1
|
Ang T, Lim W, Chaggar V, Patel S, Selva D. Radiological differentiation between bacterial orbital cellulitis and invasive fungal sino-orbital infections. Int Ophthalmol 2024; 44:319. [PMID: 38976107 PMCID: PMC11230958 DOI: 10.1007/s10792-024-03241-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2024] [Accepted: 06/26/2024] [Indexed: 07/09/2024]
Abstract
PURPOSE Invasive fungal orbital infections (IFOI) may be difficult to differentiate from sinogenic bacterial orbital cellulitis (OC). This study investigates the features differentiating OC from IFOI on magnetic resonance imaging (MRI). METHODS Retrospective study of adult patients with sinogenic OC and IFOI with pre-intervention MRI. Patients without post-septal involvement, non-sinogenic OC (e.g.: secondary to trauma) and poor-quality scans were excluded. Independent Sample's t test and Fisher's exact test were conducted with p < 0.05 deemed statistically significant. RESULTS Eleven cases each of OC (Mean age: 41.6 ± 18.4 years-old, Male: 10) and IFOI (Mean age: 65.0 ± 16.6 years-old, Male: 9) between 2006 and 2023. IFOI patients were older, more likely immunocompromised and had a lower mean white-cell count (p value = 0.005, 0.035 and 0.017, respectively). The ethmoid and maxillary sinuses were most commonly involved in both entities. Pre-septal and lacrimal gland involvement were more common in OC (p = 0.001 and 0.008, respectively). Infiltrative OC orbital lesions were poorly demarcated, whilst those in IFOI were expansile/mass-like invading the orbit from the adjacent paranasal sinuses. Specific IFOI features included loss-of-contrast-enhancement (LoCE) of paranasal sinus tissues with orbital extension. Extra-orbital and -sinonasal extension indicative of IFOI included contiguous skull base or pterygopalatine fossa involvement, retro-antral and masticator space stranding and vasculitis. CONCLUSION This study describes the key MRI features of IFOI including differentiating markers from OC. These specific features, such as LoCE of the paranasal and orbital soft tissues, the location and pattern of contiguous soft-tissue involvement, provide expedient identification of IFOI which necessitate early surgical intervention for microbiological confirmation of an invasive fungal pathology.
Collapse
Affiliation(s)
- Terence Ang
- The University of Adelaide, Adelaide, SA, Australia.
- Department of Ophthalmology, The Royal Adelaide Hospital, Adelaide, SA, 5000, Australia.
| | - Wanyin Lim
- The University of Adelaide, Adelaide, SA, Australia
- Department of Medical Imaging, The Royal Adelaide Hospital, Adelaide, SA, Australia
- Jones Radiology, Adelaide, SA, Australia
| | | | - Sandy Patel
- Department of Medical Imaging, The Royal Adelaide Hospital, Adelaide, SA, Australia
- Jones Radiology, Adelaide, SA, Australia
| | - Dinesh Selva
- The University of Adelaide, Adelaide, SA, Australia
- Department of Ophthalmology, The Royal Adelaide Hospital, Adelaide, SA, 5000, Australia
| |
Collapse
|
2
|
Chaganti SS, Sidhom G, Chaganti J. Multiparametric imaging in the evaluation of intracerebral abscesses. Pract Neurol 2023; 23:376-385. [PMID: 37248041 DOI: 10.1136/pn-2023-003694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/01/2023] [Indexed: 05/31/2023]
Abstract
Cerebral abscesses are uncommon space occupying lesions; they are associated with high morbidity and mortality, though are potentially treatable. Patients often present with non-specific symptoms and may have few clinical signs. Routine clinical imaging may not give a definite diagnosis, as the findings can be indistinguishable from those of other intracranial mass lesions. We review the role of advanced MR techniques to characterise brain abscesses and discuss the role of imaging in monitoring their response to the treatment.
Collapse
Affiliation(s)
- Sai Sivananda Chaganti
- Fellow, Department of Neurology, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
| | - George Sidhom
- Department of Radiology, St Vincent's Health Australia Ltd, Sydney, New South Wales, Australia
| | - Joga Chaganti
- Department of Radiology, St Vincent's Health Australia Ltd, Sydney, New South Wales, Australia
- Department of Radiology, St Vincent's Hospital Sydney, Sydney, New South Wales, Australia
| |
Collapse
|
3
|
Singh M, Zaita BM, Singh D, Singh A, Kaur G. Sphenoid Sinus Aspergilloma in an Immunocompetent and an Immunocompromised Patient: A Case Report. Cureus 2023; 15:e34517. [PMID: 36879700 PMCID: PMC9984281 DOI: 10.7759/cureus.34517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/01/2023] [Indexed: 02/04/2023] Open
Abstract
Sellar, supra-sellar aspergilloma are rare differentials for a sellar mass. CNS aspergilloma occurs due to intracranial extension of invasive fungal sinusitis, and often first manifests with symptoms of headache and visual disturbance. This complication is much more common in immunocompromised patients, but proliferation of fungal pathogens and low index for suspicion has led to more severe breakthrough cases in the immunocompetent. If treated timely, these CNS lesions can have a relatively good prognosis. Conversely, delays in diagnosis can confer very high rates of mortality among patients with invasive fungal disease. Originally from India, in this case report, we describe two patients presenting with sellar, supra-sellar tumors, who eventually were diagnosed with confirmed cases of invasive intracranial aspergilloma. We describe the clinical presentation, imaging techniques, and treatment modalities for this relatively rare disease in both the immunocompromised and the immunocompetent.
