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Abscesses of different etiology, pyogenic or amoebic, may present different features due to the varying degree of liquefaction and location. Furthermore, vascularity depends on evolution stage; usually it is located at the periphery of the lesion, whereas liquefied areas are positioned in the central zone. Conventional US can demonstrate an inhomogeneous echo-structure with peripheral hyper-echoic aspects and central hypo-echoic features. Color Doppler may detect vascular signals at periphery or in the septa of the lesion. Contrast-enhanced ultrasound shows as described below (Catalano et al., 2005):
Tuberculosis is an uncommon liver infection which occurs in the miliary form. On conventional ultrasound single or multiple hypo-echoic, well-defined nodules spread throughout the liver are generally observed (Brauner et al., 1989; Levine 1990). Contrast-enhanced ultrasound reveals hypo-enhancing well-defined nodules, especially in the later phase. Clinical findings are mandatory for the diagnosis (Akhan and Pringot, 2002) and differentiation from hepatic metastases is necessary.
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