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Article ; Online: Spinal cord ischemia revealed by a Brown-Sequard syndrome and caused by a calcified thoracic disc extrusion with spontaneous regression: a case report and review of the literature.

Petrovic, Sonja / Le Forestier, Nadine / Pradat, Pierre-François / Pascal-Moussellard, Hugues / Chougar, Lydia

2023 Volume 17, Issue 1, Page(s) 510

Abstract: Background: Thoracic disc herniation is relatively uncommon, accounting for less than 1% of all spinal herniations. Although most often asymptomatic, they may represent a rare cause of spinal cord ischemia.: Case report: We report the case of a ... ...

Abstract	Background: Thoracic disc herniation is relatively uncommon, accounting for less than 1% of all spinal herniations. Although most often asymptomatic, they may represent a rare cause of spinal cord ischemia. Case report: We report the case of a healthy 43-year-old North African male who presented with a Brown-Sequard syndrome revealing a spinal cord ischemia caused by a thoracic disc extrusion. The initial MRI revealed a calcified disc extrusion at the level of T5-T6 without significant spinal cord compression or signal abnormality. A pattern consistent with a medullary ischemia only appeared 48 h later. The patient was treated conservatively with Aspirin and Heparin, which were discontinued later because of a negative cardiovascular work-up. The calcified disc extrusion, which was later recognized as the cause of the ischemia, decreased spontaneously over time and the patient recovered within a few months. Conclusions: Our case highlights the challenge in diagnosing and managing this uncommon condition. We propose a literature review showing the different therapeutic strategies and their corresponding clinical outcomes.
MeSH term(s)	Humans ; Male ; Adult ; Brown-Sequard Syndrome/diagnostic imaging ; Brown-Sequard Syndrome/etiology ; Hernia ; Intervertebral Disc Displacement/complications ; Intervertebral Disc Displacement/diagnostic imaging ; Magnetic Resonance Imaging ; Spinal Cord Ischemia/complications ; Ischemia
Language	English
Publishing date	2023-11-29
Publishing country	England
Document type	Review ; Case Reports ; Journal Article
ZDB-ID	2269805-X
ISSN	1752-1947 ; 1752-1947
ISSN (online)	1752-1947
ISSN	1752-1947
DOI	10.1186/s13256-023-04208-1
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Article ; Online: Update on neuroimaging for categorization of Parkinson's disease and atypical parkinsonism.

Chougar, Lydia / Pyatigorskaya, Nadya / Lehéricy, Stéphane

Current opinion in neurology

2021 Volume 34, Issue 4, Page(s) 514–524

Abstract: Purpose of review: Differential diagnosis of Parkinsonism may be difficult. The objective of this review is to present the work of the last three years in the field of imaging for diagnostic categorization of parkinsonian syndromes focusing on ... ...

Abstract	Purpose of review: Differential diagnosis of Parkinsonism may be difficult. The objective of this review is to present the work of the last three years in the field of imaging for diagnostic categorization of parkinsonian syndromes focusing on progressive supranuclear palsy (PSP) and multiple system atrophy (MSA). Recent findings: Two main complementary approaches are being pursued. The first seeks to develop and validate manual qualitative or semi-quantitative imaging markers that can be easily used in clinical practice. The second is based on quantitative measurements of magnetic resonance imaging abnormalities integrated in a multimodal approach and in automatic categorization machine learning tools. Summary: These two complementary approaches obtained high diagnostic around 90% and above in the classical Richardson form of PSP and probable MSA. Future work will determine if these techniques can improve diagnosis in other PSP variants and early forms of the diseases when all clinical criteria are not fully met.
MeSH term(s)	Diagnosis, Differential ; Humans ; Magnetic Resonance Imaging ; Multiple System Atrophy/diagnostic imaging ; Neuroimaging ; Parkinson Disease/diagnostic imaging ; Parkinsonian Disorders/diagnostic imaging ; Supranuclear Palsy, Progressive/diagnostic imaging
Language	English
Publishing date	2021-05-19
Publishing country	England
Document type	Journal Article ; Review
ZDB-ID	1182686-1
ISSN	1473-6551 ; 1350-7540
ISSN (online)	1473-6551
ISSN	1350-7540
DOI	10.1097/WCO.0000000000000957
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Article ; Online: Spinal cord ischemia revealed by a Brown-Sequard syndrome and caused by a calcified thoracic disc extrusion with spontaneous regression