Collapse
Affiliation(s)
- Manraj Singh
- Department of Basic Biomedical Sciences, Dayanand Medical College and Hospital, Ludhiana, IND
| | - Brittany M Zaita
- Department of Basic Biomedical Sciences, Touro College of Osteopathic Medicine, Middletown, USA
| | - Deepinder Singh
- Department of Neurosurgery, Satguru Partap Singh (S.P.S. Hospital, Ludhiana, IND
| | - Adityabikram Singh
- Department of Basic Biomedical Sciences, Rutgers University New Jersey Medical School, Newark, USA
| | - Gurjinder Kaur
- Department of Physiology, Touro College of Osteopathic Medicine, Middletown, USA
| |
Collapse
|
4
|
Application of susceptibility weighted imaging (SWI) in diagnostic imaging of brain pathologies – a practical approach. Clin Neurol Neurosurg 2022; 221:107368. [DOI: 10.1016/j.clineuro.2022.107368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 07/03/2022] [Accepted: 07/12/2022] [Indexed: 11/24/2022]
|
5
|
Luckowitsch M, Rudolph H, Bochennek K, Porto L, Lehrnbecher T. Central Nervous System Mold Infections in Children with Hematological Malignancies: Advances in Diagnosis and Treatment. J Fungi (Basel) 2021; 7:168. [PMID: 33652605 PMCID: PMC7996787 DOI: 10.3390/jof7030168] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 02/21/2021] [Accepted: 02/22/2021] [Indexed: 12/11/2022] Open
Abstract
The incidence of invasive mold disease (IMD) has significantly increased over the last decades, and IMD of the central nervous system (CNS) is a particularly severe form of this infection. Solid data on the incidence of CNS IMD in the pediatric setting are lacking, in which Aspergillus spp. is the most prevalent pathogen, followed by mucorales. CNS IMD is difficult to diagnose, and although imaging tools such as magnetic resonance imaging have considerably improved, these techniques are still unspecific. As microscopy and culture have a low sensitivity, non-culture-based assays such as the detection of fungal antigens (e.g., galactomannan or beta-D-glucan) or the detection of fungal nucleic acids by molecular assays need to be validated in children with suspected CNS IMD. New and potent antifungal compounds helped to improve outcome of CNS IMD, but not all agents are approved for children and a pediatric dosage has not been established. Therefore, studies have to rapidly evaluate dosage, safety and efficacy of antifungal compounds in the pediatric setting. This review will summarize the current knowledge on diagnostic tools and on the management of CNS IMD with a focus on pediatric patients.
Collapse
Affiliation(s)
- Marie Luckowitsch
- Division of Pediatric Hematology and Oncology, Hospital for Children and Adolescents, University Hospital Frankfurt, Goethe University, 60590 Frankfurt am Main, Germany; (M.L.); (H.R.); (K.B.)
| | - Henriette Rudolph
- Division of Pediatric Hematology and Oncology, Hospital for Children and Adolescents, University Hospital Frankfurt, Goethe University, 60590 Frankfurt am Main, Germany; (M.L.); (H.R.); (K.B.)
| | - Konrad Bochennek
- Division of Pediatric Hematology and Oncology, Hospital for Children and Adolescents, University Hospital Frankfurt, Goethe University, 60590 Frankfurt am Main, Germany; (M.L.); (H.R.); (K.B.)
| | - Luciana Porto
- Institute for Neuroradiology, University Hospital Frankfurt, Goethe University, 60590 Frankfurt am Main, Germany;
| | - Thomas Lehrnbecher
- Division of Pediatric Hematology and Oncology, Hospital for Children and Adolescents, University Hospital Frankfurt, Goethe University, 60590 Frankfurt am Main, Germany; (M.L.); (H.R.); (K.B.)
| |
Collapse
|
6
|
Haller S, Haacke EM, Thurnher MM, Barkhof F. Susceptibility-weighted Imaging: Technical Essentials and Clinical Neurologic Applications. Radiology 2021; 299:3-26. [PMID: 33620291 DOI: 10.1148/radiol.2021203071] [Citation(s) in RCA: 97] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Susceptibility-weighted imaging (SWI) evolved from simple two-dimensional T2*-weighted sequences to three-dimensional sequences with improved spatial resolution and enhanced susceptibility contrast. SWI is an MRI sequence sensitive to compounds that distort the local magnetic field (eg, calcium and iron), in which the phase information can differentiate. But the term SWI is colloquially used to denote high-spatial-resolution susceptibility-enhanced sequences across different MRI vendors and sequences even when phase information is not used. The imaging appearance of SWI and related sequences strongly depends on the acquisition technique. Initially, SWI and related sequences were mostly used to improve the depiction of findings already known from standard two-dimensional T2*-weighted neuroimaging: more microbleeds in patients who are aging or with dementia or mild brain trauma; increased conspicuity of superficial siderosis in Alzheimer disease and amyloid angiopathy; and iron deposition in neurodegenerative diseases or abnormal vascular structures, such as capillary telangiectasia. But SWI also helps to identify findings not visible on standard T2*-weighted images: the nigrosome 1 in Parkinson disease and dementia with Lewy bodies, the central vein and peripheral rim signs in multiple sclerosis, the peripheral rim sign in abscesses, arterial signal loss related to thrombus, asymmetrically prominent cortical veins in stroke, and intratumoral susceptibility signals in brain neoplasms.
Collapse
Affiliation(s)
- Sven Haller
- From the CIRD Centre d'Imagerie Rive Droite, Geneva, Switzerland (S.H.); Faculty of Medicine of the University of Geneva, Geneva, Switzerland (S.H.); Department of Surgical Sciences, Division of Radiology, Uppsala University, Uppsala, Sweden (S.H.); CIMC Centre d'Imagerie Médicale de Cornavin, Geneva, Switzerland (S.H.) Departments of Neurology and Radiology, Wayne State University, Detroit, Mich (E.M.H.); Department of Biomedical Imaging and Image-guided Therapy, Medical University Vienna, Vienna, Austria (M.M.T.); Queen Square Institute of Neurology, University College London, London, England (F.B.); Centre for Medical Image Computing (CMIC), Institute of Healthcare Engineering, University College London, London, England (F.B.); and Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centre, Amsterdam, the Netherlands (F.B.)
| | - E Mark Haacke
- From the CIRD Centre d'Imagerie Rive Droite, Geneva, Switzerland (S.H.); Faculty of Medicine of the University of Geneva, Geneva, Switzerland (S.H.); Department of Surgical Sciences, Division of Radiology, Uppsala University, Uppsala, Sweden (S.H.); CIMC Centre d'Imagerie Médicale de Cornavin, Geneva, Switzerland (S.H.) Departments of Neurology and Radiology, Wayne State University, Detroit, Mich (E.M.H.); Department of Biomedical Imaging and Image-guided Therapy, Medical University Vienna, Vienna, Austria (M.M.T.); Queen Square Institute of Neurology, University College London, London, England (F.B.); Centre for Medical Image Computing (CMIC), Institute of Healthcare Engineering, University College London, London, England (F.B.); and Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centre, Amsterdam, the Netherlands (F.B.)
