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Herzig R, Beckmann K, Körner M, Steffen F, Rohrer Bley C. A shortened whole brain radiation therapy protocol for meningoencephalitis of unknown origin in dogs. Front Vet Sci 2023; 10:1132736. [PMID: 37020978 PMCID: PMC10069678 DOI: 10.3389/fvets.2023.1132736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 02/28/2023] [Indexed: 04/07/2023] Open
Abstract
Introduction A variety of treatment options have been described for canine meningoencephalitis of unknown origin (MUO). Few studies focused on radiation therapy as a second line immunomodulating treatment, implicating its effective use. However, a standard radiation therapy protocol is lacking, and further research will help to evaluate the effect of different dose regimens. Methods Ten dogs diagnosed with MUO based on MRI and CSF findings were prospectively enrolled. The dogs were treated with a shortened whole brain radiation therapy protocol (5 × 4 Gy) in combination with prednisolone. Neurologic changes were quantified using an established scoring scheme. Follow-up MRI and CSF examination was scheduled three months after radiation therapy. Overall survival and time to progression were calculated. Histopathology of the brain was performed in case of death. Results Seven dogs were diagnosed de novo and three had a history of relapsing MUO. Neurological status improved in all 10 dogs during radiation therapy, with 4/10 returning to normal shortly after radiation therapy. Three dogs died within the first three months after radiation therapy. At follow-up MRI lesions completely resolved in two dogs, partially resolved in five dogs, and progressed in one dog. After follow-up MRI, dogs were further treated with prednisolone monotherapy (two dogs) and additional immunosuppressant drugs (five dogs). Overall, four dogs showed disease progression, with a mean time to progression of 691 days (95%CI: 396-987) and mean overall survival for all dogs was 723 days (95%CI: 436-1011) (both medians not reached). Histopathology confirmed MUO in three dogs but was suggestive for oligodendroglioma in one dog. Radiation induced side effects were not seen. Conclusion Shortened whole-brain radiation therapy could be an additional treatment option for MUO in conjunction to prednisolone, specifically for cases that require rapid relief of symptoms and with relapsing history.
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Affiliation(s)
- Robert Herzig
- Division of Neurology, Department for Small Animals, Vetsuisse Faculty, University of Zurich, Zürich, Switzerland
- *Correspondence: Robert Herzig
| | - Katrin Beckmann
- Division of Neurology, Department for Small Animals, Vetsuisse Faculty, University of Zurich, Zürich, Switzerland
| | - Maximilian Körner
- Division of Radiation Oncology, Department for Small Animals, Vetsuisse Faculty, University of Zurich, Zürich, Switzerland
| | - Frank Steffen
- Division of Neurology, Department for Small Animals, Vetsuisse Faculty, University of Zurich, Zürich, Switzerland
| | - Carla Rohrer Bley
- Division of Radiation Oncology, Department for Small Animals, Vetsuisse Faculty, University of Zurich, Zürich, Switzerland
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Kent M, Glass EN, Miller AD, de Lahunta A. Neuroendodermal cyst in the fourth ventricle of a dog. Aust Vet J 2017; 95:294-298. [PMID: 28749028 DOI: 10.1111/avj.12613] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Revised: 10/24/2016] [Accepted: 11/29/2016] [Indexed: 01/28/2023]
Abstract
CASE REPORT We describe the MRI appearance and surgical outcome of a rare neuroendodermal cyst in the fourth ventricle of a German Shorthaired Pointer. The dog presented with uncoordinated gait and occasional falling that increased when she became excited. The MRI appearance is shown and the surgical treatment described. Recurrence occurred on two occasions and the dog was euthanased. CONCLUSION Recurrence of these cysts is highly likely unless there is complete surgical resection.
