Laurent Huwart

Institut d'Imagerie de Carouge Centre, Genève, Switzerland

The purpose of our study was to evaluate the technical feasibility of the combination involving percutaneous screw fixation and vertebroplasty in split fractures of thoracolumbar spine. Institutional review board approval and informed consent were obtained. Ten consecutive adult patients who had posttraumatic vertebral split fractures (Magerl A2) w...

Résumé Les lésions osseuses métastatiques sont révélatrices de 25 % des cancers et les métastases osseuses sont fréquentes dans l'évolution d'un cancer. Le rachis puis les os longs proximaux sont les plus touchés. La sémiologie radiologique élémentaire est donc importante à connaître pour faire le diagnostic de métastase(s) osseuse(s), notamment da...

The treatment of vertebral split fractures remains controversial, consisting of either corset or internal fixation. The aim of this study was to evaluate the technical feasibility of CT- and fluoroscopy-guided percutaneous vertebroplasty in the treatment of vertebral split fractures. Institutional review board approval and informed consent were obt...

We present a case of percutaneous fixation of a "carrot-stick" spinal fracture in an elderly patient with ankylosing spondylitis (AS). A surgical stabilization was not possible in this 83-year-old man with comorbidities. Under local anesthesia, percutaneous screw fixation of a transdiscal shear fracture at the level T10-T11 was performed using comp...

Purpose: To assess the feasibility of computed tomography (CT)- and fluoroscopy-guided percutaneous facet screw fixation following anterior lumbar interbody fusion (ALIF) or anterior pseudarthrosis in adults. Materials and methods: Institutional review board approval and informed consent were obtained for this study. One hundred seven consecutiv...

The aim of this study was to evaluate CT- and fluoroscopy-guided percutaneous screw fixation by radiologists in the management of acetabular roof fractures. Fifty-two consecutive adult patients with a nondisplaced and isolated acetabular roof fracture were prospectively treated by an interventional radiologist who made a percutaneous screw fixation...

PURPOSE The purpose of this study was to assess the efficiency of vertebroplasty in split fractures in adult patients. METHOD AND MATERIALS 50 adult patients (32 men and 18 women; mean age: 48 years) were prospectively treated by percutaneous vertebroplasty for post-traumatic split fractures (Magerl A2). MR imaging was systematically performed pre...

PURPOSE The purpose of this study was to assess the feasability of CT- and fluoroscopy-guided percutaneous transfacet screw fixation following anterior lumbar interbody fusion (ALIF) or anterior pseudarthrosis. METHOD AND MATERIALS 24 consecutive adult patients with ALIF or anterior pseudarthrosis were prospectively treated by percutaneous facet s...

PURPOSE The purpose of this study was to assess if the presence or not of intravertebral cleft could impact the effectiveness of percutaneous vertebroplasty in 50 adult patients with vertebra plana. METHOD AND MATERIALS 50 adult patients (14 men and 36 women; mean age: 81 years) with vertebra plana were prospectively treated by percutaneous verteb...

PURPOSE To evaluate CT- and fluoroscopy-guided percutaneous screw fixation in the management of acetabular roof fractures. METHOD AND MATERIALS Institutional review board approval and informed consent were obtained for this study. Fifty-two consecutive adult patients with a non-displaced and isolated acetabular roof fracture were prospectively tre...

Objectives: To evaluate the feasibility of computed tomography (CT)- and fluoroscopy-guided percutaneous screw fixation for the treatment of low-grade isthmic spondylolisthesis in adults. Methods: Ten consecutive adult patients (four men and six women; mean age: 57.1 [range, 44-78 years]) were prospectively treated by percutaneous screw fixation...

Objective To evaluate percutaneous computed tomography (CT)-guided intracystic and intra-articular steroid injections for the treatment of lumbar facet joint cyst causing radicular pain. Methods A single-centre prospective study involving 120 consecutive patients with symptomatic lumbar facet joint cyst-induced radicular pain was done (72 women, 48...