| | - Majda M Thurnher
- From the CIRD Centre d'Imagerie Rive Droite, Geneva, Switzerland (S.H.); Faculty of Medicine of the University of Geneva, Geneva, Switzerland (S.H.); Department of Surgical Sciences, Division of Radiology, Uppsala University, Uppsala, Sweden (S.H.); CIMC Centre d'Imagerie Médicale de Cornavin, Geneva, Switzerland (S.H.) Departments of Neurology and Radiology, Wayne State University, Detroit, Mich (E.M.H.); Department of Biomedical Imaging and Image-guided Therapy, Medical University Vienna, Vienna, Austria (M.M.T.); Queen Square Institute of Neurology, University College London, London, England (F.B.); Centre for Medical Image Computing (CMIC), Institute of Healthcare Engineering, University College London, London, England (F.B.); and Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centre, Amsterdam, the Netherlands (F.B.)
| | - Frederik Barkhof
- From the CIRD Centre d'Imagerie Rive Droite, Geneva, Switzerland (S.H.); Faculty of Medicine of the University of Geneva, Geneva, Switzerland (S.H.); Department of Surgical Sciences, Division of Radiology, Uppsala University, Uppsala, Sweden (S.H.); CIMC Centre d'Imagerie Médicale de Cornavin, Geneva, Switzerland (S.H.) Departments of Neurology and Radiology, Wayne State University, Detroit, Mich (E.M.H.); Department of Biomedical Imaging and Image-guided Therapy, Medical University Vienna, Vienna, Austria (M.M.T.); Queen Square Institute of Neurology, University College London, London, England (F.B.); Centre for Medical Image Computing (CMIC), Institute of Healthcare Engineering, University College London, London, England (F.B.); and Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centre, Amsterdam, the Netherlands (F.B.)
| |
Collapse
|
7
|
Porto L, You SJ, Attarbaschi A, Cario G, Döring M, Moser O, Mücke U, Poyer F, Temme C, Voigt S, Groll AH, Lauten M, Hattingen E, Lehrnbecher T. Invasive Mold Infection of the Central Nervous System in Immunocompromised Children. J Fungi (Basel) 2020; 6:jof6040226. [PMID: 33081142 PMCID: PMC7711511 DOI: 10.3390/jof6040226] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 10/12/2020] [Accepted: 10/14/2020] [Indexed: 11/30/2022] Open
Abstract
Background: Due to the difficulties in the definite diagnosis, data on brain imaging in pediatric patients with central nervous system (CNS)-invasive mold infection (IMD) are scarce. Our aim was to describe brain imaging abnormalities seen in immunocompromised children with CNS-IMD, and to analyze retrospectively whether specific imaging findings and sequences have a prognostic value. Methods: In a retrospective study of 19 pediatric patients with proven or probable CNS-IMD, magnetic resonance imaging (MRI)-findings were described and analyzed. The results were correlated with outcome, namely death, severe sequelae, or no neurological sequelae. Results: 11 children and 8 adolescents (11/8 with proven/probable CNS-IMD) were included. Seven of the patients died and 12/19 children survived (63%): seven without major neurological sequelae and five with major neurological sequelae. Multifocal ring enhancement and diffusion restriction were the most common brain MRI changes. Diffusion restriction was mostly seen at the core of the lesion. No patient with disease limited to one lobe died. Perivascular microbleeding seen on susceptibility weighted imaging (SWI) and/or gradient-echo/T2* images, as well as infarction, were associated with poor prognosis. Conclusions: The presence of infarction was related to poor outcome. As early microbleeding seems to be associated with poor prognosis, we suggest including SWI in routine diagnostic evaluation of immunocompromised children with suspected CNS-IMD.
Collapse
Affiliation(s)
- Luciana Porto
- Department of Neuroradiology, University of Frankfurt, 60528 Frankfurt, Germany; (S.-J.Y.); (E.H.)
- Correspondence: ; Tel.: +49-696-301-5462; Fax: 49-696-301-7176
| | - Se-Jong You
- Department of Neuroradiology, University of Frankfurt, 60528 Frankfurt, Germany; (S.-J.Y.); (E.H.)
| | - Andishe Attarbaschi
- Department of Pediatrics and Adolescent Medicine, St. Anna Children’s Hospital, Medical University of Vienna, Pediatric Hematology and Oncology, 1090 Vienna, Austria; (A.A.); (F.P.)
| | - Gunnar Cario
- Department of Paediatrics, Pediatric Hematology and Oncology, Christian Albrechts University Kiel, 24118 Kiel, Germany;
| | - Michaela Döring
- Department of Paediatric Haematology and Oncology, University Children’s Hospital Tübingen, 53424 Tübingen, Germany;
| | - Olga Moser
- Department of Paediatrics, University Hospital Aachen, 52056 Aachen, Germany;
| | - Urs Mücke
- Department of Paediatric Haematology and Oncology, Hannover Medical School, 30625 Hannover, Germany;
| | - Fiona Poyer
- Department of Pediatrics and Adolescent Medicine, St. Anna Children’s Hospital, Medical University of Vienna, Pediatric Hematology and Oncology, 1090 Vienna, Austria; (A.A.); (F.P.)
| | - Christian Temme
- Department of Paediatric Haematology and Oncology, University Hospital Essen, 45147 Essen, Germany;
| | - Sebastian Voigt
- Department of Paediatric Haematology and Oncology, University Hospital Charité Berlin, 10117 Berlin, Germany;
| | - Andreas H. Groll
- Department of Infectious Disease Research, Center for Bone Marrow Transplantation and Department of Pediatric Hematology/Oncology, University Children’s Hospital Münster, 53424 Münster, Germany;
| | - Melchior Lauten
- Department of Paediatrics, Paediatric Haematology and Oncology, University of Lübeck, 23562 Lübeck, Germany;
| | - Elke Hattingen
- Department of Neuroradiology, University of Frankfurt, 60528 Frankfurt, Germany; (S.-J.Y.); (E.H.)