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Affiliation(s)
- M Kent
- Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, 2200 College Station Road, Athens, GA 30605, USA
| | - E N Glass
- Section of Neurology and Neurosurgery, Red Bank Veterinary Hospital, Tinton Falls, NJ, USA
| | - A D Miller
- Section of Anatomic Pathology, Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, USA
| | - A de Lahunta
- Section of Anatomic Pathology, Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, USA
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Claßen AC, Kneissl S, Lang J, Tichy A, Pakozdy A. Magnetic resonance features of the feline hippocampus in epileptic and non-epileptic cats: a blinded, retrospective, multi-observer study. BMC Vet Res 2016; 12:165. [PMID: 27515840 PMCID: PMC4982318 DOI: 10.1186/s12917-016-0788-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Accepted: 08/03/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Hippocampal necrosis in cats has been reported to be associated with epileptic seizures. Magnetic resonance imaging (MRI) features of temporal lobe (TL) abnormalities in epileptic cats have been described but MR images from epileptic and non-epileptic individuals have not yet been systematically compared. TL abnormalities are highly variable in shape, size and signal, and therefore may lead to varying evaluations by different specialists. The aim of this study was to investigate whether there were differences in the appearance of the TL between epileptic and non-epileptic cats, and whether there were any relationships between TL abnormalities and seizure semiologies or other clinical findings. We also investigated interobserver agreement among three specialists. METHODS The MR images of 46 cats were reviewed independently by three observers, who were blinded to patient data, examination findings and the review of the other observers. Images were evaluated using a multiparametric scoring system developed for this study. Mann-Whitney U-tests and chi-square were used to analyse the differences between observers' evaluations. The kappa coefficient (k) and Fleiss' kappa coefficient were used to quantify interobserver agreement. RESULTS The overall interobserver agreement was moderate to good (k =0.405 to 0.615). The MR scores between epileptic and non-epileptic cats did not differ significantly. However, there was a significant difference between the MR scores of epileptic cats with and without orofacial involvement according to all three observers. Likewise, MR scores of cats with cluster seizures were higher than those of cats without clusters. CONCLUSION Cats presenting with recurrent epileptic seizures with orofacial involvement are more likely to have hippocampal pathologies, which suggests that TL abnormalities are not merely unspecific epileptic findings, but are associated with a certain type of epilepsy. TL signal alterations are more likely to be detected on FLAIR sequences. In contrast to severe changes in the TL which were described similarly among specialists, mild TL abnormalities may be difficult to interpret, thus leading to different assessments among observers.
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Affiliation(s)
| | - Sibylle Kneissl
- Clinical Unit of Diagnostic Imaging, University of Veterinary Medicine, A 1210, Vienna, Austria
| | - Johann Lang
- Division of Clinical Radiology, Vetsuisse Faculty, University of Bern, CH 3012, Bern, Switzerland
| | - Alexander Tichy
- Department of Biomedical Sciences, University of Veterinary Medicine, A 1210, Vienna, Austria
| | - Akos Pakozdy
- Clinic for Internal Medicine, University of Veterinary Medicine, A 1210, Vienna, Austria
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4
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Han JI, Chang DW, Na KJ. A multiplex quantitative real-time polymerase chain reaction panel for detecting neurologic pathogens in dogs with meningoencephalitis. J Vet Sci 2015; 16:341-7. [PMID: 26040611 PMCID: PMC4588020 DOI: 10.4142/jvs.2015.16.3.341] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Accepted: 04/04/2015] [Indexed: 11/20/2022] Open
Abstract
Meningoencephalitis (ME) is a common inflammatory disorder of the central nervous system in dogs. Clinically, ME has both infectious and non-infectious causes. In the present study, a multiplex quantitative real-time polymerase chain reaction (mqPCR) panel was optimized for the detection of eight canine neurologic pathogens (Blastomyces dermatitidis, Cryptococcus spp., Neospora caninum, Borrelia burgdorferi, Bartonella spp., Toxoplasma gondii, Ehrlichia canis, and canine distemper virus [CDV]). The mqPCR panel was subsequently applied to 53 cerebrospinal fluid (CSF) samples collected from dogs with ME. The analytic sensitivity (i.e., limit of detection, expressed as molecules per 1 µL of recombinant vector) was 3.8 for CDV, 3.7 for Ehrlichia canis, 3.7 for Bartonella spp., 3.8 for Borrelia burgdorferi, 3.7 for Blastomyces dermatitidis, 3.7 for Cryptococcus spp., 38 for Neospora caninum, and 3.7 for Toxoplasma gondii. Among the tested CSF samples, seven (15%) were positive for the following pathogens in decreasing order of frequency: Cryptococcus spp. (3/7), Blastomyces dermatitidis (2/7), and Borrelia burgdorferi (2/7). In summary, use of an mqPCR panel with high analytic sensitivity as an initial screen for infectious agents in dogs with ME could facilitate the selection of early treatment strategies and improve outcomes.