Sonja Petrovic / Nadine Le Forestier / Pierre-François Pradat / Hugues Pascal-Moussellard / Lydia Chougar

Journal of Medical Case Reports, Vol 17, Iss 1, Pp 1-

a case report and review of the literature

2023 Volume 6

Abstract: Abstract Background Thoracic disc herniation is relatively uncommon, accounting for less than 1% of all spinal herniations. Although most often asymptomatic, they may represent a rare cause of spinal cord ischemia. Case report We report the case of a ... ...

Abstract	Abstract Background Thoracic disc herniation is relatively uncommon, accounting for less than 1% of all spinal herniations. Although most often asymptomatic, they may represent a rare cause of spinal cord ischemia. Case report We report the case of a healthy 43-year-old North African male who presented with a Brown-Sequard syndrome revealing a spinal cord ischemia caused by a thoracic disc extrusion. The initial MRI revealed a calcified disc extrusion at the level of T5-T6 without significant spinal cord compression or signal abnormality. A pattern consistent with a medullary ischemia only appeared 48 h later. The patient was treated conservatively with Aspirin and Heparin, which were discontinued later because of a negative cardiovascular work-up. The calcified disc extrusion, which was later recognized as the cause of the ischemia, decreased spontaneously over time and the patient recovered within a few months. Conclusions Our case highlights the challenge in diagnosing and managing this uncommon condition. We propose a literature review showing the different therapeutic strategies and their corresponding clinical outcomes.
Keywords	Spinal cord ischemia ; Brown-Sequard syndrome ; Disc herniation ; Case report ; Medicine ; R
Subject code	610
Language	English
Publishing date	2023-11-01T00:00:00Z
Publisher	BMC
Document type	Article ; Online
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Article ; Online: Teaching brain imaging through a drawing method may improve learning in medical students.

Mathon, Bertrand / Chougar, Lydia / Carpentier, Alexandre / Amelot, Aymeric

European radiology

2020 Volume 31, Issue 6, Page(s) 4195–4202

Abstract: Objectives: Brain imaging is particularly difficult to learn and to teach. This study aimed to evaluate the performance of teaching brain imaging through drawing method in medical faculty students.: Methods: We conducted a prospective, interventional, ...

Abstract	Objectives: Brain imaging is particularly difficult to learn and to teach. This study aimed to evaluate the performance of teaching brain imaging through drawing method in medical faculty students. Methods: We conducted a prospective, interventional, randomized, single-blind study in third-year voluntary medical students between December 2016 and June 2019. Eighty medical students received a theoretical training on brain imaging interpretation and were subsequently randomized into two groups ("teaching through drawing" and "standard teaching"). An initial evaluation was carried out to assess the students' basic level. Three teaching and training sessions were spread over 2 months in each group. One month after the third teaching session, students were evaluated by an examiner who was blind to the student's group. The same comprehensive evaluation grid has been used for the initial and final students' evaluations to give an objective score out of 20 points. Students' scores were compared between groups using the t test and effect sizes were measured using Cohen's d. Results: Students' mean age was 21.1 years old. In total, 61.3% were female. Regarding initial evaluation, scores did not differ significantly between both groups (10.1 ± 2.0 versus 9.9 ± 1.9, p = 0.65), thus confirming the homogeneity of the students' basic level. The scores obtained from the final evaluation were significantly higher for the "teaching through drawing" students than for the "standard teaching" students (14.7 ± 2.7 vs 13.2 ± 2.0, p = 0.009, Cohen's d = 0.62). Conclusions: This study provides class II evidence that the method of drawing alone can improve brain imaging comprehension and analysis in medical faculty students. Key points: • The method of drawing can improve brain imaging analysis in medical faculty students. • A large majority of students were satisfied by the method of brain imaging teaching through drawing.
MeSH term(s)	Adult ; Education, Medical, Undergraduate ; Educational Measurement ; Female ; Humans ; Male ; Neuroimaging ; Prospective Studies ; Single-Blind Method ; Students, Medical ; Teaching ; Young Adult
Language	English
Publishing date	2020-11-17
Publishing country	Germany
Document type	Journal Article ; Randomized Controlled Trial
ZDB-ID	1085366-2
ISSN	1432-1084 ; 0938-7994 ; 1613-3749
ISSN (online)	1432-1084
ISSN	0938-7994 ; 1613-3749
DOI	10.1007/s00330-020-07484-3
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Article ; Online: Contribution of MRI for the Early Diagnosis of Parkinsonism in Patients with Diagnostic Uncertainty.

