A reliable risk score for stage IV esophagogastric cancer.

BACKGROUND: The role of surgery for patients with metastatic esophagogastric adenocarcinoma (EGC) is not defined. The purpose of this study was to define selection criteria for patients who may benefit from resection following systemic chemotherapy. METHODS: From 1987 to 2007, 160 patients presenting with synchronous metastatic EGC (cT3/4 cNany cM0/1 finally pM1) were treated with chemotherapy followed by resection of the primary tumor and metastases. Clinical and histopathological data, site and number of metastases were analyzed. A prognostic score was established and validated in a second cohort from another academic center (n = 32). RESULTS: The median survival (MS) in cohort 1 was 13.6 months. Significant prognostic factors were grading (p = 0.046), ypT- (p = 0.001), ypN- (p = 0.011) and R-category (p = 0.015), lymphangiosis (p = 0.021), clinical (p = 0.004) and histopathological response (p = 0.006), but not localization or number of metastases. The addition of grading (G1/2:0 points; G3/4:1 points), clinical response (responder: 0; nonresponder: 1) and R-category (complete:0; R1:1; R2:2) defines two groups of patients with significantly different survival (p = 0.001) [low risk group (Score 0/1), n = 22: MS 35.3 months, 3-year-survival 47.6%); high risk group (Score 2/3/4) n = 126: MS 12.0 months, 3-year-survival 14.2%]. The score showed a strong trend in the validation cohort (p = 0.063) [low risk group (MS not reached, 3-year-survival 57.1%); high risk group (MS 19.9 months, 3-year-survival 6.7%)]. CONCLUSION: We observed long-term survival after resection of metastatic EGC. A simple clinical score may help to identify a subgroup of patients with a high chance of benefit from resection. However, the accurate estimation of achieving a complete resection, which is an integral element of the score, remains challenging.

Bone mineral density measurements of the proximal femur from routine contrast-enhanced MDCT data sets correlate with dual-energy X-ray absorptiometry.

OBJECTIVES: To evaluate the utility of femoral bone mineral density (BMD) measurements in routine contrast-enhanced multi-detector computed tomography (ceMDCT) using dual-energy X-ray absorptiometry (DXA) as the reference standard. METHODS: Forty-one patients (33 women, 8 men) underwent DXA measurement of the proximal femur. Subsequently, transverse sections of routine ceMDCT of these patients were used to measure BMD of the femoral head and femoral neck. The MDCT-to-DXA conversion equations for BMD and T-score were calculated using linear regression analysis. The conversion equations were applied to the MDCT data sets of 382 patients (120 women, 262 men) of whom 74 had osteoporotic fractures. RESULTS: A correlation coefficient of r = 0.84 (P < 0.05) was calculated for BMD(MDCT) values of the femoral head and DXA T-scores of the total proximal femur using the conversion equation T-score = 0.021 × BMD(MDCT) - 5.90. The correlation coefficient for the femoral neck was r = 0.79 (P < 0.05) with the conversion equation T-score = 0.016 × BMD(MDCT) - 4.28. Accordingly, converted T-scores for the femoral neck in patients with versus those without osteoporotic fractures were significantly different (female, -1.83 versus -1.47; male, -1.86 versus -1.47; P < 0.05). CONCLUSION: BMD measurements of the proximal femur were computed in routine contrast-enhanced MDCT and converted to DXA T-scores, which adequately differentiated patients with and without osteoporotic fractures.

[Pitfalls in computed tomography for diffuse liver diseases]. / Pitfalls in der CT bei diffusen Lebererkrankungen.

CLINICAL/METHODICAL ISSUE: Misinterpretations in liver diagnostics could result in a false diagnosis, such as a parenchymatous damage or a false focal lesion. STANDARD RADIOLOGICAL METHODS: Computed tomography is a widely used diagnostic tool to visualize liver diseases. METHODICAL INNOVATIONS: Magnetic resonance imaging (MRI) is often used as a second diagnostic test to answer specific questions. PERFORMANCE: The more the condition of changes in liver parenchyma appearance in cross-sectional imaging is known the fewer mistakes will be made in the interpretation. Knowledge of these pitfalls helps to increase diagnostic accuracy. ACHIEVEMENTS: Magnetic resonance imaging could help to depict most of the pitfalls. PRACTICAL RECOMMENDATIONS: By looking at diffuse or focal liver diseases radiologists should be aware of perfusion patterns and structural changes of the liver parenchyma to make a correct diagnosis.