| | - Thomas Lehrnbecher
- Department of Pediatric Hematology and Oncology, Hospital for Children and Adolescents, University of Frankfurt, 60528 Frankfurt, Germany;
| |
Collapse
|
8
|
Simultaneous feedback control for joint field and motion correction in brain MRI. Neuroimage 2020; 226:117286. [PMID: 32992003 DOI: 10.1016/j.neuroimage.2020.117286] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 07/21/2020] [Accepted: 08/14/2020] [Indexed: 11/23/2022] Open
Abstract
T2*-weighted gradient-echo sequences count among the most widely used techniques in neuroimaging and offer rich magnitude and phase contrast. The susceptibility effects underlying this contrast scale with B0, making T2*-weighted imaging particularly interesting at high field. High field also benefits baseline sensitivity and thus facilitates high-resolution studies. However, enhanced susceptibility effects and high target resolution come with inherent challenges. Relying on long echo times, T2*-weighted imaging not only benefits from enhanced local susceptibility effects but also suffers from increased field fluctuations due to moving body parts and breathing. High resolution, in turn, renders neuroimaging particularly vulnerable to motion of the head. This work reports the implementation and characterization of a system that aims to jointly address these issues. It is based on the simultaneous operation of two control loops, one for field stabilization and one for motion correction. The key challenge with this approach is that the two loops both operate on the magnetic field in the imaging volume and are thus prone to mutual interference and potential instability. This issue is addressed at the levels of sensing, timing, and control parameters. Performance assessment shows the resulting system to be stable and exhibit adequate loop decoupling, precision, and bandwidth. Simultaneous field and motion control is then demonstrated in examples of T2*-weighted in vivo imaging at 7T.
Collapse
|
9
|
Cerebral abscesses imaging: A practical approach. JOURNAL OF POPULATION THERAPEUTICS AND CLINICAL PHARMACOLOGY 2020; 27:e11-e24. [PMID: 32757543 DOI: 10.15586/jptcp.v27i3.688] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 05/29/2020] [Indexed: 11/18/2022]
Abstract
Brain abscesses (BAs) are focal infections of the central nervous system (CNS) that start as a localised area of weakening of the brain parenchyma (cerebritis) and develops into a collection of pus surrounded by a capsule. Pyogenic (bacterial) BAs represent the majority of all BAs; in some cases, the diagnostic and therapeutic management can be challenging. Imaging has a primary role in differentiating BAs from other lesions. Conventional magnetic resonance imaging (cMRI) is essential for the identification of the lesion, its localisation and its morphological features. However, cMRI does not allow to reliably differentiate BAs from other intracranial mass lesions such as necrotic tumours. Advanced sequences, such as diffusion-weighted imaging (DWI), perfusion-weighted imaging (PWI) and proton MR spectroscopy (1H-MRS) are very useful in the differential diagnosis from other brain lesions, such as non-pyogenic abscesses or necrotic tumours, and provide essential information on structural, vascular and metabolic characteristics allowing greater neuroradiological confidence. The aim of this pictorial review is to provide a practical approach showing the added value of more advanced MRI techniques in their diagnostic management.
Collapse
|
10
|
Kweh BTS, Lee HQ, Tee JW. Intracranial peripherally enhancing lesions in cardiac transplant recipients: A rare case series and literature review. J Clin Neurosci 2020; 78:284-290. [PMID: 32331940 DOI: 10.1016/j.jocn.2020.04.036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Accepted: 04/05/2020] [Indexed: 12/26/2022]
Abstract
Intracranial peripherally enhancing lesions in immunosuppressed solid organ transplant recipients represent a unique diagnostic and management dilemma due to the vast array of differentials that demand consideration. Diagnosis of the underlying pathology is often guided by the use of magnetic resonance imaging (MRI). We present the first published case series of three cardiac transplant recipients with significantly atypical neuroradiological findings contrary to the tenets of contemporary literature. Our rare case series consists of: (1) A sterile Mycobacterium pyogenic abscess mimicking glioblastoma multiforme due to an immunosuppressed state (2) Epstein Barr Virus encephalitis masquerading as Central Nervous System Post-Transplant Lymphoproliferative Disorder (3) An unusual case of partially treated disseminated Nocardiosis warning of the need to consider the immunosuppressed state and partial treatment response obfuscating classical MRI appearances. We utilise these unprecedented cases as the basis of a literature review to understand the pathophysiology behind the peculiar imaging findings in this rarefied cohort of transplant recipients, and rationalise why the MRI findings in each instance contradicts the accepted imaging patterns. In the setting of potential unreliability of neuroradiology in this immunosuppressed unique subgroup, we hope to impart to clinicians that definitive diagnosis obtained by emergent neurosurgical intervention may be necessary to accurately and expediently guide further medical management.
Collapse
Affiliation(s)
- Barry Ting Sheen Kweh
- National Trauma Research Institute, Melbourne, Victoria 3004, Australia; Department of Neurosurgery, Level 1, Old Baker Building, The Alfred Hospital, 55 Commercial Road, Melbourne, Victoria 3004, Australia
| | - Hui Qing Lee
- National Trauma Research Institute, Melbourne, Victoria 3004, Australia; Department of Neurosurgery, Level 1, Old Baker Building, The Alfred Hospital, 55 Commercial Road, Melbourne, Victoria 3004, Australia
| | - Jin Wee Tee
- National Trauma Research Institute, Melbourne, Victoria 3004, Australia; Department of Neurosurgery, Level 1, Old Baker Building, The Alfred Hospital, 55 Commercial Road, Melbourne, Victoria 3004, Australia.
| |
Collapse
|
11
|
Lasocki A, Hicks RJ. How we read: the combined use of MRI and novel PET tracers for the characterisation and treatment planning of masses in neuro-oncology. Cancer Imaging 2019; 19:57. [PMID: 31426862 PMCID: PMC6700829 DOI: 10.1186/s40644-019-0241-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 07/26/2019] [Indexed: 02/01/2023] Open
Abstract
Technical advances in imaging are well demonstrated by MRI (Magnetic Resonance Imaging) and PET (Positron Emission Tomography). Excellent anatomical detail and a lack of ionising radiation make MRI the standard of care for most neuroimaging indications, and advanced sequences are providing an ever-growing ability for lesion characterisation. PET utilising the tracer fluorine-18 fluorodeoxyglucose is widely used in oncology, while newer PET tracers are able to target a growing number of metabolic pathways and cell membrane receptors. The sequential use of these modalities harnesses the strengths of both, providing complementary diagnostic and therapeutic information.Here we outline the ways in which we use MRI and PET in a complementary manner to improve lesion characterisation in neuro-oncology. Most commonly, an abnormality is detected on either PET or MRI, and the addition of the other modality allows a more confident diagnosis and/or demonstrates additional lesions, guiding treatment decisions and, in some cases, obviating the need for biopsy. These modalities may also be combined to guide the treatment of intracranial masses for which the diagnosis is known, such as neuro-endocrine tumour metastases or meningiomas refractory to conventional therapies.