Chougar, Lydia / Faucher, Alice / Faouzi, Johann / Lejeune, François-Xavier / Gama Lobo, Gonçalo / Jovanovic, Carna / Cormier, Florence / Dupont, Gwendoline / Vidailhet, Marie / Corvol, Jean-Christophe / Colliot, Olivier / Lehéricy, Stéphane / Grabli, David / Degos, Bertrand

Movement disorders : official journal of the Movement Disorder Society

2024

Abstract: Background: International clinical criteria are the reference for the diagnosis of degenerative parkinsonism in clinical research, but they may lack sensitivity and specificity in the early stages.: Objectives: To determine whether magnetic resonance ...

Abstract	Background: International clinical criteria are the reference for the diagnosis of degenerative parkinsonism in clinical research, but they may lack sensitivity and specificity in the early stages. Objectives: To determine whether magnetic resonance imaging (MRI) analysis, through visual reading or machine-learning approaches, improves diagnostic accuracy compared with clinical diagnosis at an early stage in patients referred for suspected degenerative parkinsonism. Materials: Patients with initial diagnostic uncertainty between Parkinson's disease (PD), progressive supranuclear palsy (PSP), and multisystem atrophy (MSA), with brain MRI performed at the initial visit (V1) and available 2-year follow-up (V2), were included. We evaluated the accuracy of the diagnosis established based on: (1) the international clinical diagnostic criteria for PD, PSP, and MSA at V1 ("Clin1"); (2) MRI visual reading blinded to the clinical diagnosis ("MRI"); (3) both MRI visual reading and clinical criteria at V1 ("MRI and Clin1"), and (4) a machine-learning algorithm ("Algorithm"). The gold standard diagnosis was established by expert consensus after a 2-year follow-up. Results: We recruited 113 patients (53 with PD, 31 with PSP, and 29 with MSA). Considering the whole population, compared with clinical criteria at the initial visit ("Clin1": balanced accuracy, 66.2%), MRI visual reading showed a diagnostic gain of 14.3% ("MRI": 80.5%; P = 0.01), increasing to 19.2% when combined with the clinical diagnosis at the initial visit ("MRI and Clin1": 85.4%; P < 0.0001). The algorithm achieved a diagnostic gain of 9.9% ("Algorithm": 76.1%; P = 0.08). Conclusion: Our study shows the use of MRI analysis, whether by visual reading or machine-learning methods, for early differentiation of parkinsonism. © 2024 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society.
Language	English
Publishing date	2024-03-14
Publishing country	United States
Document type	Journal Article
ZDB-ID	607633-6
ISSN	1531-8257 ; 0885-3185
ISSN (online)	1531-8257
ISSN	0885-3185
DOI	10.1002/mds.29760
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Article: The Role of Magnetic Resonance Imaging for the Diagnosis of Atypical Parkinsonism.

