P. Parizel | University of Antwerp (original) (raw)

Papers by P. Parizel

Research paper thumbnail of Massive infarction of a recurrent phyllodes tumor of the breast: MRI-findings

JBR-BTR : organe de la Société royale belge de radiologie (SRBR) = orgaan van de Koninklijke Belgische Vereniging voor Radiologie (KBVR)

We report the imaging findings in an infarcted phyllodes tumor of the breast. A 40-year-old woman... more We report the imaging findings in an infarcted phyllodes tumor of the breast. A 40-year-old woman presented ten months after surgery for a benign phyllodes tumour with a palpable lump under the scar. We performed clinical examination, mammography, sonography, and MRI. The radiological diagnosis was a postoperative hematoma with granulation tissue. Surgery was performed. Histological diagnosis revealed an infarcted phyllodes tumour. This case illustrates the radiological presentation of a completely infarcted phyllodes tumour. As far as we know, imaging findings of an infarcted phyllodes tumour have not been reported yet.

Research paper thumbnail of Parinaud's syndrome in a patient with multifocal glioma

Journal belge de radiologie

We describe the clinical and neuroradiological findings in a 63-year-old man with Parinaud's ... more We describe the clinical and neuroradiological findings in a 63-year-old man with Parinaud's syndrome. Magnetic resonance (MR) imaging showed a mass lesion within the quadrigeminal plate. Additional MR findings included a right frontoparietal subcortical lesion as well as periventricular white matter edema due to acute deterioration of hydrocephalus. On MR, the diagnosis of multifocal glioma was proposed. Neuropathological examination after resection of the supratentorial lesion revealed an oligodendroglioma, grade II.

Research paper thumbnail of Baló's concentric sclerosis

JBR-BTR : organe de la Société royale belge de radiologie (SRBR) = orgaan van de Koninklijke Belgische Vereniging voor Radiologie (KBVR)

A 24-year-old woman complained of progressive headache and right sided visual disturbances. Previ... more A 24-year-old woman complained of progressive headache and right sided visual disturbances. Previous medical history was unremarkable. Neurological examination did not reveal additional abnormalities.

Research paper thumbnail of Phase-contrast magnetic resonance angiography

JBR-BTR : organe de la Société royale belge de radiologie (SRBR) = orgaan van de Koninklijke Belgische Vereniging voor Radiologie (KBVR)

Time of flight (TOF) and phase contrast (PC) magnetic resonance angiography (MRA) are two establi... more Time of flight (TOF) and phase contrast (PC) magnetic resonance angiography (MRA) are two established magnetic resonance (MR) techniques that were described and developed in the 1980s. Both of these techniques usually do not involve the use of intravascular contrast, but rather exploit the intrinsic contrast provided by flowing blood to produce vascular signal. Bolus infused (gadolinium-enhanced) MR angiography was only introduced in 1993. PC-MRA uses the phase shifts introduced to nuclei with motion in the presence of a magnetic field gradient. A bipolar magnetic field gradient will induce a phase shift to nuclei moving along the gradient dependent on the velocity, as well as acceleration and higher order motion terms. More complex gradient waveforms enable sensitivity to specific motion terms such as velocity or acceleration. By constructing an image in which the intensity is proportional to the phase shift of the nuclei, it is possible to create an angiographic image related to t...

Research paper thumbnail of Imaging in patients with vertigo

JBR-BTR: organe de la Société royale belge de radiologie (SRBR) = orgaan van de Koninklijke Belgische Vereniging voor Radiologie (KBVR)

Research paper thumbnail of Effect of field strength on gadolinium enhancement in MR imaging

Research paper thumbnail of “William Tell” Injury: MDCT of an Arrow Through the Head

American Journal of Roentgenology, 2004

Research paper thumbnail of Maxillo-facial trauma

JBR-BTR: organe de la Société royale belge de radiologie (SRBR) = orgaan van de Koninklijke Belgische Vereniging voor Radiologie (KBVR)