[Endoscopic and percutaneous intervention in the long-term treatment of benign biliary stenosis. A 71-year-old patient with cholestasis following radiotherapy]. / Endoskopische und perkutane Interventionen in der Langzeitbehandlung benigner Gallengangstenosen : 71-jähriger Patient mit Cholestase nach Radiatio.

Benign biliary stenosis can have various causes and requires differentiation from disorders caused by malignant disease. Treatment of benign stenosis is often difficult and includes treatment modalities such as endoscopic, percutaneous or surgical interventions. Exact knowledge of the etiology and localization of the stenosis is essential when selecting the appropriate method of treatment. Here we present the case of a 71-year-old patient admitted to our hospital with cholangitis 13 years after undergoing radiotherapy of the renal bed due to hypernephroma of the right kidney. The patient was diagnosed with common bile duct stenosis due to the secondary effects of radiation, which is rarely reported in the literature. Our case covers a total treatment period of 15 years, enabling us to also discuss a viable sequence of treatment modalities in the treatment of benign bile duct stenosis.

Comparison of 3'-deoxy-3'-[¹8F]fluorothymidine positron emission tomography (FLT PET) and FDG PET/CT for the detection and characterization of pancreatic tumours.

PURPOSE: Despite recent advances in clinical imaging modalities, differentiation of pancreatic masses remains difficult. Here, we tested the diagnostic accuracy of molecular-based imaging including 3'-deoxy-3'-[(18)F]fluorothymidine (FLT) positron emission tomography (PET) and [(18)F]fluorodeoxyglucose (FDG) PET/CT in patients with suspected pancreatic masses scheduled to undergo surgery. METHODS: A total of 46 patients with pancreatic tumours suspicious for malignancy and scheduled for resective surgery were recruited prospectively. In 41 patients, FLT PET and FDG PET/CT scans were performed. A diagnostic CT performed on a routine basis was available in 31 patients. FLT PET and FDG PET/CT emission images were acquired according to standard protocols. Tracer uptake in the tumour [FDG and FLT standardized uptake value (SUV)] was quantified by the region of interest (ROI) technique. For FDG PET/CT analysis, correct ROI placement was ensured via side-by-side reading of corresponding CT images. RESULTS: Of 41 patients, 33 had malignancy, whereas 8 patients had benign disease. Visual analysis of FDG and FLT PET resulted in sensitivity values of 91% (30/33) and 70% (23/33), respectively. Corresponding specificities were 50% (4/8) for FDG PET and 75% (6/8) for FLT PET. In the subgroup of patients with contrast-enhanced CT (n = 31), sensitivities were 96% (PET/CT), 88% (CT alone), 92% (FDG PET) and 72% (FLT PET), respectively. Mean FLT uptake in all malignant tumours was 3.0 (range SUV(max) 1.1-6.5; mean FDG SUV(max) 7.9, range 3.3-17.8; p < 0.001). CONCLUSION: For differentiation of pancreatic tumours, FDG PET and FDG PET/CT showed a higher sensitivity but lower specificity than FLT PET. Interestingly, visual analysis of FLT PET led to two false-positive findings by misinterpreting physiological bowel uptake as pathological FLT uptake in the pancreas. Due to the limited number of patients, the clinical value of adding FLT PET to the diagnostic workup of pancreatic tumours remains to be determined.

Step and shoot coronary CT angiography using 256-slice CT: effect of heart rate and heart rate variability on image quality.