Chougar, Lydia / Pyatigorskaya, Nadya / Degos, Bertrand / Grabli, David / Lehéricy, Stéphane

Frontiers in neurology

2020 Volume 11, Page(s) 665

Abstract: The diagnosis of Parkinson's disease and atypical Parkinsonism remains clinically difficult, especially at the early stage of the disease, since there is a significant overlap of symptoms. Multimodal MRI has significantly improved diagnostic accuracy and ...

Abstract	The diagnosis of Parkinson's disease and atypical Parkinsonism remains clinically difficult, especially at the early stage of the disease, since there is a significant overlap of symptoms. Multimodal MRI has significantly improved diagnostic accuracy and understanding of the pathophysiology of Parkinsonian disorders. Structural and quantitative MRI sequences provide biomarkers sensitive to different tissue properties that detect abnormalities specific to each disease and contribute to the diagnosis. Machine learning techniques using these MRI biomarkers can effectively differentiate atypical Parkinsonian syndromes. Such approaches could be implemented in a clinical environment and improve the management of Parkinsonian patients. This review presents different structural and quantitative MRI techniques, their contribution to the differential diagnosis of atypical Parkinsonian disorders and their interest for individual-level diagnosis.
Language	English
Publishing date	2020-07-17
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	2564214-5
ISSN	1664-2295
ISSN	1664-2295
DOI	10.3389/fneur.2020.00665
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Article ; Online: Comparison of mean diffusivity, R2* relaxation rate and morphometric biomarkers for the clinical differentiation of parkinsonism.

Chougar, Lydia / Lejeune, François-Xavier / Faouzi, Johann / Morino, Benjamin / Faucher, Alice / Hoyek, Nadine / Grabli, David / Cormier, Florence / Vidailhet, Marie / Corvol, Jean-Christophe / Colliot, Olivier / Degos, Bertrand / Lehéricy, Stéphane

Parkinsonism & related disorders

2023 Volume 108, Page(s) 105287

Abstract: Introduction: Quantitative biomarkers for clinical differentiation of parkinsonian syndromes are still lacking. Our aim was to evaluate the value of combining clinically feasible manual measurements of R2* relaxation rates and mean diffusivity (MD) in ... ...

Abstract	Introduction: Quantitative biomarkers for clinical differentiation of parkinsonian syndromes are still lacking. Our aim was to evaluate the value of combining clinically feasible manual measurements of R2* relaxation rates and mean diffusivity (MD) in subcortical regions and brainstem morphometric measurements to improve the discrimination of parkinsonian syndromes. Methods: Twenty-two healthy controls (HC), 25 patients with Parkinson's disease (PD), 19 with progressive supranuclear palsy (PSP) and 27 with multiple system atrophy (MSA, 21 with the parkinsonian variant -MSAp, 6 with the cerebellar variant -MSAc) were recruited. R2, MD measurements and morphometric biomarkers including the midbrain to pons area ratio and the Magnetic Resonance Parkinsonism Index (MRPI) were compared between groups and their diagnostic performances were assessed. Results:* Morphometric biomarkers discriminated better patients with PSP (ratio: AUC 0.89, MRPI: AUC 0.89) and MSAc (ratio: AUC 0.82, MRPI: AUC 0.75) from other groups. R2* and MD measurements in the posterior putamen performed better in separating patients with MSAp from PD (R2: AUC 0.89; MD: AUC 0.89). For the three-class classification "MSA vs PD vs PSP", the combination of MD and R2 measurements in the posterior putamen with morphometric biomarkers (AUC: 0.841) outperformed each marker separately. At the individual-level, there were seven discordances between imaging-based prediction and clinical diagnosis involving MSA. Using the new Movement Disorder Society criteria for the diagnosis of MSA, three of these seven patients were clinically reclassified as predicted by quantitative imaging. Conclusion: Combining R2* and MD measurements in the posterior putamen with morphometric biomarkers improves the discrimination of parkinsonism.
MeSH term(s)	Humans ; Parkinsonian Disorders/pathology ; Parkinson Disease ; Supranuclear Palsy, Progressive/pathology ; Diffusion Magnetic Resonance Imaging ; Brain Stem/pathology ; Multiple System Atrophy/pathology ; Magnetic Resonance Imaging/methods ; Diagnosis, Differential
Language	English
Publishing date	2023-01-18
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1311489-x
ISSN	1873-5126 ; 1353-8020
ISSN (online)	1873-5126
ISSN	1353-8020
DOI	10.1016/j.parkreldis.2023.105287
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Zs.A 4553: Show issues			Location: Je nach Verfügbarkeit (siehe Angabe bei Bestand) bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular Jg. 1995 - 2021: Lesesall (2.OG) ab Jg. 2022: Lesesaal (EG)
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Article ; Online: Neuromelanin-Sensitive Magnetic Resonance Imaging Changes in the Locus Coeruleus/Subcoeruleus Complex in Patients with Typical and Atypical Parkinsonism.