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Affiliation(s)
- Jae-Ik Han
- Laboratory of Veterinary Laboratory Medicine, College of Veterinary Medicine, Chungbuk National University, Cheongju 361-763, Korea
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5
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Beckmann K, Carrera I, Steffen F, Golini L, Kircher PR, Schneider U, Bley C. A newly designed radiation therapy protocol in combination with prednisolone as treatment for meningoencephalitis of unknown origin in dogs: a prospective pilot study introducing magnetic resonance spectroscopy as monitor tool. Acta Vet Scand 2015; 57:4. [PMID: 25637270 PMCID: PMC4316757 DOI: 10.1186/s13028-015-0093-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Accepted: 01/09/2015] [Indexed: 11/29/2022] Open
Abstract
Background A plethora of treatment options have been described for canine meningoencephalitis of unknown origin (MUO), yet a gold standard has not been established. The aim of this prospective pilot study was to document the effect of a newly designed 30 Gray (Gy) radiation therapy (RT) protocol plus corticosteroids as treatment for focal and multifocal MUO, to monitor clinical and imaging changes during the course of the disease with conventional magnetic resonance imaging (MRI) and proton MR Spectroscopy (H-1 MRS) and to detect the occurrence of radiation related side effects. Results Six dogs (3 with focal and 3 with multifocal lesions) were included in the study. The RT protocol used consisted of 30 Gy in 10 fractions. The neurological status of all six dogs improved during RT, with 3 of 6 cases returning to a normal condition. One dog was euthanized early during follow-up (<3 weeks after end of RT). Three month follow up MRI was normal in one dog and improved in 3 dogs and H-1 MRS normalized in 4. In the dog without improvement of the MRI lesions, the N-acetyl aspartate continued to decrease, while choline and creatine concentrations remained stable during that time. This dog was euthanized 18 month after the end of RT due to relapse. One dog was lost to follow up 12 month after completion of RT. The other 3 dogs are still alive at the time of writing. Conclusions RT with 30 Gy in 10 fractions can provide an additional option for anti-inflammatory treatment of focal and multifocal MUO. The protocol used for treatment monitoring was feasible while no side effects of RT could be observed during the follow up period. Moreover, H-1 MRS could represent a new and non-invasive tool to control the progression of the disease during the treatment course.
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Young BD, Mankin JM, Griffin JF, Fosgate GT, Fowler JL, Levine JM. Comparison of two fat-suppressed magnetic resonance imaging pulse sequences to standard t2-weighted images for brain parenchymal contrast and lesion detection in dogs with inflammatory intracranial disease. Vet Radiol Ultrasound 2014; 56:204-11. [PMID: 25395066 DOI: 10.1111/vru.12220] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2014] [Accepted: 08/20/2014] [Indexed: 11/28/2022] Open
Abstract
T2-weighted (T2w) sequences are commonly relied upon in magnetic resonance imaging protocols for the detection of brain lesions in dogs. Previously, the effect of fluid suppression via fluid-attenuated inversion recovery (FLAIR) has been compared to T2-weighting with mixed results. Short tau inversion recovery (STIR) has been reported to increase the detection of some CNS lesions in people. The purpose of the current study was to evaluate the effect of fat suppression on brain parenchymal contrast resolution and lesion detection in dogs. We compared three sequences: T2w images, STIR, and T2w FLAIR with chemical fat suppression (T2-FLAIR-FS) in dogs with meningoencephalitis. Dogs with meningoencephalitis and dogs with idiopathic epilepsy were retrospectively identified and anonymized. Evaluators recorded the presence or absence of lesions within 12 predetermined brain regions on randomized sequences, viewing and scoring each sequence individually. Additionally, signal-to-noise ratios, contrast-to-noise ratios, and relative contrast (RC) were measured in a reference population. Short tau inversion recovery sequences had the highest RC between gray and white matter. While descriptively more lesions were identified by evaluators on T2-FLAIR-FS images, there was no statistical difference in the relative sensitivity of lesion detection between the sequences. Nor was there a statistical difference in false lesion detection within our reference population. Short tau inversion recovery may be favored for enhanced anatomic contrast depiction in brain imaging. No benefit of the inclusion of a fat-suppressed T2-FLAIR sequence was found.