Objective To evaluate and compare two groups of patients with sciatica due to intervertebral disc herniation with no neurologic deficit. The groups consisted of patients with intervertebral disc herniation in a medial location (group 1) and those in a lateral location (group 2). Materials and methods A total of 200 patients were included in the stu...

Purpose We report a new minimally invasive technique of extraction of cement leakage following percutaneous vertebroplasty in adults. Methods Seven adult patients (five women, two men; mean age: 81 years) treated for vertebral compression fractures by percutaneous vertebroplasty had cement leakage into perivertebral soft tissues along the needle ro...

PURPOSE To describe and analyse the outcome of a new method of spondylolysis treatment which consists of a direct trans-isthmic fixation, realized under CT and fluoroscopic guidance and under local anaesthesia. METHOD AND MATERIALS Prospective study including 10 patients (4 males & 6 females, mean age 57) between Jan 2007 and Jan 2008. Inclusion...

Discography test associated with the scanner (discoscanner) is an exam that has been a renewed interest in recent few years. Thanks to the emergence of new interventions such as disc prosthesis, the procedures require confirmation of the disc level to deal with and the origin of discogenic symptoms. The aim of this paper is to describe the techniqu...

The aim of the study was to evaluate a new method for the quantification of renal blood flow using contrast-enhanced ultrasound (CEUS) in an ex vivo pig kidney model. After approval by the animal ethics committee, 4 pig kidneys were explanted and perfused with Celsior liquid (Imtix Sangstat, Lyon, France) at different flow rates (30, 50, 70 and 90...

To assess which MRI-derived kinetic parameters reflect decreased transvascular and interstitial transport when low- and high-molecular-weight agents are used in rat hepatocellular carcinomas. Dynamic MRI after injection of a low-molecular-weight contrast agent of 0.56 kDa (Gd-DOTA, gadoterate) and two high-molecular-weight contrast agents of 6.47 k...

Objectifs Décrire le principe et illustrer l’apport d’une séquence 2D IRM 4 en 1 (image d’eau, de graisse, en phase et en opposition de phase) en imagerie ostéo-articulaire. Matériels et méthodes Notre travail porte sur année d’utilisation de cette nouvelle séquence en IRM 1,5T. L’utilisation de la séquence IDEAL (Iterative Decomposition of water...

Magnetic resonance (MR) elastography is an emerging method for measuring the viscoelastic properties of tissues. Hepatic fibrosis, which increases the elasticity or stiffness of the liver, can be detected and staged by MR elastography. The technique has several advantages compared with transient ultrasound elastography (FibroScan): it can evaluate...

The purpose of our study was to prospectively compare the success rate and diagnostic accuracy of magnetic resonance elastography, ultrasound elastography, and aspartate aminotransferase to platelets ratio index (APRI) measurements for the noninvasive staging of fibrosis in patients with chronic liver disease. We performed a prospective blind compa...

A rapid and accurate MR imaging technique would be beneficial to assess paragangliomas in the head and neck and to distinguish them from other lesions. The purpose of this study was to determine whether the combination of elliptic centric contrast-enhanced MR angiography (CE-MRA) and unenhanced and enhanced spin-echo imaging (conventional MR imagin...

The purpose of this study was to prospectively compare the performance of magnetic resonance (MR) elastography using echo-planar and spin-echo imaging for staging of hepatic fibrosis. Twenty-four patients who had liver biopsy for suspicion of chronic liver disease had MR elastography performed with both spin-echo and echo-planar sequences. At histo...

To prospectively compare the sensitivity and specificity of magnetic resonance (MR) elastography with those of the routinely available aspartate aminotransferase-to-platelet ratio index (APRI) test for staging hepatic fibrosis in patients who have undergone liver biopsy for suspicion of chronic liver disease, with histopathologic examination as the...