Injuries to the facial bones, orbits and adjacent soft tissue structures are common. Despite the ... more Injuries to the facial bones, orbits and adjacent soft tissue structures are common. Despite the increasing safety precautions in modern cars, facial injury is very often caused by motor vehicle accidents. Severe trauma to the face is a strong indication for radiological investigation. In the patient with maxillo-facial trauma, the radiological exploration of should answer two major questions: do the fractures involve areas that may alter the physiologic function of the sinuses, mouth, nasal vault or orbit?, and will the fracture result in any cosmetically detectable abnormality? The goal of the radiological work-up is to define the number and exact location of the fractures, to determine if there is any depression, elevation, or distraction of the fracture fragments, and to assess concomitant soft tissue complications. In this article, we review the role of clinical evaluation, plain X-rays, computed tomography (CT) and magnetic resonance imaging (MRI). Imaging findings are correla...

Research paper thumbnail of Review Article: MRI of the postoperative lumbar spine

Research paper thumbnail of Clinical usefulness of contrast-enhanced MP-RAGE of the brain

Neuroradiology, 1996

Our purpose was to evaluate the usefulness of a 3D T1-weighted gradient-echo sequence (MP-RAGE) i... more Our purpose was to evaluate the usefulness of a 3D T1-weighted gradient-echo sequence (MP-RAGE) in clinical practice. We prospectively examined 200 patients with a variety of neurological disorders and symptoms. We compared lesion conspicuity and contrast enhancement on MP-RAGE images with conventional gadolinium-enhanced spin-echo (SE) T1-weighted images. Both the original MP-RAGE data and the reformatted images were characterised by improved differentiation between grey and white matter. More lesions were found on the 3D series, in both patients with neoplastic and non-neoplastic disease. Contrast enhancement of small oedematous lesions affecting the white matter in demyelinating disease was less obvious. Multiplanar reformatting, which can be realised in any desired plane and surface rendering with sophisticated segmentation algorithms superbly displayed the underlying anatomical relationships between lesions and normal brain structures. Excellent spatial resolution, the absence of posterior fossa artefacts and equivalent contrast enhancement resulted in an increased number of space-occupying lesions being found on the MP-RAGE images. Thus contrast-enhanced MP-RAGE is an alternative to conventional SE imaging in the investigation of intracranial masses. Although the total number of lesions found in patients with demyelinating disease was significantly higher on MP-RAGE, demonstration of blood-brain-barrier breakdown in active lesions was less obvious.

Research paper thumbnail of Cortical hypoxic-ischemic brain damage in shaken-baby (shaken impact) syndrome: value of diffusion-weighted MRI

Pediatric Radiology, 2003

Research paper thumbnail of Spinal tumors

European Journal of Radiology, 2004

Spinal tumors are uncommon lesions but may cause significant morbidity in terms of limb dysfuncti... more Spinal tumors are uncommon lesions but may cause significant morbidity in terms of limb dysfunction. In establishing the differential diagnosis for a spinal lesion, location is the most important feature, but the clinical presentation and the patient's age and gender are also important. Magnetic resonance (MR) imaging plays a central role in the imaging of spinal tumors, easily allowing tumors to be classified as extradural, intradural-extramedullary or intramedullary, which is very useful in tumor characterization. In the evaluation of lesions of the osseous spine both computed tomography (CT) and MR are important.

Research paper thumbnail of Imaging findings in diffuse axonal injury after closed head trauma

Research paper thumbnail of Intracranial hemorrhage: principles of CT and MRI interpretation

European Radiology, 2001

Intracranial hemorrhage is a potentially life-threatening neurological condition. It results in a... more Intracranial hemorrhage is a potentially life-threatening neurological condition. It results in a significant burden on health care resources. Patient outcome is influenced by an early and accurate diagnosis. Radiological assessment of intracranial blood is challenging, due to the highly variable appearance of intracranial blood, depending on its age and location. It is therefore important to understand the underlying physical, biological, and biochemical factors of an evolving hematoma and to correlate them with the aspect on cross-sectional imaging techniques.