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Affiliation(s)
- Benjamin D Young
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843
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7
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Coates JR, Jeffery ND. Perspectives on Meningoencephalomyelitis of Unknown Origin. Vet Clin North Am Small Anim Pract 2014; 44:1157-85. [DOI: 10.1016/j.cvsm.2014.07.009] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Hicks JA, Kennedy MJ, Patterson EE. Perianesthetic complications in dogs undergoing magnetic resonance imaging of the brain for suspected intracranial disease. J Am Vet Med Assoc 2014; 243:1310-5. [PMID: 24134582 DOI: 10.2460/javma.243.9.1310] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To evaluate the occurrence of perianesthetic complications in dogs undergoing MRI for suspected intracranial disease and identify risk factors associated with observed complications. DESIGN Retrospective case-control study. ANIMALS 238 client-owned dogs undergoing MRI of the brain. PROCEDURES Signalment, clinical signs, neurologic examination findings, presumptive diagnosis, anesthesia-related variables, whether CSF was collected and CSF analysis results, severe perianesthetic complications (need for a ventilator following anesthesia or perianesthetic death), and anesthetic recovery time were recorded. Selected factors were compared between dogs with and without intracranial lesions and dogs with and without perianesthetic complications (including severe complications and prolonged anesthetic recovery [> 20 minutes from the end of anesthesia to extubation]). RESULTS 3 of 149 (2%) dogs with and 0 of 89 dogs without intracranial lesions required ventilation following anesthesia; the difference was nonsignificant. Recovery time was significantly longer in dogs with (median, 15 minutes) than in dogs without (10 minutes) intracranial lesions. Abnormal mentation prior to anesthesia was the only clinical sign that differed significantly between dogs with (15/26 [58%]) and without (70/212 [33%]) perianesthetic complications. A significantly larger proportion of dogs with perianesthetic complications had intracranial masses (13/26 [50%]), compared with dogs without these complications (56/212 [26%]). CONCLUSIONS AND CLINICAL RELEVANCE Dogs with complications were more likely to have had intracranial lesions than were dogs without complications, but few dogs had severe complications. Abnormal mentation was more common in dogs with than in dogs without complications. Prospective studies to further evaluate perianesthetic risk factors and procedures for improving outcomes in these patients are warranted.
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Affiliation(s)
- Jill A Hicks
- Department of Clinical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN 50118
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Gielen I, Kromhout K, Gavin P, Van Ham L, Polis I, van Bree H. Agreement between low-field MRI and CT for the detection of suspected intracranial lesions in dogs and cats. J Am Vet Med Assoc 2014; 243:367-75. [PMID: 23865879 DOI: 10.2460/javma.243.3.367] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To assess the agreement between CT and MRI for enabling detection of intracranial lesions in cats and dogs. DESIGN Evaluation study. ANIMALS 51 dogs and 7 cats with suspected intracranial lesions. PROCEDURES During a 2-year-period, dogs and cats with suspected intracranial pathological changes underwent MRI and CT (single slice) of the head. Radiologists evaluated images produced with both techniques without awareness of subject identity. Agreement between methods was assessed for allowing detection of solitary or multiple lesions, selected lesion characteristics (via the Cohen κ statistic), and lesion dimensions (via Bland-Altman plots). RESULTS CT and MRI had substantial agreement for allowing detection of lesions and identification of whether the lesions were solitary or multiple. The techniques agreed almost perfectly for allowing identification of a mass effect and contrast medium enhancement, which were considered principal diagnostic imaging signs. A lower degree of agreement was attained for allowing identification of enhancement patterns and aspects of lesion margins. Agreement was substantial to almost perfect for lesion visualization in most anatomic brain regions but poor for identification of lesion dimensions. CONCLUSIONS AND CLINICAL RELEVANCE Degrees of agreement between CT and MRI for allowing the detection and characterization of intracranial lesions ranged from poor to almost perfect, depending on the variable assessed. More investigation is needed into the relative analytic sensitivity and possible complementarities of CT and MRI in the detection of suspected intracranial lesions in dogs and cats.