Collapse
Affiliation(s)
- Arian Lasocki
- Department of Cancer Imaging, Peter MacCallum Cancer Centre, Grattan St, Melbourne, Victoria, 3000, Australia. .,Sir Peter MacCallum Department of Oncology, The University of Melbourne, Parkville, Australia.
| | - Rodney J Hicks
- Department of Cancer Imaging, Peter MacCallum Cancer Centre, Grattan St, Melbourne, Victoria, 3000, Australia.,Sir Peter MacCallum Department of Oncology, The University of Melbourne, Parkville, Australia
| |
Collapse
|
12
|
Quinoa T, Jumah F, Narayan V, Xiong Z, Nanda A, Hanft S. Nocardia amikacinitolerans and cytomegalovirus: distinctive clinical and radiological characterization of the rare etiologies of brain abscesses: report of 2 cases. Neurosurg Focus 2019; 47:E18. [PMID: 31370021 DOI: 10.3171/2019.5.focus19284] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 05/13/2019] [Indexed: 11/06/2022]
Abstract
Central nervous system infections in immunosuppressed patients are rare but potentially lethal complications that require swift diagnoses and intervention. While the differential diagnosis for new lesions on neuroradiological imaging of immunosuppressed patients typically includes infections and neoplasms, image-based heuristics to differentiate the two has been shown to have variable reliability.The authors describe 2 rare CNS infections in immunocompromised patients with atypical physical and radiological presentations. In the first case, a 59-year-old man, who had recently undergone a renal transplantation, was found to have multifocal Nocardia amikacinitolerans abscesses masquerading as neoplasms on diffusion-weighted imaging (DWI); in the second case, a 33-year-old man with suspected recurrent Hodgkin's lymphoma was found to have a nonpyogenic abscess with cytomegalovirus (CMV) encephalitis.As per review of the literature, this appears to be the first case of brain abscess caused by N. amikacinitolerans, a recently isolated superbug. Despite confirmation through brain biopsy later on in case 1, the initial radiological appearance was atypical, showing subtle diffusion restriction on DWI. Similarly, the authors present a case of CMV encephalitis that presented as a ring-enhancing lesion, which is extremely rare. Both cases draw attention to the reliability of neuroimaging in differentiating an abscess from a neoplasm.
Collapse
Affiliation(s)
| | | | | | - Zhenggang Xiong
- 2Pathology and Laboratory Medicine, Rutgers-Robert Wood Johnson Medical School and University Hospital, Rutgers University, New Brunswick, New Jersey
| | | | | |
Collapse
|
13
|
Abstract
PURPOSE OF REVIEW Brain abscesses and spinal epidural abscesses are serious, potentially life-threatening infections of the central nervous system. This article outlines the clinical presentation, evaluation, and management of brain abscesses and spinal epidural abscesses, with a specific focus on bacterial infections. RECENT FINDINGS The overall incidence of brain abscesses has declined, in part because of fewer brain abscesses associated with otogenic infections. However, emerging patient populations at high risk for brain abscess include those with a history of penetrating head trauma, neurosurgery, or immunodeficiency. Improved mortality rates for brain abscess are attributable to modern diagnostic imaging, stereotactic-guided aspiration, and newer antimicrobials that readily penetrate into the central nervous system and abscesses. Brain MRI is more sensitive than CT for brain abscess, particularly in the early stages, but CT remains more widely available and can adequately identify potential abscesses and confirm response to treatment. With the advent of minimally invasive neurosurgical techniques, surgical excision is often employed only for posterior fossa, multiloculated, or superficial well-circumscribed abscesses. In select clinical scenarios, conservative medical management may be a safe alternative to a combined surgical and medical approach. Unlike brain abscess, the incidence of spinal epidural abscess is on the rise and has been attributed to higher prevalence of predisposing factors, including spinal procedures and instrumentation. SUMMARY Successful diagnosis and management of brain abscess and spinal epidural abscess requires a collaborative approach among neurologists, neurosurgeons, radiologists, and infectious disease physicians. The foundation of management of brain abscess includes surgical intervention for diagnostic purposes if a pathogen has not been identified or for decompression of larger abscesses or those with mass effect and significant surrounding edema; appropriate dosing and adequate duration of an antimicrobial regimen tailored to the presumptive source of infection and available culture data, and eradication of the primary source of infection. For spinal epidural abscesses, neurologic status at the time of presentation is directly related to outcomes, underscoring the importance of prompt recognition and intervention.
Collapse
|
14
|
Lai PH, Chung HW, Chang HC, Fu JH, Wang PC, Hsu SH, Hsu SS, Lin HS, Chuang TC. Susceptibility-weighted imaging provides complementary value to diffusion-weighted imaging in the differentiation between pyogenic brain abscesses, necrotic glioblastomas, and necrotic metastatic brain tumors. Eur J Radiol 2019; 117:56-61. [PMID: 31307653 DOI: 10.1016/j.ejrad.2019.05.021] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 05/22/2019] [Accepted: 05/28/2019] [Indexed: 11/17/2022]
Abstract
PURPOSE The purpose of this retrospective study was to investigate the differentiation of abscess and necrotic tumors, using susceptibility-weighted imaging (SWI) and apparent diffusion coefficients (ADC) either separated or combined. METHODS Imaging was performed on 26 patients with pyogenic brain abscesses, 31 patients with rim-enhancing glioblastomas, and 21 patients with rim-enhancing metastases. The degree of intralesional susceptibility signal (ILSS) was independently assessed by three observers. Average ADC in the lesion core was calculated. After receiver operating characteristic (ROC) analysis, the area under the ROC curve was compared using three different analytical models (ILSS, ADC, and ILSS-ADC combined) to differentiate abscess from the two rim-enhancing necrotic tumors. RESULTS The ILSS-ADC combined model had greater area under the ROC curves than ILSS or ADC used alone. In this study, the ILSS-ADC combined model showed 100% diagnostic accuracy differentiating abscesses from glioblastoma. The ADC model and the ILSS-ADC combined model performed equally well in distinguishing abscesses from metastases. CONCLUSION It is concluded that SWI and ADC are complementary, and the combination of SWI and ADC may improve results compared with the use of only one model. Validation by an independent cohort is the next necessary step to broaden its applicability in routine clinical settings.
