European journal of radiology
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The aim of this study was to investigate the clinical utility of sequential imaging of hepatocellular carcinoma (HCC) by contrast-enhanced power Doppler ultrasonograpy (CE-PDUS) to differentiate hepatocellular carcinoma from adenomatous hyperplasia (AH) and regenerated nodule (RN) and to predict the degree of differentiation of HCC. Fifty-one patients with 62 hepatic lesions including 33 moderately and poorly differentiated HCCs, 19 well-differentiated HCCs, seven AHs and three large RNs were examined by CE-PDUS. The imaging patterns during early arterial phase (tumor vessel image), late vascular phase (tumor perfusion image) and post-vascular phase (liver perfusion image) were classified as diffuse, basket, peripheral, central and no enhancement; as whole tumor, partial tumor and no enhancement; as whole tumor, partial tumor and no defect, respectively. ⋯ The basket pattern in the tumor vessel image and the partial defect pattern in the tumor perfusion image were observed in HCCs only. All AH/RNs showed no defect pattern in the liver perfusion image. The sequential imaging of HCC during early arterial, late vascular and post-vascular phases by CE-PDUS is clinically useful to differentiate HCC from AH/RN and to predict the degree of differentiation of HCC.
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Computed tomography (CT) virtual bronchoscopy is a noninvasive technique that provides an internal view of trachea and major bronchi by three-dimensional reconstruction. The aim of this study was to investigate the usefulness of virtual bronchoscopy in the evaluation of suspected foreign body aspiration in children. ⋯ Helical CT scanning with virtual bronchoscopy should be performed in only selected cases with suspected foreign body aspiration. When the chest radiograph is normal and the clinical diagnosis suggests aspirated foreign body, helical CT and virtual bronchoscopy can be considered in order to avoid needless rigid bronchoscopy.