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Affiliation(s)
- Ingrid Gielen
- Department of Veterinary Medical Imaging and Small Animal Orthopaedics, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
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Ives EJ, Rousset N, Heliczer N, Herrtage ME, Vanhaesebrouck AE. Exclusion of a brain lesion: is intravenous contrast administration required after normal precontrast magnetic resonance imaging? J Vet Intern Med 2014; 28:522-8. [PMID: 24467361 PMCID: PMC4857966 DOI: 10.1111/jvim.12300] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Revised: 11/13/2013] [Accepted: 12/11/2013] [Indexed: 12/01/2022] Open
Abstract
Background No evidence‐based guidelines are available for the administration of gadolinium‐based contrast media to veterinary patients. Objective To investigate whether administration of intravenous (IV) contrast media alters the likelihood of identifying a brain lesion in dogs and cats. Animals Four hundred and eighty‐seven client‐owned animals referred for investigation of intracranial disease. Methods Two reviewers retrospectively analyzed precontrast transverse and sagittal T1‐weighted (T1W), T2‐weighted, and fluid‐attenuated inversion recovery low‐field MRI sequences from each patient for the presence of a clinically relevant brain lesion. All sequences subsequently were reviewed in the same manner with additional access to postcontrast T1W images. Results Of the 487 precontrast MRI studies, 312 were judged to be normal by 1 or both reviewers. Of these 312 studies, a previously undetected lesion was identified in only 6 cases (1.9%) based on changes observed on postcontrast sequences. Final diagnoses included meningoencephalitis of unknown origin (n = 1), feline infectious peritonitis (n = 1), and neoplasia (n = 2). All 4 of these cases had persistent neurological deficits suggestive of an underlying brain lesion. Contrast enhancement observed in the 2 other cases was considered falsely positive based on the results of further investigations. Conclusions and Clinical Importance In patients with normal neurological examination and normal precontrast MRI, the subsequent administration of IV gadolinium‐based contrast media is highly unlikely to disclose a previously unidentified lesion, calling into question the routine administration of contrast media to these patients. However, administration still should be considered in animals with persistent neurological deficits suggestive of an underlying inflammatory or neoplastic brain lesion.
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Affiliation(s)
- E J Ives
- The Queen's Veterinary School Hospital, Department of Veterinary Medicine, University of Cambridge, Cambridge, UK
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11
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Leclerc MK, d'Anjou MA, Blond L, Carmel ÉN, Dennis R, Kraft SL, Matthews AR, Parent JM. Interobserver agreement and diagnostic accuracy of brain magnetic resonance imaging in dogs. J Am Vet Med Assoc 2014; 242:1688-95. [PMID: 23725432 DOI: 10.2460/javma.242.12.1688] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To evaluate interobserver agreement and diagnostic accuracy of brain MRI in dogs. DESIGN Evaluation study. ANIMALS 44 dogs. PROCEDURES 5 board-certified veterinary radiologists with variable MRI experience interpreted transverse T2-weighted (T2w), T2w fluid-attenuated inversion recovery (FLAIR), and T1-weighted-FLAIR; transverse, sagittal, and dorsal T2w; and T1-weighted-FLAIR postcontrast brain sequences (1.5 T). Several imaging parameters were scored, including the following: lesion (present or absent), lesion characteristics (axial localization, mass effect, edema, hemorrhage, and cavitation), contrast enhancement characteristics, and most likely diagnosis (normal, neoplastic, inflammatory, vascular, metabolic or toxic, or other). Magnetic resonance imaging diagnoses were determined initially without patient information and then repeated, providing history and signalment. For all cases and readers, MRI diagnoses were compared with final diagnoses established with results from histologic examination (when available) or with other pertinent clinical data (CSF analysis, clinical response to treatment, or MRI follow-up). Magnetic resonance scores were compared between examiners with κ statistics. RESULTS Reading agreement was substantial to almost perfect (0.64 < κ < 0.86) when identifying a brain lesion on MRI; fair to moderate (0.14 < κ < 0.60) when interpreting hemorrhage, edema, and pattern of contrast enhancement; fair to substantial (0.22 < κ < 0.74) for dural tail sign and categorization of margins of enhancement; and moderate to substantial (0.40 < κ < 0.78) for axial localization, presence of mass effect, cavitation, intensity, and distribution of enhancement. Interobserver agreement was moderate to substantial for categories of diagnosis (0.56 < κ < 0.69), and agreement with the final diagnosis was substantial regardless of whether patient information was (0.65 < κ < 0.76) or was not (0.65 < κ < 0.68) provided. CONCLUSIONS AND CLINICAL RELEVANCE The present study found that whereas some MRI features such as edema and hemorrhage were interpreted less consistently, radiologists were reasonably constant and accurate when providing diagnoses.
