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Journal of Ultrasound in Medicine, Vol 18, Issue 11 737-743, Copyright © 1999 by American Institute of Ultrasound in Medicine
Limitations of characterization of hepatic hemangiomas using a sonographic contrast agent (Levovist) and power Doppler ultrasonography
T. K. Kim, J. K. Han, A. Y. Kim and B. I. Choi
Department of Radiology and Institute of Radiation Medicine, Seoul National University College of Medicine, Korea.
Power Doppler ultrasonography using a sonographic contrast agent (Levovist)
was evaluated in 20 patients with hepatic hemangiomas with a 2-4 MHz convex
transducer according to a standardized examination protocol (pulse
repetition frequency, 1000 Hz; medium wall filter; power Doppler gain, 50
to 85%). Enhancement patterns were assessed and were compared with those on
dynamic magnetic resonance imaging (n = 11) or computed tomography (n = 9).
The most common enhancement pattern was dotlike or linear enhancement
located predominantly at the periphery of the tumor (15 cases, 75%).
Diffuse homogeneous enhancement was seen in one case (5%). No definite
contrast enhancement was evident in four cases (20%). The enhanced area on
ultrasonograms was smaller than that on dynamic MR images or CT scans in 18
cases (90%). A transient centripetal fill-in pattern was identified in six
cases (30%). Persistent enhancement until 300 s was not seen in any case.
Therefore, specific diagnosis of hemangioma with power Doppler
ultrasonography and contrast agent may not be possible.
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