The diagnostic performance of contrast-enhanced ultrasound (CEUS) for evaluating hepatocellular carcinoma (HCC) juxtaposed to MRI findings; a retrospective single-center analysis of 292 patients

BACKGROUND

HCC is the most frequent primary liver cancer entity. Major risk factors comprise chronic HBC and HCV infections, ALD or NAFLD. Apart from the anamnesis, the clinical examination and serologic analysis, an essential part of the diagnostic HCC work-up is due to imaging findings from sonography, CT or MRI scans. HCC lesions feature a distinct vascularization pattern: hyperenhancement during early arterial and hypoenhancement/wash-out during portal venous or delayed phases. CEUS facilitates dynamic assessment of microperfusion patterns of suspicious liver lesions.

PURPOSE

The purpose of the present retrospective single-center study was to determine the diagnostic value of CEUS for assessing HCC by comparison with findings from MRI scans.

MATERIALS AND METHODS

Between 2004-2018 292 patients with suspicious liver lesions underwent CEUS and MRI. All patients underwent native B-mode, Color Doppler and CEUS after given informed consent. The applied contrast agent was a second-generation blood pool agent (SonoVue®, Bracco, Milan, Italy). Every CEUS examination was performed and interpreted by a single experienced radiologist (EFSUMB Level 3).

RESULTS

CEUS was performed on all included patients without occurrence of any adverse effects. CEUS showed a sensitivity of 96%, a specificity of 91%, a PPV of 95% and a NPV of 94% for analyzing HCC in comparison with MRI as the diagnostic gold standard.

CONCLUSION

With a distinguished safety profile CEUS shows a high diagnostic accuracy in assessing HCC compared to corresponding results from MRI scans.

Contrast-enhanced ultrasound (CEUS) in the diagnostic evaluation of popliteal artery aneurysms, a single-center study

BACKGROUND

Popliteal artery aneurysms (PAA) are the most common peripheral artery aneurysms. Most common cause is arteriosclerosis. Acute thromboembolic limb ischemia and rupture of the PAA depict severe complications. Diagnostic tools for identifying PAAs are (Doppler) ultrasound, CT/MR angiography and DSA.

PURPOSE

The aim of the present retrospective single-center study is to assess the application and safety of CEUS for assessing untreated and treated PAAs.

MATERIALS AND METHODS

13 patients were included in this study on whom CEUS was performed between 2007-2016. CEUS examinations were performed and interpreted by an experienced single radiologist (EFSUMB Level 3).

RESULTS

CEUS allowed for the detection of PAAs in all cases. CEUS allowed for detection of partial thrombosis of PAA in 7/8 of untreated patients, proper exclusion of PAA upon femoro-popliteal bypass in 3 patients, incomplete exclusion of PAA upon femoro-popliteal bypass in 1 patient and ruling out of in-stent stenosis in 1 patient.

CONCLUSION

CEUS is a useful and safe tool for in real-time evaluation of PAAs in the pre-/post-treatment status. In addition to conventional (Doppler) ultrasound and as an alternative tool to more elaborate imaging modalities, CEUS might be integrated in the future diagnostic work-up and follow-up of PAA patients.

[Acute abdomen - gastrointestinal causes]

CLINICAL/METHODICAL ISSUE

Diagnostic imaging plays a crucial role in the assessment and stratification of pathologic conditions causing acute abdomen. This report provides information on etiology, clinical manifestations and therapeutic options for six common diseases resulting in acute abdomen-appendicitis, cholecystitis, bowel obstruction, diverticulitis, acute pancreatitis, and viscus perforation.

PERFORMANCE

Besides initial ultrasound, CT scans often represent the imaging gold standard for the diagnostic evaluation of acute abdomen.

PRACTICAL RECOMMENDATIONS

Depending on the underlying pathologic condition, sonography or CT is suitable for the stratification of the gastrointestinal disease causing acute abdomen.

[Delineating Concept for Defining the Country Practitioner - - An Objective Approach for Implementation in the Field of Health Services Research]

In the context of the scientific discussions on health care research, a concrete and uniform definition of a country practitioner is still lacking. This would be essential, however, for the future design of the medical care structure in Germany. In particular, the ongoing discussions on the predicted shortage of physicians in rural and mostly economically undeveloped regions - a shortage that is already affecting parts of Germany - suggest the need for clarification of the concept of a country practitioner. Only on the basis of a uniform definition does it seem possible to develop and discuss effective solutions across regions and to be able to use them in a targeted manner. The multitude of existing approaches to solutions, which include, among others, telemedicine, health centres, community nurses, outpatient care services being undertaken by hospitals, and youth development, must be evaluated and adapted to actual needs. The article presents a newly developed multi-stage plan for the differentiation between rural and urban doctors, which enables the definition of "country practitioner" to be adapted according to the region. With the aid of the definition, a review and further development of the aforementioned approaches to solutions can take place. Moreover, by applying the concept of delineation, there is an opportunity to create completely new ideas and solutions in the context of health services research. The basis of the new approach to rural and urban medical delineation essentially consists of the following delineation steps: basic centre (Step I), rural settlement (Step II) and central geographic location (Step III). In the following, these 3 successive delineation steps are first separately and theoretically derived. Thereafter, the presented concept is applied to the region of Westphalia-Lippe. The developed model collectively offers a standardized approach that is feasible from a temporal and financial perspective. The primary aim of this paper is to contribute to the ongoing discussion on outpatient care research and, in particular, to the definition of the country practitioner. Using the model approach presented here, this definition also enables comparisons to be made between different regions of Germany.