Efficacy of transarterial embolisation in patients with life-threatening spontaneous retroperitoneal haematoma.

AIM: To evaluate the technical and clinical success of embolisation in patients with life-threatening spontaneous retroperitoneal haematoma (SRH) and to assess predictors of clinical outcome. MATERIALS AND METHODS: Thirty patients (mean age: 71.9±9.8 years) with SRH underwent digital subtraction angiography (DSA). All patients received anticoagulant or antiplatelet medication or a combination of both at the time the SRH occurred. RESULTS: Pre-interventional computed tomography angiography (CTA) revealed active retroperitoneal bleeding in 28 of 30 (93.3%) patients. DSA identified active haemorrhage in 22 of 30 patients (73.3%). Twenty-nine of 30 (96.7%) patients underwent embolisation. n-Butyl-2-cyanoacrylate (NBCA) was used in 15 patients (51.7%), coils were used in 10 patients (34.5%), and both embolic agents were used in four patients (13.8%). The technical success rate was 100%. Pre-interventional haemoglobin levels increased significantly after embolotherapy from 70.9±16.1 g/l to 87±11.3 g/l (p<0.001), whereas partial thromboplastin time decreased from 58±38 to 30±9 seconds (p<0.001) after embolotherapy. The need for transfusion of concentrated red cells decreased from 3±2.2 to 1±1.1 units (p<0.001) after the intervention. Clinical success was achieved in 19 of 29 (65.5%) patients. No major procedure-related complications occurred. Seven patients (24.1%) died within 30 days after the procedure. CONCLUSION: Embolotherapy in patients with life-threatening SRH leads to a high technical success rate and is a safe therapeutic option. The clinical success rate was acceptable and influenced by pre-interventional coagulation status and by the amount of transfused concentrated red cells.

Feasibility of gadoxetate disodium-enhanced MR cholangiography in chronic cholestatic biliary disease.

AIM: To investigate the feasibility of gadoxetate disodium-enhanced magnetic resonance (MR) cholangiography in chronic obstructive cholestatic biliary disease in the clinical setting. MATERIALS AND METHODS: Twenty-three patients with dilated bile duct trees and ten volunteers underwent gadoxetate disodium-enhanced liver MR cholangiography and were enrolled in the present retrospective study. Gadoxetate disodium was given in a standardized manner as a bolus injection at a dose of 0.25 mmol/kg of body weight (0.1 ml/kg). Region of interest-based measurement of mean enhancement of the dilated bile ducts was performed in series before gadoxetate disodium administration and during hepatobiliary phases. RESULTS: Direct comparison of mean bile duct enhancement during hepatobiliary phases in the clinical imaging window between healthy volunteers [4.7 ± 2.2 arbitrary units (au)] and patients with dilated bile ducts (0.1 ± 0.3 au) revealed significantly lower or absent enhancement in dilated bile ducts (p = 0.001). CONCLUSION: Standard clinical gadoxetate disodium-enhanced MR cholangiography is not a reliable technique for the evaluation of the biliary trees, because of altered biliary gadoxetate disodium elimination in patients with chronic obstructive biliary diseases.

[Interventional treatment of the acute and subacute vena cava superior syndrome]. / Interventionelle Behandlung des akuten und subakuten Vena-cava-superior-Syndroms.

BACKGROUND: Superior vena cava syndrome is defined as the lack of central venous inflow through the superior vena cava and can present a life-threatening situation. The acute situation is characterized by dyspnea and requires a fast and effective treatment. METHODS: Using two case reports, endovascular stent therapy for the treatment of acute and subacute superior vena cava syndrome is explained and discussed. RESULTS: In the first case, we introduce a patient with acute dyspnea due to decompensation of a chronic thrombosis of the superior vena cava. The second case displayed the same acute symptoms consisting of acute dyspnea and upper venous congestion due to a tumor-related compression of the superior vena cava. In both cases, the acute situation of superior vena cava syndrome was successfully treated by stent implantation. CONCLUSION: Endovascular treatment of superior vena cava syndrome is an effective option with a high technical success rate.