OBJECTIVE: To evaluate the effect of heart rate variability (HRV) and heart rate (HR) on intra-image "motion" and inter-image "stairstep" artefacts in step-and-shoot coronary CT angiography (CCTA) using a wide detector CT scanner. METHODS: 66 patients underwent step-and-shoot CCTA using 256-slice CT. Patients were divided into two groups (Group 1: HR <65 bpm, Group 2 ≥65bpm). Motion artefacts were quantified using a 5-point-scale. Stairstep artefacts were defined by measurements of misalignment. Image noise, contrast-to-noise-ratio (CNR), signal-to-noise-ratio (SNR), and radiation dose were assessed. RESULTS: Mean HR was 66 ± 16.7 bpm (range: 45-125 bpm) and mean HRV was 10.7 ± 17.5 bpm. A significant correlation between HR and stairstep artefacts (r = 0.46, p < 0.001) and motion artefacts (r = 0.63, p < 0.001) was found. Group 2 showed significantly increased step artefacts with a mean misalignment of 1.4 mm compared to 0.4 mm in Group 1 (p < 0.001). There was no significant effect of HRV on stairstep artefacts (r = 0.15, p = 0.416) and motion artefacts (r = 0.13, p = 0.311). No significant differences in image noise, CNR, SNR, and radiation dose were seen. CONCLUSIONS: Unlike CCTA using narrow CT detectors, HRV has no significant effect on motion and stairstep artefacts using a wide CT detector with high z-coverage. However, a higher HR still increases stairstep and motion artefacts.

[Preoperative CT angiography for planning free perforator flaps in breast reconstruction]. / Präoperative CT Angiografie zur Planung freier Perforans-Lappenplastiken (DIEP-Flaps) zur Brustrekonstruktion.

Preoperative Doppler ultrasonography for planning free perforator flaps is widely established to identify preoperatively perforators. The method allows one to localise the penetrating point of the perforator through the abdominal fascia. By this means it is not possible to see the intramuscular course or the position of the perforator in relation to the inferior epigastric artery. Lately the technique of computed tomographic angiography provides an opportunity for visualising the course of perforator vessels in these tissues. This paper summarises our experience with the preoperative CT angiography in our breast centre. Since spring 2009 we have reconstructed the breasts of 44 female patients by using free flaps from the lower abdominal wall. 6 of these were bilateral. In a total number of 50 breast reconstructions we used 23 deep inferior epigastric perforator (DIEP) flaps and 27 muscle-sparing transverse rectus abdominis muscle (TRAM) flaps. In addition to the preoperative ultrasonography, a CT angiography of the lower abdomen was conducted in 29 patients. On average they showed at least 2 perforators on the left as well as right abdominal sides, which could be used as flap vessels based on their signal intensity. Based on their estimated microsurgical dissection complexity, the perforator vessels could be classified into 3 groups: 1) direct perforators of category A with short intramuscular course (39%), 2) perforators with long intramuscular course of category B (50%) and 3) "turn around" perforators of category C, which pass medially around the rectus abdominis (11%). The technique of CT angiography permits a reliable preoperative visualisation of perforators in their entire course and facilitates the selection of the supplying perforator as well as the intraoperative procedure for the surgeon. The suggested classification of perforators into 3 groups simplifies the preoperative assessment of the microsurgical dissection effort. Compared to the commonly used Doppler ultrasonography there are disadvantages like the additional cost factor and the radiation exposure. However, in our experience the more detailed planning increases the safety of flap raising and reduces surgery time, so that we consider CT angiography a positive tool to facilitate free perforator flaps.

[The "invisible" foreign body]. / Der "unsichtbare" Fremdkörper.

A 58-year-old female patient fell down a stairs carrying a plant pot. The bamboo stem penetrated the left lower lip and remained stuck in the throat. The patient pulled the bamboo stem out immediately. The lower lip was sutured and a tear in the mucous membrane in the tonsils was explored and cleansed. A foreign body could not be detected either clinically or by computed tomography (CT) of the neck. After 1 week a control CT of the neck was carried out because the patient complained of odynophagy and a putrid taste. An initially overlooked foreign body was now detected in the "lung window" and lay in an abscess cavity on the prevertebral surface. The foreign body was surgically removed with the patient under narcosis and there were no aftereffects.