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Affiliation(s)
- Mylène-Kim Leclerc
- Département de Sciences Cliniques, Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, QC J2S 7C6, Canada.
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12
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Dustin Dees D, MacLaren NE, Fritz KJ, Broome MR, Esson DW. Evaluation of intraorbital prosthetic pigmentation using 0.3 and 1.5 Tesla magnetic resonance imaging and computed tomography. Vet Ophthalmol 2013; 17:184-9. [PMID: 23738745 DOI: 10.1111/vop.12064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
PURPOSE To investigate the magnetic susceptibility artifact associated with pigmented intraorbital prosthetics when performing magnetic resonance imaging (MRI) and computed tomography (CT). Potential artifact reduction techniques were also investigated. STUDY DESIGN Prospective study. METHODS Five different-colored 20-millimeter small animal silicone intraorbital prosthetics and two equine prosthetics were evaluated using 0.3 and 1.5 Tesla (T) MRI and CT. MRI sequences included T1- (T1WI) and T2-weighted spin echo (T2WI), T2 gradient echo (T2*), short tau inversion recovery (STIR), and fluid-attenuated inversion recovery (FLAIR). When present, artifact size was measured using computerized software by three separate observers. Artifact reduction techniques included alterations in receiver bandwidth, field of view, slice thickness, and matrix size. RESULTS The ferrous brown-pigmented prosthetic resulted in a magnetic susceptibility artifact with MRI. No artifact was observed on CT images. Interobserver variability was not statistically significant. For both the 0.3T and 1.5T MRI, the T2* sequence exhibited the largest artifact surface area followed by T2WI, T1WI, STIR, and FLAIR. Decreasing slice thickness showed a decrease in artifact size; however, this difference was not statistically significant. CONCLUSIONS The ferrous substances in the brown intraorbital prosthetic resulted in a significant magnetic susceptibility artifact when performing MRI. Artifact reduction techniques did not significantly decrease artifact surface area. The use of ferrous brown-pigmented prosthetics and their potential to affect future MR imaging studies should be adequately discussed with pet owners.