Research paper thumbnail of Distribution and incidence of degenerative spine changes in patients with a lumbo-sacral transitional vertebra

European Spine Journal, 1997

The purpose of this pro-

Research paper thumbnail of Understanding chemical shift induced boundary artefacts as a function of field strength: influence of imaging parameters (bandwidth, field-of-view, and matrix size)

European Journal of Radiology, 1994

Research paper thumbnail of Influence of Magnetic Field Strength on T2* Decay and Phase Effects in Gradient Echo MRI of Vertebral Bone Marrow

Journal of Computer Assisted Tomography, 1995

Research paper thumbnail of Magnetic resonance imaging of calcified thoracic disk herniation

European Journal of Radiology, 1993

Research paper thumbnail of Characterization of brain tumors

Neuroradiology plays an essential part in the clinical management of patients with brain tumors [... more Neuroradiology plays an essential part in the clinical management of patients with brain tumors [1]. Magnetic resonance imaging (MRI) and, to a lesser extent, computed tomography (CT) are the cornerstones for the diagnosis, definition of extent, detection of spread and follow-up of residual or recurrent tumor [2]. The purpose of this presentation is to discuss basic and advanced neuroradiological techniques that have been developed in the examination and management of patients with brain tumors. Until recently, neuroradiological techniques were used to characterize cerebral neoplasms by: • Definition of the exact tumor location (intra-or extra-axial, supra-or infratentorial) [3,4,5]; • Demonstration of anatomy in various planes; • Display of differences in tissue density (MDCT); • Display of differences in MRI signal intensity between normal and abnormal brain tissue; • Use of contrast media to demonstrate tumor vascularity (cerebral arteriography) or to detect breakdown of the bloo...

Research paper thumbnail of Headache: when is neuroimaging needed?

JBR-BTR: organe de la Société royale belge de radiologie (SRBR) = orgaan van de Koninklijke Belgische Vereniging voor Radiologie (KBVR)

Research paper thumbnail of Massive infarction of a recurrent phyllodes tumor of the breast: MRI-findings

JBR-BTR : organe de la Société royale belge de radiologie (SRBR) = orgaan van de Koninklijke Belgische Vereniging voor Radiologie (KBVR)

We report the imaging findings in an infarcted phyllodes tumor of the breast. A 40-year-old woman... more We report the imaging findings in an infarcted phyllodes tumor of the breast. A 40-year-old woman presented ten months after surgery for a benign phyllodes tumour with a palpable lump under the scar. We performed clinical examination, mammography, sonography, and MRI. The radiological diagnosis was a postoperative hematoma with granulation tissue. Surgery was performed. Histological diagnosis revealed an infarcted phyllodes tumour. This case illustrates the radiological presentation of a completely infarcted phyllodes tumour. As far as we know, imaging findings of an infarcted phyllodes tumour have not been reported yet.

Research paper thumbnail of Parinaud's syndrome in a patient with multifocal glioma

Journal belge de radiologie

We describe the clinical and neuroradiological findings in a 63-year-old man with Parinaud's ... more We describe the clinical and neuroradiological findings in a 63-year-old man with Parinaud's syndrome. Magnetic resonance (MR) imaging showed a mass lesion within the quadrigeminal plate. Additional MR findings included a right frontoparietal subcortical lesion as well as periventricular white matter edema due to acute deterioration of hydrocephalus. On MR, the diagnosis of multifocal glioma was proposed. Neuropathological examination after resection of the supratentorial lesion revealed an oligodendroglioma, grade II.

Research paper thumbnail of Baló's concentric sclerosis

JBR-BTR : organe de la Société royale belge de radiologie (SRBR) = orgaan van de Koninklijke Belgische Vereniging voor Radiologie (KBVR)

A 24-year-old woman complained of progressive headache and right sided visual disturbances. Previ... more A 24-year-old woman complained of progressive headache and right sided visual disturbances. Previous medical history was unremarkable. Neurological examination did not reveal additional abnormalities.