[Laser ablation. Do we still need it?]. / Laserablation. Brauchen wir sie noch?

Laser ablation (LA) is momentarily the only invasive ablation procedure besides radiofrequency ablation (RFA) which can be performed entirely under magnetic resonance imaging (MRI) guidance. The long-term outcome and morbidity profiles are broadly identical for both modalities, excluding the RFA-specific prevalence for skin burns. The technical and logistic disadvantages of LA have been overcome since the introduction of miniaturized two-component applicators. The main advantage of LA is its superior MRI compatibility. Interference-free imaging during LA allows MR thermometric real-time therapy control without the need for RF filters. High-resolution thermometry in the target zone only makes sense without the extinction artifact of a metal probe and this condition is met only by the glass fibers of LA. An independent therapy monitoring is crucial in modern scenarios of oncologic quality management.

Accuracy of simple approaches to assessing liver volume in radiological imaging.

OBJECTIVES: The purpose of the study was to evaluate the accuracy of measured diameters and calculated volume indices for determining liver size and to derive a simple approach for estimating liver volume. METHODS: Three hundred twenty-nine volunteers (cohort A) were grouped according to liver volume: small (n = 109), medium (n = 110), and large (n = 110). True liver volume was determined by magnetic resonance imaging (MRI) using manual segmentation. Maximum diameters (maxdiam) of the liver and distances in midclavicular line (MCL) were measured. Volume indices were calculated as a simple product of the measured diameters. The calculated volume indices were calibrated to predict true liver volume. Performance of the calibrated method was evaluated in a control group (cohort B) including randomly selected volunteers (n = 110) and a patient group with histopathologically proven parenchymal liver diseases (n = 28). RESULTS: In cohort A, there was strong correlation between diameters and true liver volume (r s = 0.631-0.823). Calculated volume indices had slightly better correlation (maxdiam r s = 0.903, MCL r s = 0.920). A calibration index was calculated from the volumes and diameters determined in cohort A. Application of this calibration on cohort B verified a very strong correlation between calibrated volume indices and true liver volume (maxdiam r s = 0.920, MCL r s = 0.909). In addition, the low mean difference between predicted liver volume (maxdiam = -70.9 cm(3);MCL = -88.4 cm(3)) and true liver volume confirms that the calibrated method allows accurate assessment of liver volume. CONCLUSIONS: Both simple diameters and volume indices allow estimating liver size. A simple calibration formula enables prediction of true liver volume without significant expense.

[Laser-induced thermotherapy (LITT) of tumors of the liver in central location: results and complications]. / Laserinduzierte Thermotherapie (LITT) von Lebertumoren in zentraler Lokalisation: Ergebnisse und Komplikationen.

PURPOSE: To investigate whether laser-induced thermotherapy (LITT) for tumors of the liver in central location is a sufficient and safe therapeutic option. MATERIAL AND METHODS: According to predefined criteria, 23 of 136 patients were chosen to be treated with LITT because of malignant liver tumors. At the time of the first LITT, the patients had 28 central tumors (27 metastases, one HCC), which were treated in 34 sessions with 64 laser applications and had a clinical and imaging follow-up every 3 months. RESULTS: The primary effectiveness rate was 74.1% and the secondary effectiveness rate 82.1%. The mortality rate was 0%. Major complications occurred in one patient (hemorrhagic pleural effusion), while minor complications occurred in 10 patients. During the median follow-up of 20 months (range 3-57 months), local tumor progression developed in 22% of the tumors. The effectiveness rate was 78.6%, 71.4% and 64.3% after 3, 6 and 9 months. The median survival was 46.0 months (95% confidence interval: 28.6-47.1 months). CONCLUSION: In our patients, complications and ablation rate of laser-induced thermotherapy for central liver tumors do not differ from those in peripheral location as described in the literature.

