P Schnyder

University Hospital of Lausanne, Lausanne, Vaud, Switzerland

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Publications (247)708.23 Total impact

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    ABSTRACT: (18)F-fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT) and MRI are used for detecting liver metastases from uveal melanoma. The introduction of new treatment options in clinical trials might benefit from early response assessment. Here, we determine the value of FDG-PET/CT with respect to MRI at diagnosis and its potential for monitoring therapy. Ten patients with biopsy-proven liver metastases of uveal melanoma enrolled in a randomized phase III trial (NCT00110123) underwent both FDG-PET coupled with unenhanced CT and gadolinium-diethylene triamine pentaacetic acid-enhanced liver MRI within 4 weeks. FDG-PET and MRI were evaluated blindly and then compared using the ratio of lesion to normal liver parenchyma PET-derived standardized uptake value (SUV). The influence of lesion size and response to chemotherapy were studied. Overall, 108 liver lesions were seen: 34 (31%) on both modalities (1-18 lesions/patient), four (4%) by PET/CT only, and 70 (65%) by MRI only. SUV correlated with MRI lesion size (r=0.81, P<0.0001). PET/CT detected 26 of 33 (79%) MRI lesions of more than or equal to 1.2 cm, whereas it detected only eight of 71 (11%) lesions of less than 1.2 cm (P<0.0001). MRI lesions without PET correspondence were small (0.6±0.2 vs. 2.1±1.1 cm, P<0.0001). During follow-up (six patients, 30 lesions), the ratio lesion-to-normal-liver SUV diminished in size-stable lesions (1.90±0.64-1.46±0.50, P<0.0001), whereas it increased in enlarging lesions (1.56±0.40-1.99±0.56, P=0.032). MRI outweighs PET/CT for detecting small liver metastases. However, PET/CT detected at least one liver metastasis per patient and changes in FDG uptake not related to size change, suggesting a role in assessing early therapy response.
    Melanoma research 02/2012; 22(1):63-9. DOI:10.1097/CMR.0b013e32834d3dcb · 2.28 Impact Factor
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    ABSTRACT: To compare multidetector-row computed tomographic (MDCT) enterography with magnetic resonance (MR) enterography performed upon acute exacerbation of Crohn's disease. Fifty-seven patients (mean age 33.5) with proven Crohn's disease and symptoms suggesting acute exacerbation were prospectively included. After oral administration of 1-2 liters of 5% methylcellulose, MDCT and MR enterography were performed on each patient (mean delay <24 h). Three radiologists blindly and independently evaluated each examination for technical quality and in terms of 8 pathological features of Crohn's disease. Observers' agreement, sensitivity and specificity resulted from comparison with the reference standard [surgery (n = 24), endoscopy (n = 17) and long-term follow-up (n = 16)]. MDCT enterography demonstrated fewer artifacts than MR enterography (p < 0.0001). In 48 MDCT/MR enterography examinations, active disease was demonstrated: abscesses (n = 11), fistulas (n = 13), stenoses (n = 23) and/or intestinal inflammation (n = 38). Observers' agreement (range 0.56-0.87) was not significantly different between MDCT and MR enterography, neither in terms of sensitivity (range 58-95%) nor specificity (range 67-100%) for each of the 8 pathological features. Statistically, MR enterography is of similar diagnostic value as MDCT enterography for acute complications of Crohn's disease. Since the typical Crohn's disease patient is young and will very likely undergo life-long imaging, and given concerns about radiation exposure with MDCT, MR enterography should be the preferred modality.
    Digestion 06/2010; 82(4):229-38. DOI:10.1159/000288521 · 2.10 Impact Factor
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    ABSTRACT: We report a case series of three children with solid pseudopapillary tumor of the pancreas (SPT) in which a complete radiological work-up, including ultrasound, computed tomography scans, and MRI, has been carried out. The aim of this article is to highlight the characteristic imaging findings of SPT in the pediatric age group and to establish a correlation with typical histopathological findings of the lesion.
