ESR EuroSafe Imaging and its role in promoting radiation protection - 6 years of success.

This article introduces the European Society of Radiology's EuroSafe Imaging initiative in the year of its 6th anniversary. The European and global radiation protection frameworks are outlined and the role of the EuroSafe Imaging initiative's Call for Action in successfully achieving international radiation protection goals as set out by those frameworks is detailed.

Temporomandibular joint soft-tissue pathology, II: Nondisc abnormalities.

The most important objective in a magnetic resonance imaging (MRI) study of the temporomandibular joint (TMJ) is to determine the location of disk, because the presence of a displaced disk is a critical sign of TMJ dysfunction. However, a high frequency of disk displacement appears in asymptomatic volunteers; thus, other MRI indirect signs of TMJ dysfunction can help in the diagnosis. Further studies using the latest MRI techniques allow a better understanding of the sources of joint pain and the discrepancy between imaging findings and patient symptoms. Evaluation of other MRI signs such as the presence of joint effusion, the rupture of retrodiscal ligaments, or the thickness of the attachment of the external pterygoid muscle can be used as indirect early signs of TMJ dysfunction, before osteoarthritic changes lead to a more advanced stage of the dysfunctional spectrum. In this article we show those MRI indirect signs of TMJ dysfunction, providing more reasons to separate anatomic variants of healthy individuals from a real internal derangement.

Magnetic resonance of focal liver lesions in hepatic cirrhosis and chronic hepatitis.

Detection of focal liver nodules in patients with cirrhosis continues to be a radiologic challenge despite progressive advances in liver imaging in the past 2 decades. Patients with hepatic cirrhosis have a high predisposition to develop hepatocellular carcinoma (HCC), and the early detection and diagnosis of this tumor is very important because the most effective treatment is surgical resection, transplantation, or local ablation therapy when the tumor is small. Cirrhotic livers are mainly composed of fibrosis, together with a broad spectrum of focal nodular lesions ranging from regenerative nodules to premalignant dysplastic nodules to overt HCC. Awareness of such lesions and interpretation of imaging studies in these patients requires a critical review to detect subtle tumors, and a thorough understanding of the imaging appearance of the malignant and benign masses that can occur in the cirrhotic liver. Although the recent advances in liver imaging techniques, especially computed tomography (CT) and magnetic resonance (MR), have facilitated the detection and characterization of focal liver nodules in cirrhotic patients, discriminating between HCC and precancerous nodules remains problematic with all available imaging techniques. Nevertheless, MR imaging appears to have more potential than other imaging techniques in the study of cirrhotic patients and MR may be more appropriate than the other imaging modalities for the detection of small HCCs. In this article we review the imaging characteristics of nodular focal lesions that arise in cirrhotic livers, with special attention to MR imaging features.