Collapse
Affiliation(s)
- Ping-Hong Lai
- Department of Radiology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan; School of Medicine, National Yang-Ming University, Taipei, Taiwan
| | - Hsiao-Wen Chung
- Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan
| | - Hing-Chiu Chang
- Department of Diagnostic Radiology, The University of Hong Kong, Hong Kong
| | - Jui-Hsun Fu
- Department of Radiology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Po-Chin Wang
- Department of Radiology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Shuo-Hsiu Hsu
- Department of Radiology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Shu-Shong Hsu
- Department of Neurosurgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Huey-Shyan Lin
- Department of Health-Business Administration, School of Nursing, Fooyin University, Kaohsiung, Taiwan
| | - Tzu-Chao Chuang
- Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan.
| |
Collapse
|
15
|
White ML, Moore DW, Zhang Y, Mark KD, Greiner TC, Bierman PJ. Primary central nervous system post-transplant lymphoproliferative disorders: the spectrum of imaging appearances and differential. Insights Imaging 2019; 10:46. [PMID: 30972513 PMCID: PMC6458224 DOI: 10.1186/s13244-019-0726-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 02/25/2019] [Indexed: 12/17/2022] Open
Abstract
OBJECTIVE Central nervous system post-transplant lymphoproliferative disorder (CNS-PTLD) is a rare disease that presents with non-specific signs and symptoms. The purpose of this article is to present the imaging appearances of CNS-PTLD by magnetic resonance imaging. We highlight the differential diagnostic considerations including primary central nervous system lymphoma, glioblastoma, cerebral abscess, and metastatic disease. This is an important topic to review since in daily practice the diagnosis of CNS-PTLD is often not initially considered when present due to its rarity and the lack of radiologists' familiarity with the disease. CONCLUSION Knowing the unique imaging features of CNS-PTLD narrows the differential diagnosis, facilitates the diagnostic work-up, and optimizes making the diagnosis. Advanced MRI data for CNS PTLD is limited but is promising for helping with narrowing the differential diagnosis.
Collapse
Affiliation(s)
- Matthew L White
- Radiology, University of Nebraska Medical Center, 981045 Nebraska Medical Center, Omaha, NE, 68198-1045, USA.
| | - Drew W Moore
- Radiology, University of Nebraska Medical Center, 981045 Nebraska Medical Center, Omaha, NE, 68198-1045, USA
| | - Yan Zhang
- Radiology, University of Nebraska Medical Center, 981045 Nebraska Medical Center, Omaha, NE, 68198-1045, USA
| | - Keiper D Mark
- Radiology, University of Nebraska Medical Center, 981045 Nebraska Medical Center, Omaha, NE, 68198-1045, USA
| | - Timothy C Greiner
- Pathology, University of Nebraska Medical Center, 983135 Nebraska Medical Center, Omaha, NE, 68198-3135, USA
| | - Philip J Bierman
- Oncology, University of Nebraska Medical Center, 986840 Nebraska Medical Center, Omaha, NE, 68198-6840, USA
| |
Collapse
|
16
|
Uchida D, Amano Y, Nakatogawa H, Masui T, Ando N, Nakayama T, Sato H, Sameshima T, Tanaka T. Setting pressure can change the size and shape of MRI artifacts caused by adjustable shunt valves: a study of the 4 newest models. J Neurosurg 2019; 130:1260-1267. [PMID: 29775146 DOI: 10.3171/2017.12.jns171533] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 12/05/2017] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Adjustable shunt valves that have been developed for the management of hydrocephalus all rely on intrinsically magnetic components, and artifacts with these valves on MRI are thus inevitable. The authors have previously reported that the shapes of shunt artifacts differ under different valve pressures with the proGAV 2.0 valve. In the present study the authors compared the size and shape of artifacts at different pressure settings with 4 new-model shunt valves. METHODS The authors attached 4 new models of MRI-resistant shunt valve to the temporal scalp of a healthy volunteer: the proGAV 2.0; Codman Certas Plus; Polaris; and Strata MR. They set 3 different scales of pressures for each valve, depending on magnet orientation to the body axis. Artifacts were evaluated and compared among all valves on a 3.0-T GE scanner and 2 valves were also evaluated on a Philips scanner and a Siemens scanner. In-plane artifact sizes were evaluated as the maximum distance of the artifact from the expected scalp. RESULTS The sizes and shapes of artifacts changed depending on valve pressure for all valves on the 3 different MRI scanners. Artifacts were less prominent on spin echo sequences than on gradient echo sequences. For diffusion-weighted imaging and time-of-flight MR angiography, the authors matched image numbers within the same sequence and compared appearances of artifacts. For all valves, the number of images affected by artifacts and the image number showing the largest artifact differed among valve settings. CONCLUSIONS Artifacts of all adjustable shunt valves showed gross changes corresponding to pressure setting. Not only the maximum distance of artifacts but also the shape changed significantly. The authors suggest that changing pressure settings offers one of the easiest ways to minimize artifacts on MRI.