    Clinical imaging 03/2010; 34(2):152-6. DOI:10.1016/j.clinimag.2009.06.024 · 0.81 Impact Factor
  • F Gudinchet · P Schnyder ·
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    ABSTRACT: Mesenteric panniculitis is an inflammatory condition of mesenteric fat which may result in peritoneal space occupying lesions. Only two previously reported cases in the English literature have been evaluated by computed tomography (CT). We present 2 additional cases and emphasize that CT patterns are not specific, but suggest the diagnosis in the presence of a well-defined fibrous wall circumscribing a fatty mass containing regions with attenuation near that of water. Lymphoma and mesenteric metastases should be considered the most frequent radiologic, clinical and surgical differential diagnosis.
    Acta Radiologica 01/2010; 28(6):727-9. DOI:10.3109/02841858709177433 · 1.60 Impact Factor
  • E. Senggen · E. Rizzo · P. Schnyder · S. Schmidt ·

    Journal de Radiologie 10/2009; 90(10):1615-1616. DOI:10.1016/S0221-0363(09)76351-6 · 0.57 Impact Factor
  • R. Duran · A. Denys · P. Schnyder · S. Schmidt ·

    Journal de Radiologie 10/2009; 90(10):1530-1530. DOI:10.1016/S0221-0363(09)75986-4 · 0.57 Impact Factor
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    ABSTRACT: The purpose of this study is to compare the accuracy of prenatal ultrasound (US) and prenatal magnetic resonance imaging (MRI) in the diagnosis and characterization of congenital abnormalities of the genito-urinary tract and to determine if the additional information obtained by MRI may influence the management of the fetus. We retrospectively evaluate 15 cases of congenital genito-urinary tract anomalies detected by prenatal US and with echographic inconclusive diagnosis. We compare the MRI findings with the US findings and the final diagnosis, obtained from neonatal outcomes, imaging studies and pathology records. Fetal US diagnosis was correct in 9 cases (60%) and MRI in 13 cases (86.7%). Prenatal MRI revealed additional information to US in 9 cases (60%), which modified the initial US diagnosis in 5 cases (33.3%) and changed the therapeutic approach in 5 fetuses (33.3%). Fetal MRI was better than US in cases of oligoamnios and in fetuses with genito-urinary pathology concerning the pelvic and perineum region. We believe that MRI should be considered as a complementary diagnostic method in cases of echographic suspicion of congenital pathology of the genito-urinary tract and inconclusive prenatal US.
    European journal of radiology 08/2009; 76(2):258-64. DOI:10.1016/j.ejrad.2009.06.030 · 2.37 Impact Factor
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    ABSTRACT: Our aim was to assess the clinical outcome of patients who were subjected to long-axis sacroplasty for the treatment of sacral insufficiency fractures. Nineteen patients with unilateral (n = 3) or bilateral (n = 16) sacral fractures were involved. Under local anaesthesia, each patient was subjected to CT-guided sacroplasty using the long-axis approach through a single entry point. An average of 6 ml of polymethylmethacrylate (PMMA) was delivered along the path of each sacral fracture. For each individual patient, the Visual Analogue pain Scale (VAS) before sacroplasty and at 1, 4, 24 and 48 weeks after the procedure was obtained. Furthermore, the use of analgesics (narcotic/nonnarcotic) along with the evolution of post-interventional patient mobility before and after sacroplasty was also recorded. The mean pre-procedure VAS was 8±1.9 (range, 2 to 10). This rapidly and significantly (P<0.001) declined in the first week after the procedure (mean 4±1.4; range, 1 to 7) followed by a gradual and significant (P<0.001) decrease along the rest of the follow-up period at 4 weeks (mean 3±1.1; range, 1 to 5), 24 weeks (mean 2.2±1.1; range, 1 to 5) and 48 weeks (mean 1.6±1.1; range, 1 to 5). Eleven (58%) patients were under narcotic analgesia before sacroplasty, whereas 8 (42%) patients were using nonnarcotics. Corresponding values after the procedure were 2/19 (10%; narcotic, one of them was on reserve) and 10/19 (53%; non-narcotic). The remaining 7 (37%) patients did not address post-procedure analgesic use. The evolution of post-interventional mobility was favourable in the study group as they revealed a significant improvement in their mobility point scale (P<0.001). Long-axis percutaneous sacroplasty is a suitable, minimally invasive treatment option for patients who present with sacral insufficiency fractures. More studies with larger patient numbers are needed to explore any unrecognised limitations of this therapeutic approach.