Research paper thumbnail of Phase-contrast magnetic resonance angiography

JBR-BTR : organe de la Société royale belge de radiologie (SRBR) = orgaan van de Koninklijke Belgische Vereniging voor Radiologie (KBVR)

Time of flight (TOF) and phase contrast (PC) magnetic resonance angiography (MRA) are two establi... more Time of flight (TOF) and phase contrast (PC) magnetic resonance angiography (MRA) are two established magnetic resonance (MR) techniques that were described and developed in the 1980s. Both of these techniques usually do not involve the use of intravascular contrast, but rather exploit the intrinsic contrast provided by flowing blood to produce vascular signal. Bolus infused (gadolinium-enhanced) MR angiography was only introduced in 1993. PC-MRA uses the phase shifts introduced to nuclei with motion in the presence of a magnetic field gradient. A bipolar magnetic field gradient will induce a phase shift to nuclei moving along the gradient dependent on the velocity, as well as acceleration and higher order motion terms. More complex gradient waveforms enable sensitivity to specific motion terms such as velocity or acceleration. By constructing an image in which the intensity is proportional to the phase shift of the nuclei, it is possible to create an angiographic image related to t...

Research paper thumbnail of Imaging in patients with vertigo

JBR-BTR: organe de la Société royale belge de radiologie (SRBR) = orgaan van de Koninklijke Belgische Vereniging voor Radiologie (KBVR)

Research paper thumbnail of Effect of field strength on gadolinium enhancement in MR imaging

Research paper thumbnail of “William Tell” Injury: MDCT of an Arrow Through the Head

American Journal of Roentgenology, 2004

Research paper thumbnail of Maxillo-facial trauma

JBR-BTR: organe de la Société royale belge de radiologie (SRBR) = orgaan van de Koninklijke Belgische Vereniging voor Radiologie (KBVR)

Injuries to the facial bones, orbits and adjacent soft tissue structures are common. Despite the ... more Injuries to the facial bones, orbits and adjacent soft tissue structures are common. Despite the increasing safety precautions in modern cars, facial injury is very often caused by motor vehicle accidents. Severe trauma to the face is a strong indication for radiological investigation. In the patient with maxillo-facial trauma, the radiological exploration of should answer two major questions: do the fractures involve areas that may alter the physiologic function of the sinuses, mouth, nasal vault or orbit?, and will the fracture result in any cosmetically detectable abnormality? The goal of the radiological work-up is to define the number and exact location of the fractures, to determine if there is any depression, elevation, or distraction of the fracture fragments, and to assess concomitant soft tissue complications. In this article, we review the role of clinical evaluation, plain X-rays, computed tomography (CT) and magnetic resonance imaging (MRI). Imaging findings are correla...

Research paper thumbnail of Review Article: MRI of the postoperative lumbar spine

Research paper thumbnail of Clinical usefulness of contrast-enhanced MP-RAGE of the brain

Neuroradiology, 1996

Our purpose was to evaluate the usefulness of a 3D T1-weighted gradient-echo sequence (MP-RAGE) i... more Our purpose was to evaluate the usefulness of a 3D T1-weighted gradient-echo sequence (MP-RAGE) in clinical practice. We prospectively examined 200 patients with a variety of neurological disorders and symptoms. We compared lesion conspicuity and contrast enhancement on MP-RAGE images with conventional gadolinium-enhanced spin-echo (SE) T1-weighted images. Both the original MP-RAGE data and the reformatted images were characterised by improved differentiation between grey and white matter. More lesions were found on the 3D series, in both patients with neoplastic and non-neoplastic disease. Contrast enhancement of small oedematous lesions affecting the white matter in demyelinating disease was less obvious. Multiplanar reformatting, which can be realised in any desired plane and surface rendering with sophisticated segmentation algorithms superbly displayed the underlying anatomical relationships between lesions and normal brain structures. Excellent spatial resolution, the absence of posterior fossa artefacts and equivalent contrast enhancement resulted in an increased number of space-occupying lesions being found on the MP-RAGE images. Thus contrast-enhanced MP-RAGE is an alternative to conventional SE imaging in the investigation of intracranial masses. Although the total number of lesions found in patients with demyelinating disease was significantly higher on MP-RAGE, demonstration of blood-brain-barrier breakdown in active lesions was less obvious.

