach, liver, spleen) from the infracolic compartment. This
division is critical for understanding peritoneal spread patterns and fluid accumulation in
pathologic states.
Question 2
A patient presents with jaundice and right upper quadrant pain. Sonographic evaluation
reveals a dilated common bile duct measuring 10 mm. What is the most likely physiologic
explanation for this finding in a post-cholecystectomy patient?
,A. Normal compensatory dilation following gallbladder removal
B. Acute pancreatitis causing extrinsic compression
C. Choledocholithiasis obstructing the distal duct
D. Pancreatic pseudocyst compressing the biliary tree
Correct Answer: A
Explanation: Post-cholecystectomy patients may demonstrate mild compensatory common
bile duct dilation up to 10 mm due to loss of gallbladder reservoir function. This is a benign
finding that should not be confused with pathologic obstruction.
Question 3
The sonographic landmark known as the "Mickey Mouse" sign in the porta hepatis
represents which structures?
A. Common bile duct, hepatic artery, and portal vein
B. Right hepatic vein, middle hepatic vein, and left hepatic vein
C. Main portal vein, splenic vein, and superior mesenteric vein
D. Cystic duct, common hepatic duct, and common bile duct
Correct Answer: A
Explanation: The "Mickey Mouse" sign describes the portal triad in transverse section: the
portal vein forms the "face" with the common bile duct and hepatic artery as the "ears." This
landmark is essential for identifying biliary and vascular anatomy during abdominal
scanning.
Question 4
,Which sonographic feature best distinguishes the right hepatic vein from the right portal
vein?
A. The hepatic vein has a more echogenic wall
B. The portal vein demonstrates a pulsatile waveform
C. The hepatic vein walls are nearly imperceptible
D. The portal vein drains directly into the IVC
Correct Answer: C
Explanation: Hepatic veins lack the fibrofatty connective tissue sheaths that surround portal
veins, making their walls nearly invisible sonographically. Portal veins have echogenic walls
due to surrounding perivascular fibrous tissue, a key differentiator.
Question 5
A 45-year-old female presents with intermittent right flank pain. Sonography demonstrates a
duplicated collecting system on the right. Which embryologic structure failed to completely
regress?
A. Metanephric blastema
B. Ureteric bud
C. Pronephros
D. Mesonephric duct
Correct Answer: B
, Explanation: Duplicated collecting systems result from premature bifurcation of the ureteric
bud during embryogenesis. This anomaly predisposes patients to vesicoureteral reflux and
ureterocele formation, requiring careful evaluation of both moieties.
Question 6
The normal anteroposterior diameter of the common bile duct in an adult should not
exceed:
A. 3 mm
B. 6 mm
C. 10 mm
D. 12 mm
Correct Answer: B
Explanation: The normal common bile duct measures up to 6 mm in adults, with an
additional 1 mm allowed per decade of life after age 60. Measurements exceeding these
values warrant investigation for obstruction or pathology.
Question 7
Which vascular structure courses posterior to the pancreas and anterior to the aorta?
A. Left renal vein
B. Splenic vein
C. Superior mesenteric artery
D. Inferior mesenteric vein
Comprehensive Practice Test — Abdominal Anatomy, Hepatobiliary
Imaging, Pancreas, Spleen, Urinary Tract, Vascular Structures &
Pathology — 190 Multiple-Choice Questions with Answers &
Detailed Rationales
SECTION 1: ANATOMY AND PHYSIOLOGY (Questions 1-30)
Question 1
Which anatomic structure serves as the primary landmark dividing the abdominal cavity into
supracolic and infracolic compartments?
A. Transverse mesocolon
B. Lesser omentum
C. Falciform ligament
D. Greater omentum
Correct Answer: A
Explanation: The transverse mesocolon anchors the transverse colon and separates the
supracolic compartment (stomach, liver, spleen) from the infracolic compartment. This
division is critical for understanding peritoneal spread patterns and fluid accumulation in
pathologic states.
Question 2
A patient presents with jaundice and right upper quadrant pain. Sonographic evaluation
reveals a dilated common bile duct measuring 10 mm. What is the most likely physiologic
explanation for this finding in a post-cholecystectomy patient?
,A. Normal compensatory dilation following gallbladder removal
B. Acute pancreatitis causing extrinsic compression
C. Choledocholithiasis obstructing the distal duct
D. Pancreatic pseudocyst compressing the biliary tree
Correct Answer: A
Explanation: Post-cholecystectomy patients may demonstrate mild compensatory common
bile duct dilation up to 10 mm due to loss of gallbladder reservoir function. This is a benign
finding that should not be confused with pathologic obstruction.
Question 3
The sonographic landmark known as the "Mickey Mouse" sign in the porta hepatis
represents which structures?
A. Common bile duct, hepatic artery, and portal vein
B. Right hepatic vein, middle hepatic vein, and left hepatic vein
C. Main portal vein, splenic vein, and superior mesenteric vein
D. Cystic duct, common hepatic duct, and common bile duct
Correct Answer: A
Explanation: The "Mickey Mouse" sign describes the portal triad in transverse section: the
portal vein forms the "face" with the common bile duct and hepatic artery as the "ears." This
landmark is essential for identifying biliary and vascular anatomy during abdominal
scanning.
Question 4
,Which sonographic feature best distinguishes the right hepatic vein from the right portal
vein?
A. The hepatic vein has a more echogenic wall
B. The portal vein demonstrates a pulsatile waveform
C. The hepatic vein walls are nearly imperceptible
D. The portal vein drains directly into the IVC
Correct Answer: C
Explanation: Hepatic veins lack the fibrofatty connective tissue sheaths that surround portal
veins, making their walls nearly invisible sonographically. Portal veins have echogenic walls
due to surrounding perivascular fibrous tissue, a key differentiator.
Question 5
A 45-year-old female presents with intermittent right flank pain. Sonography demonstrates a
duplicated collecting system on the right. Which embryologic structure failed to completely
regress?
A. Metanephric blastema
B. Ureteric bud
C. Pronephros
D. Mesonephric duct
Correct Answer: B
, Explanation: Duplicated collecting systems result from premature bifurcation of the ureteric
bud during embryogenesis. This anomaly predisposes patients to vesicoureteral reflux and
ureterocele formation, requiring careful evaluation of both moieties.
Question 6
The normal anteroposterior diameter of the common bile duct in an adult should not
exceed:
A. 3 mm
B. 6 mm
C. 10 mm
D. 12 mm
Correct Answer: B
Explanation: The normal common bile duct measures up to 6 mm in adults, with an
additional 1 mm allowed per decade of life after age 60. Measurements exceeding these
values warrant investigation for obstruction or pathology.
Question 7
Which vascular structure courses posterior to the pancreas and anterior to the aorta?
A. Left renal vein
B. Splenic vein
C. Superior mesenteric artery
D. Inferior mesenteric vein