    European Radiology 06/2009; 19(12):3002-7. DOI:10.1007/s00330-009-1486-3 · 4.01 Impact Factor
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    ABSTRACT: This article presents a feasibility study with the objective of investigating the potential of multi-detector computed tomography (MDCT) to estimate the bone age and sex of deceased persons. To obtain virtual skeletons, the bodies of 22 deceased persons with known age at death were scanned by MDCT using a special protocol that consisted of high-resolution imaging of the skull, shoulder girdle (including the upper half of the humeri), the symphysis pubis and the upper halves of the femora. Bone and soft-tissue reconstructions were performed in two and three dimensions. The resulting data were investigated by three anthropologists with different professional experience. Sex was determined by investigating three-dimensional models of the skull and pelvis. As a basic orientation for the age estimation, the complex method according to Nemeskéri and co-workers was applied. The final estimation was effected using additional parameters like the state of dentition, degeneration of the spine, etc., which where chosen individually by the three observers according to their experience. The results of the study show that the estimation of sex and age is possible by the use of MDCT. Virtual skeletons present an ideal collection for anthropological studies, because they are obtained in a non-invasive way and can be investigated ad infinitum.
    European Radiology 10/2008; 19(2):419-29. DOI:10.1007/s00330-008-1155-y · 4.01 Impact Factor
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    ABSTRACT: The steady increase in the number of radiologic procedures being performed is undeniably having a beneficial impact on healthcare. However, it is also becoming common practice to quantify the health detriment from radiation exposure by calculating the number of cancer-related deaths inferred from the effective dose delivered to a given patient population. The inference of a certain number of expected deaths from the effective dose is to be discouraged, but it remains important as a means of raising professional awareness of the danger associated with ionizing radiation. The risk associated with a radiologic examination appears to be rather low compared with the natural risk. However, any added risk, no matter how small, is unacceptable if it does not benefit the patient. The concept of diagnostic reference levels should be used to reduce variations in practice among institutions and to promote optimal dose indicator ranges for specific imaging protocols. In general, the basic principles of radiation protection (eg, justification and optimization of a procedure) need to be respected to help counteract the unjustified explosion in the number of procedures being performed.
    Radiographics 10/2008; 28(7):1807-16. DOI:10.1148/rg.287085042 · 2.60 Impact Factor
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    ABSTRACT: Objectifs Corréler les données IRM et histologiques de patientes ayant un antécédent de cancer du sein et secondairement explorées pour masses annexielles en IRM. Matériels et méthodes Une recherche sur base de données a identifié 41 patientes avec cancer du sein traité puis opérées pour masse annexielle. Critères morphologiques et vasculaires furent revus rétrospectivement (bilatéralité, taille, type tumoral, portion tissulaire, ascite et prise de contraste). Une analyse statistique fut effectuée. Résultats En histologie, des masses bénignes et malignes étaient présentes chez 20 (48,8 %) et 21 (51,2 %) patientes (11 primitives et 10 métastases). En IRM, la taille moyenne (± SD) des tumeurs bénignes et malignes étaient de 55 mm ± 39 and 63,7 mm ± 32,5. Des lésions bilatérales étaient présentes chez 3/20 lésions bénignes et 14/21 malignes (p < ,0013). Une prédominance solide était notée chez 4/20 tumeurs bénignes et 13/21 tumeurs malignes (p < 0,0001). La présence de végétations était spécifique de tumeurs primitives épithéliales, particulièrement malignes. Une ascite était associée à 4 tumeurs bénignes et 10 tumeurs malignes. Conclusion Chez des patientes avec antécédent de cancer du sein, la présence de lésions annexielles bilatérales à prédominance solide suggèrent la malignité. La présence de végétations suggère une origine ovarienne primitive.