Collapse
Affiliation(s)
| | | | | | - Takayuki Masui
- 2Radiology, Seirei Hamamatsu General Hospital, Hamamatsu
| | - Naoto Ando
- 3Department of Neurosurgery, Seirei Numazu General Hospital, Numazu
| | | | - Haruhiko Sato
- 5Department of Neurosurgery, Seirei Mikatahara General Hospital; and
| | - Tetsuro Sameshima
- 6Department of Neurosurgery, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | | |
Collapse
|
17
|
Rapalino O, Mullins ME. Intracranial Infectious and Inflammatory Diseases Presenting as Neurosurgical Pathologies. Neurosurgery 2018; 81:10-28. [PMID: 28575459 DOI: 10.1093/neuros/nyx201] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 05/22/2017] [Indexed: 12/28/2022] Open
Abstract
There are many infectious and inflammatory processes affecting the central nervous system that can simulate other neurosurgical pathologies (e.g. tumor) and may precipitate a brain biopsy for definitive diagnosis if not suspected a priori. The challenge for the healthcare team is to recognize imaging features that support a nonsurgical pathology to avoid unnecessary interventions. This review aims to give a general overview of some common inflammatory and infectious entities that affect the central nervous system, with illustrative examples and highlighting important pearls and pitfalls.
Collapse
Affiliation(s)
- Otto Rapalino
- Department of Radiology, Massachusetts General Hospital, Boston, Massachusetts
| | - Mark E Mullins
- Department of Radiology and Imaging Sciences, Emory University School of Medicine, Atlanta, Georgia
| |
Collapse
|
18
|
Lasocki A, Hicks RJ. Complementary role of MRI and positron emission tomography in diagnosing cerebral abscess in a patient with metastatic paraganglioma. J Med Imaging Radiat Oncol 2018; 62:525-527. [PMID: 29479818 DOI: 10.1111/1754-9485.12717] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 01/25/2018] [Indexed: 11/30/2022]
Abstract
Technological advances have increased the ability of imaging to provide an accurate preoperative diagnosis of an intracranial mass. We present the case of a patient with metastatic paraganglioma, who presented with headache and depressed conscious state. We had chronic tachycardia and low-grade fevers due to increased catecholamine secretion, which limited his clinical assessment. The combination of novel positron emission tomography tracers and advanced magnetic resonance imaging techniques was able to provide a confident preoperative diagnosis of a pyogenic intracranial abscess, which was not suspected clinically. This allowed appropriate therapy to be instituted until the patient's clinical state improved sufficiently for neurosurgery to be performed.
Collapse
Affiliation(s)
- Arian Lasocki
- Department of Cancer Imaging, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| | - Rodney J Hicks
- Department of Cancer Imaging, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| |
Collapse
|
19
|
Economides MP, Ballester LY, Kumar VA, Jiang Y, Tarrand J, Prieto V, Torres HA, Kontoyiannis DP. Invasive mold infections of the central nervous system in patients with hematologic cancer or stem cell transplantation (2000–2016): Uncommon, with improved survival but still deadly often. J Infect 2017; 75:572-580. [DOI: 10.1016/j.jinf.2017.09.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 09/04/2017] [Accepted: 09/11/2017] [Indexed: 11/25/2022]
|
20
|
Soman S, Bregni JA, Bilgic B, Nemec U, Fan A, Liu Z, Barry RL, Du J, Main K, Yesavage J, Adamson MM, Moseley M, Wang Y. Susceptibility-Based Neuroimaging: Standard Methods, Clinical Applications, and Future Directions. CURRENT RADIOLOGY REPORTS 2017; 5. [PMID: 28695062 DOI: 10.1007/s40134-017-0204-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The evaluation of neuropathologies using MRI methods that leverage tissue susceptibility have become standard practice, especially to detect blood products or mineralization. Additionally, emerging MRI techniques have the ability to provide new information based on tissue susceptibility properties in a robust and quantitative manner. This paper discusses these advanced susceptibility imaging techniques and their clinical applications.
Collapse
Affiliation(s)
- Salil Soman
- Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Rosenberg 90A, 1 Deaconess Road, Boston, MA 02215, Tel: 617-754-2009
| | | | - Berkin Bilgic
- Department of Radiology, Massachusetts General Hospital, Harvard Medical School, A.A. Martinos Center for Biomedical Imaging 149 13th Street, Room 2.102, Charlestown, MA 02129, Tel: 617-866-8740
| | - Ursula Nemec
- Department of Radiology, Medical University of Vienna, Austria
| | - Audrey Fan
- Department of Radiology, Stanford School of Medicine 300 Pasteur Dr, MC 5105, Stanford, CA94305
| | - Zhe Liu
- Cornell MRI Research Lab, Cornell University, 515 East 71st St, Suite 104, New York, NY 10021, ,
| | - Robert L Barry
- Department of Radiology, Massachusetts General Hospital, Harvard Medical School, A.A. Martinos Center for Biomedical Imaging 149 13th Street, Suite 2.301, Charlestown, MA 02129 USA, Tel: 615-801-0795
| | - Jiang Du
- Department of Radiology, UCSD, 200 West Arbor Drive, San Diego, CA 92103-8226, Tel: 619-471-0519
| | - Keith Main
- Principal Scientist (SME), Research Division, Defense and Veterans Brain Injury Center, General Dynamics Health Solutions, 1335 East-West Hwy, Suite 4-100, Silver Spring, MD 20910
| | - Jerome Yesavage
- Department of Psychiatry & Behavioral Sciences, Stanford School of Medicine, Mail Code 151-Y, 3801 Miranda Avenue, Palo Alto, California 94304, Phone (650) 852-3287
| | - Maheen M Adamson
- Department of Neurosurgery, Department of Psychiatry & Behavioral Sciences, Stanford School of Medicine, Defense and Veterans Brain Injury Center, VA Palo Alto Health Care System (PSC/117), 3801 Miranda Avenue (151Y), Palo Alto, CA 94304
| | - Michael Moseley
- Department of Radiology, Stanford School of Medicine, Mail Code 5488, Route 8, Rm PS059, Stanford, CA, 94305-5488, Tel: 650-725-6077
| | - Yi Wang
- Department of Radiology, Cornell Medical School, Department of Biomedical Engineering, Cornell University, 301 Weill Hall, 237 Tower Road, Ithaca, NY 14853, Tel: 646 962-2631
| |
Collapse
|
21
|
Guzmán-De-Villoria J, Fernández-García P, Borrego-Ruiz P. Neurologic emergencies in HIV-negative immunosuppressed patients. RADIOLOGIA 2017. [DOI: 10.1016/j.rxeng.2016.09.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
22
|
Guzmán-De-Villoria JA, Fernández-García P, Borrego-Ruiz PJ. Neurologic emergencies in HIV-negative immunosuppressed patients. RADIOLOGIA 2016; 59:2-16. [PMID: 28012729 DOI: 10.1016/j.rx.2016.09.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2016] [Revised: 09/18/2016] [Accepted: 09/23/2016] [Indexed: 12/28/2022]
Abstract
HIV-negative immunosuppressed patients comprise a heterogeneous group including transplant patients, patients undergoing treatment with immunosuppressors, uremic patients, alcoholics, undernourished patients, diabetics, patients on dialysis, elderly patients, and those diagnosed with severe or neoplastic processes. Epileptic seizures, focal neurologic signs, and meningoencephalitis are neurologic syndromes that require urgent action. In most of these situations, neuroimaging tests are necessary, but the findings can be different from those observed in immunocompetent patients in function of the inflammatory response. Infectious disease is the first diagnostic suspicion, and the identification of an opportunistic pathogen should be oriented in function of the type and degree of immunosuppression. Other neurologic emergencies include ischemic stroke, cerebral hemorrhage, neoplastic processes, and pharmacological neurotoxicity. This article reviews the role of neuroimaging in HIV-negative immunodepressed patients with a neurologic complication that requires urgent management.
