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The influence of the interventional treatment approach for transarterial radioembolization (TARE) on the incidence of extrahepatic microsphere depositions and to angiographic complications was evaluated. In total, 398 TARE cycles were analyzed. Interventional treatment approaches were classified as single treatment position (TP) with interventional occlusion (IO), multiple TPs without IO, and multiple TPs with IO. Correlations with extrahepatic microsphere depositions, angiographic complications, and periprocedural clinical events were performed. Alternative treatment strategies were evaluated. Applications from multiple TPs could have ensured the safe application of microspheres in 48.2% of cases that were originally performed from a single TP after IO. Extrahepatic microsphere accumulations were detected after 5.2%, 5.3%, and 1.5% of TARE procedures from a single TP without IO, a single TP with IO, and multiple TPs without IO, respectively. Applications from multiple TPs did not increase angiographic complications. During the 30-day follow-up, nausea/vomiting and upper abdominal discomfort were observed more frequently in the group with IO than in the group without IO (7.9%/4.6% and 9.2%/5.9%, respectively). In many TARE procedures, the same target liver can be treated from multiple TPs instead of a single TP, reducing the need for the interventional occlusion of aberrant arteries and potential extrahepatic microsphere depositions.

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With the increasing use of next-generation sequencing, highly effective targeted therapies have been emerging as treatment options for several cancer types. Recurrent gene-fusions have been recognized in sarcomas; however, options for targeted therapy remain scarce. Here, we describe a case of a sarcoma, associated with a RET::TRIM33-fusion gene with an exceptional response to a neoadjuvant therapy with the selective RET inhibitor selpercatinib. Resected tumor revealed subtotal histopathologic response. This is the first report of successful targeted therapy with selpercatinib in RET-fusion-associated sarcomas. As new targeted therapies are under development, similar treatment options may become available for sarcoma patients.

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BACKGROUND: Practical courses in undergraduate medical training often lack a didactic concept. Active participation and learning success largely depend on chance. This study was initiated to evaluate a novel concept of structured work-based learning (WBL) in the course of students' half-day radiology immersion experience (IE). METHODS: This prospective, single-centre cohort study included 228 third-year students of the 2019 summer semester who underwent the obligatory radiology IE at a university hospital. The course was based on a novel structured WBL concept that applied established didactic concepts including blended learning, the FAIR principles of feedback, activity, individualization, and relevance, and Peyton's four-step approach. Outcomes of equal weight were student and supervisor satisfaction with the clinical radiology IE assessed by paper-based- and online survey, respectively. Secondary outcome was achievement of intended learning outcomes assessed by means of mini clinical evaluation exercises and personal interviews. RESULTS: Satisfaction with structured WBL was high in 99.0% of students. Students' expectations were exceeded, and they felt taken seriously at the professional level. Dissatisfaction was reasoned with quality of learning videos (0.6%), little support by supervisors (0.5%), or inadequate feedback (0.6%). Supervising resident physicians rated achievement of intended learning outcomes regarding cognitive and psychomotor competences as excellent for all students. Personal interviews revealed achievement of affective competence in some students. Twelve of 16 (75.0%) supervising physicians were satisfied with focussing on intended learning outcomes and student preparation for IE. Two of 15 (13.3%) supervisors were unsatisfied with time spent, and 4 of 16 (25%) with the approach of assessment. CONCLUSIONS: This study demonstrated that both students and supervisors were satisfied with the novel concept of structured WBL within the scope of clinical radiology IE. Achievement of intended learning outcomes was promising.

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BACKGROUND: This study aimed to investigate performance, effectiveness, and safety of excimer laser atherectomy for the treatment of complex lower limb artery disease in a real-world setting. METHODS: In our prospective, multicenter registry, consecutive patients with complex lower limb lesions underwent excimer laser atherectomy with optional standard balloon angioplasty, paclitaxel-coated balloon angioplasty, and bailout stenting. Primary outcome was technical success. Secondary outcomes were device performance of the excimer laser system, freedom from target lesion revascularization (TLR), peri-procedural complications, and amputation-free survival in patients with critical limb ischemia (CLI). RESULTS: A total of 294 patients were enrolled at 14 European centers (mean lesion length 109±103 mm, total occlusions 56.8% [167 of 294 lesions], CLI 47.3% [132 of 279 patients]. Adjuvant balloon angioplasty was conducted in 283 (96.3%), and complementary stent implantation in 98 patients (33.3%). Technical success was achieved in 95.3% of patients. Increasing lesion length was associated with decreased laser atherectomy performance (odds ratio [OR] per 10 mm: 0.94 [95% confidence interval [CI] 0.90 to 0.99], P=0.01). A total of 66 patients (22.4%) completed the 12-month follow-up. Freedom from TLR was 83.5% (95% CI: 74.9 to 92.1) at 12 months. Chronic total occlusions were associated with more TLR (OR 5.03 [95% CI: 1.01 to 25.1], P=0.049). Amputation -free survival in patients with CLI was 93.1% (95% CI: 83.9 to 100). CONCLUSIONS: Excimer laser atherectomy substantially contributed to technical success of endovascular treatment of complex infra-inguinal lesions. Freedom from 12-month TLR was reasonable.