    Journal de Radiologie 10/2008; 89(10):1230-1230. DOI:10.1016/S0221-0363(08)75651-8 · 0.57 Impact Factor
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    ABSTRACT: Emergency departments are facing nowadays an increasing number of illegal drug-related health problems, associated with medicolegal and/or social consequences. Body stuffers are street cocaine dealers, who either store wrapped packets of drugs in their rectum or hastily swallow them, prompted by fear of police's arrest. These packets can be life threatening in case of leakage. We evaluate the diagnostic value of unenhanced multidetector CT (MDCT) for detection of cocaine-filled packets (CFP) ingested by body stuffers in a phantom model. Our phantom simulated normal bowel contents in which a varying number of true and false CFP were randomly mixed. Both only differ in radiological density. During 18 different reading sessions, four radiologists independently evaluated the presence and number of true and false CFP. Interobserver agreement, sensitivity, specificity, positive and negative predictive value were calculated. Interobserver agreement for detection of any packets, for visualization of true, and false CFP was good (kappa=0.63, 0.74 and 0.58, respectively). Sensitivity, specificity, positive and negative predictive value for detection of any packets was 95.6%, 100%, 100% and 62.5%, respectively; for visualization of the true CFP 86.5%, 100%, 100% and 77.6%, respectively; and for the false packets 98.1%, 65%, 88.6% and 87.5%, respectively. Unenhanced MDCT without bowel preparation is a fast, reliable and easily reproducible imaging modality for the immediate detection of ingested CFP, thus facilitating medicolegal management of body stuffers.
    European Journal of Radiology 08/2008; 67(1):133-8. DOI:10.1016/j.ejrad.2007.07.017 · 2.37 Impact Factor
  • A Kawkabani · P Bize · P Jichlinski · P Schnyder · JY Meuwly ·

    Ultraschall in der Medizin 08/2008; 29. DOI:10.1055/s-0028-1085742 · 4.92 Impact Factor
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    Sabine Schmidt · Nicolas Demartines · Luc Soler · Pierre Schnyder · Alban Denys ·
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    ABSTRACT: The normal anatomy of the portal vein is defined as a division of the main portal vein into two branches-the left (supplying segments II, III, and IV) and right portal veins; the right dividing secondarily into two branches-the anterior (supplying segments V and VIII) and the posterior (supplying segments VI and VII) portal veins. Variants are frequent and account for 20 to 35% of the population. The most frequent variants are portal trifurcation with division of the main portal vein into the left, right anterior, and posterior branches, and the early origin of the right posterior branch directly from the portal vein. The presence of portal vein variants increases the risk of bile duct hilar anatomical variation. These variants must be diagnosed before complex hepatectomy, split or living donor transplantation, and before complex interventional procedures such as portal vein embolization. The purpose of this article is to review normal and variant portal venous anatomy and their implications for liver surgery and preoperative portal vein embolization.
    Seminars in Interventional Radiology 06/2008; 25(2):86-91. DOI:10.1055/s-2008-1076688
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    ABSTRACT: Our aim was to investigate the diagnostic value of unenhanced MDCT in anemic patients. Fifty consecutive patients with proven anemia and 50 nonanemic matched group for age, sex and body mass index were evaluated. In either group, hemoglobin levels were assessed no more than 24 h from an unenhanced CT of the thorax. For each patient, the presence of a hyperattenuating aortic wall (aortic ring sign) and/or dense interventricular septum (subjective parameters) were identified by two radiologists who were blinded to the laboratory findings. Furthermore, the aortic CT attenuation values (objective parameter) were also obtained and correlated with the hemoglobin levels. The sensitivity and specificity in detecting anemia were calculated for each variable, and ROC analysis was generated for subjective and objective parameters. Subjective image analysis revealed that the aortic ring sign was more sensitive than the interventricular septum sign for anemia detection (84% vs. 72%), whereas this latter sign was more specific (100% vs. 92%). A good correlation (r = 0.60) was observed between the aortic CT attenuation values and the hemoglobin levels in the whole study population. Using a threshold of < or = 35 HU for anemia diagnosis, the sensitivity and specificity of aortic CT attenuation value were 84% and 94%, respectively, with the largest area under the curve (0.89) among all diagnostic criteria. However, the best trade-off between sensitivity (80%) and specificity (100%) was obtained from combining both subjective and objective analysis. Interpreting anemia upon unnenhanced MDCT of the thorax is quite feasible. A diagnostic approach that considers both subjective and objective analysis offers the best trade-off between sensitivity and specificity.