Collapse
Affiliation(s)
- J A Guzmán-De-Villoria
- Servicio de Radiodiagnóstico, Hospital General Universitario Gregorio Marañón, Madrid, España; CIBER de Salud Mental (CIBERSAM), Madrid, España.
| | - P Fernández-García
- Servicio de Radiodiagnóstico, Hospital General Universitario Gregorio Marañón, Madrid, España
| | - P J Borrego-Ruiz
- Servicio de Radiodiagnóstico, Hospital General Universitario Gregorio Marañón, Madrid, España
| |
Collapse
|
23
|
Gavito-Higuera J, Mullins CB, Ramos-Duran L, Olivas Chacon CI, Hakim N, Palacios E. Fungal Infections of the Central Nervous System: A Pictorial Review. J Clin Imaging Sci 2016; 6:24. [PMID: 27403402 PMCID: PMC4926551 DOI: 10.4103/2156-7514.184244] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2016] [Accepted: 05/17/2016] [Indexed: 12/27/2022] Open
Abstract
Fungal infections of the central nervous system (CNS) pose a threat to especially immunocompromised patients and their development is primarily determined by the immune status of the host. With an increasing number of organ transplants, chemotherapy, and human immunodeficiency virus infections, the number of immunocompromised patients as susceptible hosts is growing and fungal infections of the CNS are more frequently encountered. They may result in meningitis, cerebritis, abscess formation, cryptococcoma, and meningeal vasculitis with rapid disease progression and often overlapping symptoms. Although radiological characteristics are often nonspecific, unique imaging patterns can be identified through computer tomography as a first imaging modality and further refined by magnetic resonance imaging. A rapid diagnosis and the institution of the appropriate therapy are crucial in helping prevent an often fatal outcome.
Collapse
Affiliation(s)
- Jose Gavito-Higuera
- Department of Radiology, Texas Tech University Health Science Center, El Paso, TX 79905, USA
| | - Carola Birgit Mullins
- Department of Radiology, Texas Tech University Health Science Center, El Paso, TX 79905, USA
| | - Luis Ramos-Duran
- Department of Radiology, Texas Tech University Health Science Center, El Paso, TX 79905, USA
| | | | - Nawar Hakim
- Department of Pathology, Texas Tech University Health Science Center, El Paso, TX 79905, USA
| | - Enrique Palacios
- Department of Radiology, Tulane University Health Science Center, New Orleans, LA 70112, USA
| |
Collapse
|
24
|
Susceptibility-weighted imaging and diffusion-weighted imaging findings in central nervous system monomorphic B cell post-transplant lymphoproliferative disorder before and after treatment and comparison with primary B cell central nervous system lymphoma. J Neurooncol 2015; 125:297-305. [PMID: 26341369 DOI: 10.1007/s11060-015-1903-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 08/29/2015] [Indexed: 12/19/2022]
Abstract
The purpose of this article is to review the MRI features of monomorphic central nervous system post-transplant lymphoproliferative disorder (CNS PTLD), including diffusion-weighted and susceptibility-weighted sequences before and after treatment and to compare the imaging findings with those of primary central nervous system B cell lymphoma (PCNS BCL). Retrospective review of the brain MRI characteristics in patients with pathology proven monomorphic CNS PTLD and PCNS BCL was performed. In particular, the enhancement, diffusion-weighted, susceptibility-weighted MRI characteristics of the lesions were evaluated. In addition, the diffusion-weighted, susceptibility-weighted MRI features after treatment for CNS PTLD were evaluated. A total of 12 lesions in six patients with CNS PTLD and 12 lesions in nine patients with PCNS BCL were identified on MRI. Among the CNS PTLD lesions with post-contrast images, 80 % demonstrated peripheral enhancement. All of the CNS PTLD lesions contained foci of intratumoral susceptibility signal (ITSS) and the average mean ADC values and ratios were 0.892 × 10(-3) mm(2)/s (standard deviation: 0.082 × 10(-3) mm(2)/s) and 1.19 (standard deviation: 0.15), respectively. On the other hand, 75 % of the PCNS BCL displayed diffuse enhancement, two cases (16.7 %) contained ITSS, and the mean ADC values and ratios were 0.721 × 10(-3) mm(2)/s (standard deviation: 0.093 × 10(-3) mm(2)/s), and 0.99 (standard deviation: 0.17), respectively. Thus, the presence of heterogeneous lesions with ITSS that do not necessarily have as extensive restricted diffusion as PCNS BCL is suggestive of CNS PTLD in the appropriate clinical setting. The preliminary data in this series suggests that diffusion-weighted imaging may serve as a useful biomarker for monitoring treatment response, in which successful treatment of CNS PTLD may result in increased ADC values. In addition, foci of susceptibility effect in CNS PTLD tend to persist or increase over the course of treatment.
Collapse
|
25
|
Atypical pyogenic brain abscess evaluation by diffusion-weighted imaging: diagnosis with multimodality MR imaging. Jpn J Radiol 2015; 33:668-71. [DOI: 10.1007/s11604-015-0472-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 08/07/2015] [Indexed: 10/23/2022]
|