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Affiliation(s)
- D Dustin Dees
- Eye Care for Animals, 1021 E. 3300 S., Salt Lake City, UT, 84106, USA
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13
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Keenihan E, Summers B, David F, Lamb C. CANINE MENINGEAL DISEASE: ASSOCIATIONS BETWEEN MAGNETIC RESONANCE IMAGING SIGNS AND HISTOLOGIC FINDINGS. Vet Radiol Ultrasound 2013; 54:504-15. [DOI: 10.1111/vru.12055] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Accepted: 04/25/2013] [Indexed: 11/29/2022] Open
Affiliation(s)
- E.K. Keenihan
- Department of Clinical Sciences and Services; The Royal Veterinary College, University of London; Hertfordshire; AL9 7TA; United Kingdom
| | - B.A. Summers
- Department of Pathology and Pathogen Biology; The Royal Veterinary College, University of London; Hertfordshire; AL9 7TA; United Kingdom
| | - F.H. David
- Department of Clinical Sciences and Services; The Royal Veterinary College, University of London; Hertfordshire; AL9 7TA; United Kingdom
| | - C.R. Lamb
- Department of Clinical Sciences and Services; The Royal Veterinary College, University of London; Hertfordshire; AL9 7TA; United Kingdom
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Terzo E, McConnell JF, Shiel RE, McAllister H, Behr S, Priestnall SL, Smith KC, Nolan CM, Callanan JJ. Unique topographic distribution of greyhound nonsuppurative meningoencephalitis. Vet Radiol Ultrasound 2012; 53:636-42. [PMID: 22742427 DOI: 10.1111/j.1740-8261.2012.01963.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Accepted: 05/13/2012] [Indexed: 11/26/2022] Open
Abstract
Greyhound nonsuppurative meningoencephalitis is an idiopathic breed-associated fatal meningoencephalitis with lesions usually occurring within the rostral cerebrum. This disorder can only be confirmed by postmortem examination, with a diagnosis based upon the unique topography of inflammatory lesions. Our purpose was to describe the magnetic resonance (MR) imaging features of this disease. Four Greyhounds with confirmed Greyhound nonsuppurative meningoencephalitis were evaluated by MR imaging. Lesions predominantly affected the olfactory lobes and bulbs, frontal, and frontotemporal cortical gray matter, and caudate nuclei bilaterally. Fluid attenuation inversion recovery (FLAIR) and T2 weighted spin-echo (T2W) sequences were most useful to assess the nature, severity, extension, and topographic pattern of lesions. Lesions were predominantly T2-hyperintense and T1-isointense with minimal or absent contrast enhancement.
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Affiliation(s)
- Eloisa Terzo
- School of Veterinary Medicine, University Veterinary Hospital, University College, Dublin, Ireland.
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15
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Flegel T, Oevermann A, Oechtering G, Matiasek K. Diagnostic yield and adverse effects of MRI-guided free-hand brain biopsies through a mini-burr hole in dogs with encephalitis. J Vet Intern Med 2012; 26:969-76. [PMID: 22708694 DOI: 10.1111/j.1939-1676.2012.00961.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Revised: 04/17/2012] [Accepted: 05/10/2012] [Indexed: 10/28/2022] Open
Abstract
BACKGROUND The diagnosis of encephalitis is usually presumptive based on MRI, cerebrospinal fluid analysis, or both. A definitive diagnosis based on histopathology, however, is required for optimizing treatment strategies. OBJECTIVE To investigate the diagnostic yield and adverse effects of minimally invasive brain biopsies in dogs with encephalitis. ANIMALS Seventeen dogs with suspected encephalitis, based on MR imaging and cerebrospinal fluid analysis. METHODS Retrospective study. Minimally invasive, free-hand brain biopsy specimens were taken from forebrain lesions through a 4-mm burr hole using a Sedan side-cutting needle. Routine histopathological examination was performed. The adverse effects were assessed by MRI evaluations after biopsy procedure (12/17) and by sequential neurological examinations. RESULTS The overall diagnostic yield with regard to a specific type of encephalitis was 82%. Encephalitis was evident in an additional 12%, but a specific disease could not be determined. There were no deaths caused by the biopsy procedure itself, but the indirect case fatality rate was 6%. Morbidity was 29%, including stupor, seizures, tetraparesis, hemiparesis, ataxia, and loss of conscious proprioception. All these signs resolved within 3-14 days. CONCLUSIONS AND CLINICAL IMPORTANCE Minimally invasive brain biopsy in dogs with suspected encephalitis leads to a definite diagnosis in the majority of dogs, allowing for a specific treatment. The advantages of a definite diagnosis outweigh potential case fatality rate and temporary neurological deficits.
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Affiliation(s)
- T Flegel
- Department of Small Animal Medicine, University of Leipzig, Leipzig, Germany.