    European Radiology 05/2008; 18(9):1863-8. DOI:10.1007/s00330-008-0950-9 · 4.01 Impact Factor
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    ABSTRACT: To compare the indices of right ventricular dysfunction (RVD) obtained from axial transverse images with those derived from the reconstructed 4-chamber and short-axis views in patients with acute pulmonary embolism (PE). Eighty-eight patients with acute PE were retrospectively enrolled. For each patient, axial transverse images and reconstructed 4-chamber and short-axis views were reviewed. Measurements of the ratios of right ventricle to left ventricle (RV/LV) diameters and RV/LV areas were then obtained from all series. Values derived from each method were compared and correlated to arterial obstruction index. In the studied cohort, RV/LV diameters and RV/LV areas obtained from axial transverse images and the reconstructed 4-chamber views were not statistically different. In contrast, a statistically significant difference was observed between the values of RV/LV areas derived from both axial transverse and 4-chamber views and those obtained from short-axis views (P < 0.0001). There was a weak to moderate correlation between both RV/LV diameters and RV/LV areas and the computed tomographic obstruction index. However, when the study cohort was divided into 3 subgroups with an arterial obstruction index of less than 15% (n = 26), 15% to 30% (n = 21), and greater than 30% (n = 41), those who had values greater than 30% revealed the highest correlation with the indices of RVD. In patients with acute PE, the indices of RVD derived from axial transverse images and the reconstructed 4-chamber views yield comparative values. Given the simplicity of the former analysis, it should be taken into consideration for risk stratification in acute PE.
    Journal of Computer Assisted Tomography 05/2008; 32(3):438-43. DOI:10.1097/RCT.0b013e3180ca7818 · 1.41 Impact Factor
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    ABSTRACT: To compare three spin-echo sequences, transverse T1-weighted (T1WI), transverse fat-saturated (FS) T2-weighted (T2WI), and transverse gadolinium-enhanced (Gd) FS T1WI, for the visualisation of normal and abnormal finger A2 pulley with magnetic resonance (MR) imaging at 3 tesla (T). Sixty-three fingers from 21 patients were consecutively investigated. Two musculoskeletal radiologists retrospectively compared all sequences to assess the visibility of normal and abnormal A2 pulleys and the presence of motion or ghost artefacts. Normal and abnormal A2 pulleys were visible in 94% (59/63) and 95% (60/63) on T1WI sequences, in 63% (40/63) and 60% (38/63) on FS T2WI sequences, and in 87% (55/63) and 73% (46/63) on Gd FS T1WI sequences when read by the first and second observer, respectively. Motion and ghost artefacts were higher on FS T2WI sequences. Seven among eight abnormal A2 pulleys were detected, and were best depicted with Gd FS T1WI sequences in 71% (5/7) and 86% (6/7) by the first and the second observer, respectively. In 3-T MRI, the comparison between transverse T1WI, FS T2WI, and Gd FS T1WI sequences shows that transverse T1WI allows excellent depiction of the A2 pulley, that FS T2WI suffers from a higher rate of motion and ghost artefacts, and transverse Gd FS T1WI is the best sequence for the depiction of abnormal A2 pulley.
    Skeletal Radiology 05/2008; 37(4):307-12. DOI:10.1007/s00256-007-0426-z · 1.51 Impact Factor
  • T Laswed · E Rizzo · D Guntern · F Doenz · A Denys · P Schnyder · S D Qanadli ·
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    ABSTRACT: We evaluated 16-detector-row CT in the assessment of occlusive peripheral arterial disease (PAD) of the abdominal aorta and lower extremities using an adaptive method of acquisition to optimise arterial enhancement especially for the distal foot arteries. Thirty-four patients underwent transcatheter angiography (TCA) and CT angiography within 15 days. For each patient, table speed and rotation were selected according to the calculated optimal transit time of contrast material obtained after a single bolus test and two dynamic acquisitions at aorta and popliteal arteries. Analysis included image quality and detection of stenosis equal or greater than 50% on a patient basis and on an arterial segment basis. Sensitivity and specificity of CT were calculated with the TCA considered as the standard of reference. CT was conclusive in all segments with no technical failures even in difficult cases with occluded bypasses and aneurysms. On patient-basis analysis, the overall sensitivity and specificity to detect significant stenosis greater than 50% were both 100%. Segmental analysis shows high values of sensitivity and specificity ranging from 91 to 100% and from 81 to 100%, respectively, including distal pedal arteries. Sixteen-detector-row CT angiography using an adaptive acquisition improves the image quality and provides a reliable non-invasive technique to assess occlusive peripheral arterial disease, including distal foot arteries.