Nobileau, Alexis / Gaurav, Rahul / Chougar, Lydia / Faucher, Alice / Valabrègue, Romain / Mangone, Graziella / Leu-Semenescu, Smaranda / Lejeune, François-Xavier / Corvol, Jean-Christophe / Arnulf, Isabelle / Vidailhet, Marie / Grabli, David / Degos, Bertrand / Lehéricy, Stéphane

Movement disorders : official journal of the Movement Disorder Society

2023 Volume 38, Issue 3, Page(s) 479–484

Abstract: Background: The locus coeruleus/subcoeruleus complex (LC/LsC) is a structure comprising melanized noradrenergic neurons.: Objective: To study the LC/LsC damage across Parkinson's disease (PD) and atypical parkinsonism in a large group of subjects.: ...

Abstract	Background: The locus coeruleus/subcoeruleus complex (LC/LsC) is a structure comprising melanized noradrenergic neurons. Objective: To study the LC/LsC damage across Parkinson's disease (PD) and atypical parkinsonism in a large group of subjects. Methods: We studied 98 healthy control subjects, 47 patients with isolated rapid eye movement sleep behavior disorder (RBD), 75 patients with PD plus RBD, 142 patients with PD without RBD, 19 patients with progressive supranuclear palsy (PSP), and 19 patients with multiple system atrophy (MSA). Twelve patients with MSA had proven RBD. LC/LsC signal intensity was derived from neuromelanin magnetic resonance imaging using automated software. Results: The signal intensity was reduced in all parkinsonian syndromes compared with healthy control subjects, except in PD without RBD. The signal intensity decreased as age increased. Moreover, the signal intensity was lower in MSA than in isolated RBD and PD without RBD groups. In PD, the signal intensity correlated negatively with the percentage of REM sleep without atonia. There were no differences in signal intensity between PD plus RBD, PSP, and MSA. Conclusions: Neuromelanin signal intensity was reduced in all parkinsonian disorders, except in PD without RBD. The presence of RBD in parkinsonian disorders appears to be associated with lower neuromelanin signal intensity. Furthermore, lower LC/LsC signal changes in PSP could be partly caused by the effect of age. © 2023 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society.
MeSH term(s)	Humans ; Locus Coeruleus/diagnostic imaging ; Locus Coeruleus/pathology ; Parkinsonian Disorders/complications ; Parkinson Disease/complications ; Parkinson Disease/diagnostic imaging ; Parkinson Disease/pathology ; Supranuclear Palsy, Progressive/pathology ; Multiple System Atrophy/pathology ; Magnetic Resonance Imaging/methods
Chemical Substances	neuromelanin
Language	English
Publishing date	2023-01-02
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	607633-6
ISSN	1531-8257 ; 0885-3185
ISSN (online)	1531-8257
ISSN	0885-3185
DOI	10.1002/mds.29309
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Article ; Online: Synthetic MRI of the knee: new perspectives in musculoskeletal imaging and possible applications for the assessment of bone marrow disorders.

