High-quality T2w imaging can be obtained with respiratory-triggered multi-shot RARE sequences and pre- and multiphase post-gadolinium imaging using rapid breath-hold 3D T1w volume imaging is now routine. Diffusion-weighted imaging (DWI) is increasingly used to improve liver lesion detection. MR-...
Calcification involves entire lesion Appears as a dense mass May produce artifacts on CT scans Echinococcus cysts have curvilinear or ring calcification Central water density in cyst Benign neoplasms Hemangiomas, especially large ones, may contain large, coarse calcifications; may be seen at CT in...
If a patient has a small (<3cm), smooth, and stable (if prior imaging is available) lesion, it is likely to be benign. Many such lesions can be fully characterized by ultrasound, but cross-sectional imaging is usually definitive. Patients with cirrhosis (or hepatitis B) or known (or sus...
The imaging features that are evaluated include internal characteristics, such as a cystic or solid appearance; the presence of hemorrhage or fibrosis; the identification of internal calcifications; and the presence or absence of a capsule. Other lesion-specific traits discussed include tumor vascularity...
Plain radiograph calcification is almost never present. On occasion, a pedunculated FNH lesion may project to the margin of the liver and compress the adjacent stomach or hepatic flexure. Nuclear Medicine In the past, sulfur colloid scintigraphy was the preferred imaging technique in the diagnosis...
Also, the patient underwent a computed tomography (CT) scan which demonstrated lesion calcification ( Fig. 2). Percutaneous biopsy of the lesion was considered unsafe because of its deep position and poor visualization with ultrasound imaging. Although transjugular liver biopsy is usually only ...
Calcification is observed in 10% to 20% of cases.5 After intravenous administration of contrast material, both arterial phase and portal venous phase CT scans show early, peripheral, globular enhancement of the lesion. The attenuation of the peripheric nodules is equal to that of aorta.17,18 ...
Solitary necrotic nodule of the liver misintrepreted as malignant lesion: considerations on two cases. J Surg Oncol 2000;74(suppl):219–22. Robinson PJ, Arnold P, Wilson D. Small “indeterminate” lesions on CT of the liver: a follow-up study of stability. Br J Radiol 2003;76:866–...
To perform a dual-contrast protocol, we injected the agents at different times so that the first contrast agent visualized the portal phase and the second the arterial phase, both of which are mandatory for liver lesion characterization. We demonstrated a sensitive discrimination and quantification ...
and neoplasia. Nodular hyperplasia is a benign lesion of decreased or increased echogenicity and is a common incidental finding. Focal changes may be seen with either metastatic or primary neoplastic infiltration, and they cannot be differentiated with certainty from benign lesions (Figure 2-8,ItoP)...