    European Radiology 03/2008; 18(2):263-72. DOI:10.1007/s00330-007-0749-0 · 4.01 Impact Factor
  • S Schmidt · P Chevallier · B Bessoud · J-Y Meuwly · C Felley · R Meuli · P Schnyder · A Denys ·
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    ABSTRACT: The diagnostic performance of magnetic resonance imaging (MRI) for detection of intestinal fistulas, other than perianal, in patients with known complicated inflammatory bowel conditions (CIBC) was investigated. Our study group consisted of 20 patients (12 women, mean age 43 years) with CIBC, including Crohn's disease (n=13), colonic diverticulitis (n=3), colitis after radiotherapy (n=3) and of postoperative origin (n=1). Eleven surgically proven enteral fistulas were known in ten (50%) of these patients, being of enterovesical (n=3), enterocolic (n=2), enteroenteral (n=2), rectovaginal (n=2), rectovaginovesical (n=1) and of entercutaneous (n=1) localisation. The other ten patients (50%), used as the control group, showed MR features of CIBC, although without any fistulous tract. Multiplanar T1- and T2-weighted sequences had been performed, including gadolinium-enhanced acquisition with fat saturation (1.5 T). MR findings were independently blindly and retrospectively reviewed by three radiologists for the presence and etiology of any fistula, as well as visualization and characterization of the fistulous tract. Results were compared with surgical findings (n=16) and clinical evolution (n=4). Interobserver agreement was calculated. Interobserver agreement kappa for fistula detection was 0.71. Overall sensitivity, specificity and accuracy for fistula detection were 78.6%, 75% and 77.2%, respectively. Sensitivity for fistula characterization was 80.6%, with visualization of the fistulous tract in all cases, whereby T1-weighted gadolinium-enhanced fat-saturated images were considered the most useful sequences. Gadolinium-enhanced MRI is a reliable and reproducible tool for detection of enteral fistulas secondary to inflammatory conditions.
    European Radiology 12/2007; 17(11):2957-63. DOI:10.1007/s00330-007-0669-z · 4.01 Impact Factor
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    ABSTRACT: PURPOSE To determine dose thresholds, in term of CTDIvol, where subtle diagnostically relevant details of pediatric CT images becomes no more detectable. METHOD AND MATERIALS Abdomen images of 8 patients (age range 2 to 16 years old) were acquired using a 8-slice CT system (GE Lightspeed Ultra) with CTDIvol values in the range of 17 to 22 mGy adapted for patient age and compatible with our national Reference Levels. Raw data were then processed to simulate major dose reductions (up to tenfold). All images were reviewed and scored independently by four experienced radiologists using the VGA methodology (Visual Grading Analysis) to determine the dose threshold where a significant loss of normal anatomy conspicuity appeared. Data were analyzed with ANOVA and Tukey HSD tests, a p>0.05 was considered to be significant. RESULTS No significant difference in VGA scoring appeared for CTDIvol as low as 3 mGy in children under 10 years old (≤35 kg), whereas a significant loss of image quality was noticed when lowering the CTDIvol from 10 to 3 mGy for children in the 10 to 16 years group (> 35 kg). CONCLUSION Compared to the present Reference Levels proposed for pediatric CT it seems that dose can be further reduced without significant loss of normal anatomy conspicuity. Nevertheless, a CTDIvol lower than 3 mGy in abdominal tomography for children over 35 kg produces images where diagnostically relevant details are no more detectable. CLINICAL RELEVANCE/APPLICATION Avoiding unnecessary dose during CT examinations on children while keeping a sufficient image quality level.
    Radiological Society of North America 2007 Scientific Assembly and Annual Meeting; 11/2007

Publication Stats

6k Citations
708.23 Total Impact Points


  • 1986-2010
    • University Hospital of Lausanne
      • Service de radiodiagnostic et radiologie interventionnelle
      Lausanne, Vaud, Switzerland
  • 1988-2008
    • University of Lausanne
      Lausanne, Vaud, Switzerland
  • 1996
    • Institut La Source
      Lausanne, Vaud, Switzerland
  • 1991
    • Inselspital, Universitätsspital Bern
      Berna, Bern, Switzerland