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BACKGROUND: Computed tomography (CT) is a central modality in modern radiology contributing to diagnostic medicine in almost every medical subspecialty, but particularly in emergency services. To solve the inverse problem of reconstructing anatomical slice images from the raw output the scanner measures, several methods have been developed, with filtered back projection (FBP) and iterative reconstruction (IR) subsequently providing criterion standards. Currently there are new approaches to reconstruction in the field of artificial intelligence utilizing the upcoming possibilities of machine learning (ML), or more specifically, deep learning (DL). METHOD: This review covers the principles of present CT image reconstruction as well as the basic concepts of DL and its implementation in reconstruction. Subsequently commercially available algorithms and current limitations are being discussed. RESULTS AND CONCLUSION: DL is an ML method that utilizes a trained artificial neural network to solve specific problems. Currently two vendors are providing DL image reconstruction algorithms for the clinical routine. For these algorithms, a decrease in image noise and an increase in overall image quality that could potentially facilitate the diagnostic confidence in lesion conspicuity or may translate to dose reduction for given clinical tasks have been shown. One study showed equal diagnostic accuracy in the detection of coronary artery stenosis for DL reconstructed images compared to IR at higher image quality levels. Consequently, a lot more research is necessary and should aim at diagnostic superiority in the clinical context covering a broadness of pathologies to demonstrate the reliability of such DL approaches. KEY POINTS: · Following iterative reconstruction, there is a new approach to CT image reconstruction in the clinical routine using deep learning (DL) as a method of artificial intelligence.. · DL image reconstruction algorithms decrease image noise, improve image quality, and have potential to reduce radiation dose.. · Diagnostic superiority in the clinical context should be demonstrated in future trials.. CITATION FORMAT: · Arndt C, Güttler F, Heinrich A et al. Deep Learning CT Image Reconstruction in Clinical Practice. Fortschr Röntgenstr 2021; 193: 252 - 261.

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PURPOSE: To assess radiation exposure in men undergoing prostate artery embolization (PAE) for the treatment for symptomatic, benign prostatic hyperplasia depending on growing experience of interventional radiologists over a 4-year period. METHODS: A total of 250 consecutive patients underwent PAE at a single center. Data on radiation exposure [dose area product (DAP), effective dose (ED), entrance skin dose (ESD), and fluoroscopy time (FT)] were retrospectively evaluated. Primary outcomes of interest were patient radiation exposure in five consecutive groups of 50 patients each and Pearson correlation with the number of patients treated. RESULTS: Median DAP, ED, and ESD during prostate artery embolization were significantly higher in the first compared to the second 50 patients (56 298 µGym2 vs. 24 709 µGym2, p < 0.001, 146.4 mSv vs. 64.2 mSv, p < 0.001, and 5.1 Gy vs. 2.4 Gy, p < 0.001, respectively). The following consecutive groups did not differ significantly from the respective preceding group in terms of DAP, ED, and ESD. Number of digital subtraction angiography series, FT, and procedure time decreased with increasing operator experience (Pearson's r = - 0.240, p < 0.001, r = - 0.269, p < 0.001, and r = - 0.504, p < 0.001, respectively). Bilateral prostate artery embolization was associated with less ESD and shorter FT than unilateral embolization (median 2.5 vs. 3.5 Gy, p = 0.02, and 26 min vs. 42 min, p < 0.001, respectively). CONCLUSION: Exposure to radiation in men who underwent PAE decreased with growing operator experience and decreasing complexity of procedures.

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True visceral artery aneurysms (VAA) and visceral artery pseudoaneurysms (VAPA) are located in the celiac trunk, the superior mesenteric artery and inferior mesenteric artery. In addition to surgical treatment, endovascular embolisation therapy of visceral aneurysms and pseudoaneurysms is an alternative interventional method that has developed precipitously over the last two decades and is considered a first-choice method in many centres. The procedure is characterised by a high technical success rate with a low complication rate. This article presents the basic principles of endovascular treatment and discusses the indications and limitations of the procedure.

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