Chougar, Lydia / Hagiwara, Akifumi / Andica, Christina / Hori, Masaaki / Aoki, Shigeki

The British journal of radiology

2018 Volume 91, Issue 1085, Page(s) 20170886

MeSH term(s)	Bone Marrow ; Bone Marrow Diseases ; Humans ; Knee ; Knee Joint ; Magnetic Resonance Imaging
Language	English
Publishing date	2018-01-15
Publishing country	England
Document type	Letter ; Comment
ZDB-ID	2982-8
ISSN	1748-880X ; 0007-1285
ISSN (online)	1748-880X
ISSN	0007-1285
DOI	10.1259/bjr.20170886
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Article ; Online: Long-Term Middle Meningeal Artery Caliber Reduction Following Trisacryl Gelatine Microsphere Embolization for the Treatment of Chronic Subdural Hematoma.

Shotar, Eimad / Barberis, Eric / Chougar, Lydia / Bensoussan, Sacha / Parat, Damien / Ghannouchi, Haroun / Premat, Kevin / Lenck, Stephanie / Degos, Vincent / Lehericy, Stéphane / Sourour, Nader-Antoine / Mathon, Bertrand / Clarençon, Frédéric

Clinical neuroradiology

2022 Volume 33, Issue 1, Page(s) 113–120

Abstract: Purpose: Middle meningeal artery (MMA) particle embolization is a promising treatment of chronic subdural hematomas (CSDH). The main purpose of this study is to measure MMA proximal caliber and assess the visibility of the two main MMA branches as a ... ...

Abstract	Purpose: Middle meningeal artery (MMA) particle embolization is a promising treatment of chronic subdural hematomas (CSDH). The main purpose of this study is to measure MMA proximal caliber and assess the visibility of the two main MMA branches as a surrogate for long-term distal arterial patency following MMA CSDH embolization with trisacryl gelatine microspheres (TAGM). Methods: This is a single-center retrospective study. All patients having undergone MMA TAGM only embolization for CSDH treatment between 15 March 2018 and 6 June 2020 with an interpretable follow-up magnetic resonance imaging (MRI) examination and no confounding factors were included. Patients were compared with controls matched for age, sex and MRI machine. Two independent readers analyzed the MRI images. Results: In this study, 30 patients having undergone embolization procedures using TAGM of 36 MMAs were included. The follow-up MRI scans were performed after a mean delay of 14.8 ± 7.1 months (range 4.9-29.4 months). The mean diameter of TAGM embolized MMAs (1 mm; 95% confidence interval, CI 0.9-1.1) was significantly smaller than the mean diameter of paired control MMAs (1.3 mm; 95% CI 1.3-1.4) (p < 0.001). The mean proximal diameter of the embolized MMAs (0.9 mm; 95% CI 0.7-1.1) was significantly smaller than the mean diameter of the contralateral MMAs in the same patients (1.4 mm; 95% CI 1.3-1.6)(p < 0.001). Conclusion: Long-term follow-up MRI demonstrated a significant impact of TAGM embolization on MMA proximal caliber as well as on the visibility of the two main MMA branches. All comparisons indicated that there was a probable lasting impact of embolization on the patency of distal branches.
MeSH term(s)	Humans ; Meningeal Arteries/diagnostic imaging ; Hematoma, Subdural, Chronic/diagnostic imaging ; Hematoma, Subdural, Chronic/therapy ; Hematoma, Subdural, Chronic/pathology ; Retrospective Studies ; Microspheres ; Embolization, Therapeutic/methods
Language	English
Publishing date	2022-07-07
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2234662-4
ISSN	1869-1447 ; 0939-7116 ; 1869-1439
ISSN (online)	1869-1447
ISSN	0939-7116 ; 1869-1439
DOI	10.1007/s00062-022-01189-4
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