Tumor angiogenesis induces the proliferation of immature blood vessels that are both heterogeneous and leaky. These characteristics can be demonstrated by measuring the perfusion parameters with MRI. Perfusion MRI is usually performed with in T1-weighted dynamic imaging after bolus injection of an exogenous contrast agent such as gadolinium chelate...

To determine the wall thickness and external diameter values of the normal appendix on multidetector computed tomography (MDCT). Materials and methods. A senior radiologist with no knowledge of the patient's surgical history prospectively examined the abdominal-pelvic CT scans of 57 consecutive adult patients with no suspicion for appendicitis. Mos...

Tumor angiogenesis induces the proliferation of immature blood vessels that are both heterogeneous and leaky. These characteristics can be demonstrated by measuring the perfusion parameters with MRI. Perfusion MRI is usually performed with in T1-weighted dynamic imaging after bolus injection of an exogenous contrast agent such as gadolinium chelate...

Objective To determine the wall thickness and external diameter values of the normal appendix on multidetector computed tomography (MDCT).

La biopsie hépatique est la méthode de référence actuelle pour évaluer le degré de fibrose hépatique. Plusieurs méthodes non vulnérantes ont été proposées comme alternatives. Parmi celles-ci, l’élastographie est une nouvelle méthode permettant d’évaluer le degré de fibrose hépatique en mesurant l’élasticité du parenchyme. Actuellement, l’élasticité...

To determine the frequency of detection of appendicoliths on normal appendix at multidetector row computed tomography (MDCT) with multiplanar reconstructions (MPR). A senior radiologist, blinded to patient's surgical history, prospectively and independently reviewed abdominopelvic MDCT scans in 57 consecutive adult patients without symptoms suggest...

PurposeTo determine the frequency of detection of appendicoliths on normal appendix at multidetector row computed tomography (MDCT) with multiplanar reconstructions (MPR).Materials and MethodsA senior radiologist, blinded to patient's surgical history, prospectively and independently reviewed abdominopelvic MDCT scans in 57 consecutive adult patien...

The aim of this study was to assess the feasibility of using non-invasive MR elastography for determining the stage of liver fibrosis. Twenty-five consecutive patients who had liver biopsy for suspicion of chronic liver disease were included in the study. The stage of fibrosis on the biopsies was assessed according to the METAVIR scoring system fro...

PURPOSE To evaluate the impact of imaging settings and region-of-interest (ROI) location on the quantification of renal cortical blood flow using an isolated perfused kidney model using contrast-enhanced ultrasonography (CE-US). METHOD AND MATERIALS After approval by the animal ethics committee, 4 pig kidneys were explanted and connected to an ex-...

Rupture of hepatocellular carcinoma represents a common and potentially fatal complication. Clinical situations may differ from temporary and compensated hemorrhage to massive peritoneal bleeding. This situation raises several questions: diagnostic delay, lack of knowledge about the different therapeutic options, treatment efficiency. Emergency dia...

Rupture of hepatocellular carcinoma represents a common and potentially fatal complication. Clinical situations may differ from temporary and compensated hemorrhage to massive peritoneal bleeding. This situation raises several questions: diagnostic delay, lack of knowledge about the different therapeutic options, treatment efficiency. Emergency dia...

Objectifs Savoir identifier une rupture de carcinome hepato-cellulaire en imagerie. Connaitre les differentes modalites therapeutiques et leur efficacite respective. Materiels et methodes A partir d’une revue de la litterature, rappel de l’epidemiologie, des circonstances de survenue, des mecanismes, des criteres predictifs et pronostiques de la ru...

PURPOSE/AIM To understand the indications, contraindications, technique, efficacy and limits of percutaneous cementoplasty of extraspinal painful osteolytic malignant lesions. CONTENT ORGANIZATION 1. History of cementoplasty 2. Review of indications (mainly extraspinal painful osteolytic malignant lesions: metastases and multiple myeloma) and cont...