Noninvasive therapy of incidental de novo renal cell carcinoma in a kidney allograft 12 years after transplantation: report of a case and review of literature.

BACKGROUND: Immunosuppressive therapy increases the incidence of posttransplantation cancer. Primary renal cell carcinoma (RCC) represents 4.6% of all cancers in transplant recipients. The treatment options for RCC in a renal allograft include radical nephrectomy or nephron-sparing surgery. We report the case of a patient who underwent percutaneous radiofrequency ablation (RFA) of a RCC in the grafted kidney. PATIENT AND METHODS: Twelve years after undergoing heterotopic, allogenic kidney transplantation, a de novo lesion was diagnosed in the upper pole of the kidney graft in a 77-year-old patient during routine duplex ultrasonography. The magnetic resonance image showed a spherical lesion of 17 mm in diameter, which undoubtedly showed radiological signs of a RCC. After adequately informing the patient about alternative treatment strategies and the associated risks, we made an interdisciplinary decision for a percutaneous RFA of the lesion. RESULTS: After the intervention, graft function remained unchanged and is still good at 6 months with no signs of local recurrence on follow-up MRI. A small coagulation defect at the site of the former lesion was the only morphological change. There was also no evidence of distant tumor spread. CONCLUSION: Percutaneous RFA seems an acceptable, allograft-preserving treatment option associated with low morbidity and mortality for RCC in a renal allograft considering the significant risks associated with open partial nephrectomy in a kidney graft.

[Focal nodular liver lesions associated with a congenital portocaval shunt in an adult woman]. / Unklare Leberrundherde bei angeborenem portokavalem Shunt einerjungen Patientin.

The Abernethy malformation is a rare anomaly with partial or complete congenital absence of the portal vein and subsequent development of extrahepatic portocaval shunts. Diagnosis is usually made in childhood following the finding of liver neoplasms combined with slightly increased liver enzymes. There is a female predominance. Further findings are malformations of the heart, skeletal system and kidneys. Short-term follow-up of the liver lesions is recommended. Progressive disease can be treated by partial liver resection or transplantation. Diagnosis of the Abernethy malformation is based on various imaging modalities. We report the MRI and MRA findings of an Abernethy malformation in a 35-year-old woman with multiple liver cell adenomas and review the 32 previously published cases.

Detection of osteoporotic vertebral fractures using multidetector CT.

INTRODUCTION: Goals were to compare the performance of lateral radiographs and sagittal reformations (SR) of axial computed tomography (CT) datasets in identification of osteoporotic vertebral fractures and to assess for optimal slice thickness in axial CT datasets needed for reliable classification of these fractures. METHODS: Sixty-five vertebrae were harvested from 21 human cadaver spines and examined with a 64-row multidetector CT scanner. Axial images were acquired with a slice thickness of 0.6, 1, 2, 3 and 5 mm and SR were obtained using these datasets. In addition, specimens were radiographed in antero-posterior and lateral orientation. Vertebrae visualized in the different image datasets were separately graded by four radiologists according to the spinal fracture index (SFI) classification. Fracture status determined in a consensus reading of interactive reformations of the 0.6-mm CT dataset in all three dimensions served as a standard of reference in combination with pathological examinations. RESULTS: The average agreement for the 0.6-mm SR obtained between each radiologist and standard of reference for the grading of the fractures was very good (kappa=0.81). It was good for the 1-, 2- and 3-mm SR (kappa=0.70, 0.69 and 0.64), but only moderate for the radiographs (kappa=0.52), and fair for the 5-mm SR (kappa=0.33). When focusing only on detection of fractures, independent of the grading, all kappa values improved by about 0.15, resulting in excellent values for the 0.6-mm through 3-mm SR (0.95

Hepatocellular carcinoma associated with hereditary hemochromatosis occurring in non-cirrhotic liver.