[Modern treatment of an appendiceal mass]. / Moderne Therapie perityphlitischer Abszesse.

BACKGROUND: The recommendations for the treatment of an appendiceal mass are still controversial. The need for staged appendectomy is still under discussion. PATIENTS AND METHODS: In a retrospective study all patients with the diagnosis appendiceal mass (ICD 10 K35.32) treated in the surgical clinic of the University Clinic in Greifswald between June 1999 and June 2011 were analyzed. RESULTS: A total of 38 patients were included in the study whereby 17 patients (9 male and 8 female) were treated with drainage and antibiotics (group A) and 21 (14 male and 7 female) were treated by immediate surgery (group B). Nonsurgical therapy with drainage of the abscess was found to be efficient. Immediate surgical treatment was also effective and should be performed when signs of peritonitis exist. Interval appendectomy is not indicated.

[Thoracic aortic interventions]. / Intervention an der thorakalen Aorta.

The treatment of thoracic aortic diseases has undergone a paradigm shift due to the introduction and further development of interventional techniques in recent years. Thoracic endovascular aortic repair (TEVAR) of the descending aorta has significantly lower mortality and complication rates compared to open repair. Meanwhile this endovascular approach is the first option for the treatment of the majority of thoracic aortic diseases.

[Percutaneous thermoablation of lung metastases. Indication, performance, initial results, and imaging findings]. / Perkutane Laserablation von Lungenmetastasen. Indikation, technische Durchführung, erste Ergebnisse und Bildbefunde.

Not unlike thermoablation of liver metastases, thermoablation of metastases to the lungs is gaining clinical interest. Radiofrequency ablation and laser-induced interstitial thermotherapy are both used clinically. Initially it was suspected that percutaneous treatment of lung metastases would result in a rate of pneumothoraces and tissue reactions which would not be clinically acceptable. However, this did not prove true. Fear of pneumothoraces however did lead to the desire for an applicator with a maximally reduced diameter. While clinical results are not yet available, technical success rates of laser-induced interstitial thermotherapy of lung metastases are promising. The percentage of pneumothoraces does not differ significantly from that seen in diagnostic procedures. Large metastases may be treated by simultaneous use of multiple applicators or by repositioning of an applicator (pullback technique). Surgical experience is still guiding us in deciding which primaries' metastases may be successfully treated percutaneously. The literature indicates that lung metastases from colorectal primaries are especially suited. Radiotherapy is only an alternative method in cases of lung metastases if they cause symptoms (such as pain because of thorax infiltration or difficulty in breathing because of bronchial lesion). Due to the risk of radiation-induced pneumonia general radiotherapy is not to be recommended. The possibility of stereotactic ray treatment is being considered, but because breathing shifts the metastases it is not yet feasible. Therefore, percutaneous thermoablation could be used as a minimally invasive, rather riskless therapeutic option for a relatively high percentage of inoperable lung metastases.

[Percutaneous laser-induced thermotherapy of lung metastases: experience gained during 4 years]. / Perkutane laserinduzierte Thermotherapie von Lungenmetastasen: Erfahrungen nach 4-jähriger Anwendung.

We perform laser ablation of lung metastases for four years. In the following we report on technical success, ablation results and follow-up. 30 patients with a total of 42 lung metastases were treated. Patients were aged between 42 and 74 years. Primary tumors were mostly colorectal carcinomas, head and neck and uro-genital tumors. Technical success was achieved in 40, complete ablation in 14 metastases (33%); however, in 8 metastases follow-up was too short for a valid evaluation (4-8 weeks). Further analysis may improve the overall results: metastases located in the central parts of the lungs were more easily treated than those located peripherally, best results were achieved in metastases not larger than 3 cm, percutaneous ablation of lung metastases has potential as an additional therapeutic option if surgery is not possible.