Research paper thumbnail of Cortical hypoxic-ischemic brain damage in shaken-baby (shaken impact) syndrome: value of diffusion-weighted MRI

Pediatric Radiology, 2003

Research paper thumbnail of Spinal tumors

European Journal of Radiology, 2004

Spinal tumors are uncommon lesions but may cause significant morbidity in terms of limb dysfuncti... more Spinal tumors are uncommon lesions but may cause significant morbidity in terms of limb dysfunction. In establishing the differential diagnosis for a spinal lesion, location is the most important feature, but the clinical presentation and the patient's age and gender are also important. Magnetic resonance (MR) imaging plays a central role in the imaging of spinal tumors, easily allowing tumors to be classified as extradural, intradural-extramedullary or intramedullary, which is very useful in tumor characterization. In the evaluation of lesions of the osseous spine both computed tomography (CT) and MR are important.

Research paper thumbnail of Imaging findings in diffuse axonal injury after closed head trauma

Research paper thumbnail of Intracranial hemorrhage: principles of CT and MRI interpretation

European Radiology, 2001

Intracranial hemorrhage is a potentially life-threatening neurological condition. It results in a... more Intracranial hemorrhage is a potentially life-threatening neurological condition. It results in a significant burden on health care resources. Patient outcome is influenced by an early and accurate diagnosis. Radiological assessment of intracranial blood is challenging, due to the highly variable appearance of intracranial blood, depending on its age and location. It is therefore important to understand the underlying physical, biological, and biochemical factors of an evolving hematoma and to correlate them with the aspect on cross-sectional imaging techniques.

Research paper thumbnail of Distribution and incidence of degenerative spine changes in patients with a lumbo-sacral transitional vertebra

European Spine Journal, 1997

The purpose of this pro-

Research paper thumbnail of Understanding chemical shift induced boundary artefacts as a function of field strength: influence of imaging parameters (bandwidth, field-of-view, and matrix size)

European Journal of Radiology, 1994

Research paper thumbnail of Influence of Magnetic Field Strength on T2* Decay and Phase Effects in Gradient Echo MRI of Vertebral Bone Marrow

Journal of Computer Assisted Tomography, 1995

Research paper thumbnail of Magnetic resonance imaging of calcified thoracic disk herniation

European Journal of Radiology, 1993

Research paper thumbnail of Characterization of brain tumors

Neuroradiology plays an essential part in the clinical management of patients with brain tumors [... more Neuroradiology plays an essential part in the clinical management of patients with brain tumors [1]. Magnetic resonance imaging (MRI) and, to a lesser extent, computed tomography (CT) are the cornerstones for the diagnosis, definition of extent, detection of spread and follow-up of residual or recurrent tumor [2]. The purpose of this presentation is to discuss basic and advanced neuroradiological techniques that have been developed in the examination and management of patients with brain tumors. Until recently, neuroradiological techniques were used to characterize cerebral neoplasms by: • Definition of the exact tumor location (intra-or extra-axial, supra-or infratentorial) [3,4,5]; • Demonstration of anatomy in various planes; • Display of differences in tissue density (MDCT); • Display of differences in MRI signal intensity between normal and abnormal brain tissue; • Use of contrast media to demonstrate tumor vascularity (cerebral arteriography) or to detect breakdown of the bloo...

Research paper thumbnail of Headache: when is neuroimaging needed?

JBR-BTR: organe de la Société royale belge de radiologie (SRBR) = orgaan van de Koninklijke Belgische Vereniging voor Radiologie (KBVR)