The occurrence of primary hepatocellular carcinoma (HCC) in patients with hereditary hemochromatosis (HH) is well known. Thereby, the development of liver cirrhosis seems to be a prerequisite. Whether or not a hepatic iron overload in the context of hereditary hemochromatosis is an independent risk factor for HCC remains unclear. To date there are only a few reports about HCC arising in non-cirrhotic livers in the presence of HH. We report the case of a 64-year-old man who presented to our outpatient clinic with HCC. Liver cirrhosis could be excluded. Detailed exploration of the patient's history revealed that he had been treated by venesection for about 10 years up to 15 years ago. Subsequent investigations showed an elevated serum ferritin and transferrin saturation. The diagnosis of HH was confirmed by genetic testing, with homozygosity for the Cys282Tyr mutation. The patient received palliative chemotherapy and finally died 15 months after initial diagnosis of HCC.

Pharmacokinetic and clinical phase II trial of imatinib in patients with impaired liver function and advanced hepatocellular carcinoma.

OBJECTIVES: No effective chemotherapy for advanced hepatocellular carcinoma (HCC) exists. Expression of the platelet-derived growth factor receptor (PDGFR) has been demonstrated in HCC, which may derive from hepatic stem cells that express c-kit. The aim of this trial was to evaluate imatinib, a tyrosine kinase inhibitor of PDGFR and c-kit, in patients with advanced HCC and impaired liver function. PATIENTS AND METHODS: Patients were treated with 400-600 mg imatinib daily. Immunohistochemical staining was performed for PDGFR and c-kit. Response was assessed by CT scans every 8 weeks. For pharmacokinetics studies, 74 plasma samples were assessed. RESULTS: Of the 17 patients enrolled in the study, 15 were evaluable for response. Only 1 tumor was positive for PDGFR and none was positive for c-kit. Grade 3/4 neutropenia occurred in 2 patients (1 had neutropenic fever). There was no objective response, and 5 (33%) patients had stable disease. Median time to treatment failure was 1.8 months in the whole study cohort and 3.7 months in the patients with stable disease. Patients treated with 400 mg imatinib did not significantly differ in pharmacokinetics from patients with chronic myelogenous leukemia (CML). CONCLUSION: In this small group of patients with advanced, mostly PDGFR- and c-kit-negative HCC, imatinib showed no therapeutic effect. In contrast to CML patients, the pharmacokinetics of imatinib were not significantly affected by impaired liver function.

Vascular invasion in pancreatic cancer: value of multislice helical CT.

The evaluation of resectability in patients with pancreatic cancer remains a diagnostic challenge, especially regarding the preoperative assessment of vascular invasion. Thin-slice multiplanar reconstructions obtained with multislice helical computed tomography provide an exact depiction of the spatial relation between the tumor and the potentially invaded vessels and thus have the capability to improve the assessment of local resectability.

[MR imaging of pancreatic lesions with Mn-DPDP. A histopathologic correlation]. / MRT von Läsionen des Pankreas mittels Mn-DPDP - Eine histopathologische Korrelation.

PURPOSE: To examine the diagnostic accuracy of pancreatic lesions using mangafodipir-trisodium (Mn-DPDP) enhanced MR imaging. The imaging results were correlated with the histopathological results. MATERIAL AND METHODS: 40 patients with suspicion of pancreatic carcinoma were examined with MRI before and after i. v. administration of Mn-DPDP (Philips Gyroscan ACS NT 1.5 T, phased array body-coil: TSE T 2 with and without SPIR, TR 2000 ms, TE 120ms; FFE T 1 breathhold, TR 115 ms, TE 4.6 ms; MRCP, TR 6000 ms, TE 1200 ms; Teslascan i. v. 5 micromol Mn/kg; FFE T 1 breathhold SPIR, TR 140 ms, TE 4,6 ms). Two observers evaluated in consensus the number and characteristics of focal pancreatic lesions. The MR findings were correlated with histopathological findings retrospectively. RESULTS: The following lesions were found: adenocarcinoma (19), pancreatitis (8), adenocarcinoma within pancreatitis (3), insulinoma (2), hematoma (1), papillitis stenosans (1), signet ring cell carcinoma (1), metastasis of rectal carcinoma (1), papillary mesothelioma (1). In three patients there was no pathological finding. Mn-DPDP enhanced MRI showed a sensitivity of 100 % and a specificity of 56 %. CONCLUSION: Mn-DPDP enhanced MRI in conjunction with MRCP showed a high sensitivity for the detection of pancreatic lesions. However, the specificity is low, thus recommending Mn-DPDP enhanced MRI only as a complementary imaging method.

