Diagnostic Ultrasound - Abdomen and Pelvis

Focal Nodular Hyperplasia
(Left) Transverse abdominal
US shows an isoechoic FNH ſt
bulging from the lateral
segment of the left lobe of the
liver. (Right) Axial
hepatobiliary phase MR image
obtained 20 minutes after
gadoxetate injection in the
same patient shows an
exophytic FNH in the lateral
segment of left lobe of liver
ſt. The lesion retains contrast
to slightly greater degree than
the background liver due to
the presence of normal
hepatocytes and abnormal
bile ductules.
Diagnoses: Liver
(Left) Longitudinal
transabdominal US shows an
isoechoic FNH in the caudate
lobe of liver ſt. The mass
causes contour deformity and
mass effect upon the adjacent
gallbladder and portal vein
st. The lesion is difficult to
distinguish from the
surrounding liver, earning its
moniker "stealth lesion."
(Right) Power Doppler US in
the same patient shows that
the isoechoic FNH ſt contains
internal radiating vessels
with a spoke-wheel
configuration.
(Left) Transverse abdominal
US shows a large hypoechoic
FNH in the liver ſt with a
hyperechoic central scar .
(Right) Transverse power
Doppler US in the same
patient shows centrifugal
blood flow away st from the
central scar of FNH, giving
a spoke-wheel vascularity
pattern.
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