[VIBE with parallel acquisition technique - a novel approach to dynamic contrast-enhanced MR imaging of the liver]. / VIBE mit paralleler Akquisitionstechnik - eine neue Möglichkeit der dynamischen kontrastverstärkten MRT der Leber.

PURPOSE: The VIBE (volume interpolated breath-hold examination) sequence in combination with parallel acquisition technique (iPAT: integrated parallel acquisition technique) allows dynamic contrast-enhanced MRI of the liver with high temporal and spatial resolution. The aim of this study was to obtain first clinical experience with this technique for the detection and characterization of focal liver lesions. MATERIALS AND METHODS: We examined 10 consecutive patients using a 1.5 T MR system (gradient field strength 30 mT/m) with a phased-array coil combination. Following sequences were acquired: T 2 -w TSE and T 1 -w FLASH, after administration of gadolinium, 6 VIBE sequences with iPAT (TR/TE/matrix/partition thickness/time of acquisition: 6.2 ms/ 3.2 ms/256 x 192/4 mm/13 s), as well as T 1 -weighted FLASH with fat saturation. Two observers evaluated the different sequences concerning the number of lesions and their dignity. Following lesions were found: hepatocellular carcinoma (5 patients), hemangioma (2), metastasis (1), cyst (1), adenoma (1). RESULTS: The VIBE sequences were superior for the detection of lesions with arterial hyperperfusion with a total of 33 focal lesions. 21 lesions were found with T 2 -w TSE and 20 with plain T 1 -weighted FLASH. Diagnostic accuracy increased with the VIBE sequence in comparison to the other sequences. CONCLUSION: VIBE with iPAT allows MR imaging of the liver with high spatial and temporal resolution providing dynamic contrast-enhanced information about the whole liver. This may lead to improved detection of liver lesions, especially hepatocellular carcinoma.

Experimental investigations of image quality in X-ray mammography with conventional screen film system (SFS), digital phosphor storage plate in/without magnification technique (CR) and digital CCD-technique (CCD).

Comparison of image quality in X-ray mammography between conventional film screen film system (SFS), digital phosphor storage plate in and without magnification technique (CR) and digital CCD-technique (CCD). Radiograms of an RMI-mammography phantom were acquired using a conventional screen film system, three digital storage plate systems and two digital systems in CCD-technique. Additionally, the radiograms of one digital phosphor storage plate system were post-processed regarding contrast and included in the comparison. The detectability of details was best with the digital mammography in CCD-technique. After confirming these promising results in clinical studies, digital mammography should be able to replace conventional screen film technique.

[MR angiography of pelvic and leg arteries: initiation with time-resolved data acquisition of the lower legs]. / MR-Angiographie der Becken-Bein-Arterien: Beginn mit zeitaufgelöster Datenakquisition an den Unterschenkeln.

58 patients suffering from peripheral arterial vascular disease were examined using contrast-enhanced MR angiography with the intention of optimizing the visualization of lower leg arteries. Different from the customary acquisition order, were first the arteries of the lower legs depicted with three time-resolved phases. Afterwards, the iliacal and femoral vessels were imaged by applying the floating-table technique in two steps. In all cases, the lower leg arteries were depicted without overlying veins. By injecting the contrast agent in two phases, imaging quality of the iliofemoral arteries was not significantly reduced.--In conclusion, we would recommend the hybrid technique of peripheral contrast-enhanced MRA with primarily starting the acquisition of the lower legs in cases of foot infections or ulcerations where the transit time is reduced bi- or unilaterally.