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16
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Abstract
Magnetic resonance imaging (MRI) in equidae suffering meningoencephalitis (ME) has not been described. The objective of this paper is to describe brain MRI findings in a foal with bacterial ME. A five-month-old, 200 kg bwt Arabian filly was referred with a history of abnormal mental status and locomotion. The filly was recumbent and obtunded, and pupillary light reflexes were sluggish, and oculocephalic movements were normally present. Ophthalmic examination revealed bilateral optic neuritis. Hematology revealed leukocytosis and neutrophilia. Cerebrospinal fluid analysis showed neutrophilic pleocytosis with intracellular bacteria. On brain MRI, there were multifocal cortical areas of mild hyperintensity on T2-weighted images (T2WI) affecting both hemispheres. The lesions had ill-delineated margins, and there was loss of differentiation between gray and white matter. Diffuse hyperintensity was also identified in the left cerebellar cortex on T2WI. Neither mass effect nor cerebral midline shift were identified. On FLAIR images, the lesions were also hyperintense and, in some areas, they seemed to coalescence to form diffuse cortical areas of hyperintensity. The MRI findings described were similar to the MRI features described in cases of humans and small animals with ME. Brain MRI can be a useful diagnostic tool in foals and small-sized equidae with intracranial disease.
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17
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d'Anjou MA, Carmel ÉN, Blond L, Beauchamp G, Parent J. EFFECT OF ACQUISITION TIME AND CHEMICAL FAT SUPPRESSION ON MENINGEAL ENHANCEMENT ON MR IMAGING IN DOGS. Vet Radiol Ultrasound 2011; 53:11-20. [DOI: 10.1111/j.1740-8261.2011.01864.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Affiliation(s)
- Marc-André d'Anjou
- Companion Animal Research Group; Faculté de Médecine Vétérinaire; Université de Montréal; Saint-Hyacinthe; Québec; Canada
| | - Éric Norman Carmel
- Companion Animal Research Group; Faculté de Médecine Vétérinaire; Université de Montréal; Saint-Hyacinthe; Québec; Canada
| | - Laurent Blond
- Companion Animal Research Group; Faculté de Médecine Vétérinaire; Université de Montréal; Saint-Hyacinthe; Québec; Canada
| | - Guy Beauchamp
- Département de Sciences Cliniques; Département de Pathologie; Faculté de Médecine Vétérinaire; Université de Montréal; Saint-Hyacinthe; Québec; Canada
| | - Joane Parent
- Companion Animal Research Group; Faculté de Médecine Vétérinaire; Université de Montréal; Saint-Hyacinthe; Québec; Canada
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18
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Konar M, Lang J. Pros and cons of low-field magnetic resonance imaging in veterinary practice. Vet Radiol Ultrasound 2011; 52:S5-S14. [PMID: 21392156 DOI: 10.1111/j.1740-8261.2010.01780.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Low-field (LF) (0.2-0.4T) magnetic resonance (MR) imaging predominates in veterinary practice. Advantages of LF MR include reduced costs, better patient access, and greater safety. High quality examinations can be achieved using appropriate protocols and investing more scanning time than with high-field (HF) systems. The main disadvantage of LF MR is the reduced signal to noise ratio compared with HF systems. LF MR protocols for small animal brain and spine imaging are described.
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Palus V, Volk HA, Lamb CR, Targett MP, Cherubini GB. MRI FEATURES OF CNS LYMPHOMA IN DOGS AND CATS. Vet Radiol Ultrasound 2011; 53:44-9. [DOI: 10.1111/j.1740-8261.2011.01872.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Affiliation(s)
- Viktor Palus
- Dick White Referrals; Veterinary Specialist Centre; Six Mile Bottom; Suffolk; CB8 0UH; UK
| | - Holger A. Volk
- Department of Veterinary Clinical Sciences; The Royal Veterinary College; University of London; North Mymms; Hertfordshire; AL9 7TA; UK
| | - Christopher R. Lamb
- Department of Veterinary Clinical Sciences; The Royal Veterinary College; University of London; North Mymms; Hertfordshire; AL9 7TA; UK
| | - Mike P. Targett
- and School of Veterinary Medicine and Science; University of Nottingham; Sutton Bonington; Leicestershire; LE12 5RD; UK
| | - Giunio Bruto Cherubini
- Dick White Referrals; Veterinary Specialist Centre; Six Mile Bottom; Suffolk; CB8 0UH; UK
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20
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Abstract
This report describes the clinical, histopathologic, and imaging findings of multifocal oligodendrogliomas from three canine patients. Clinical history varied but included seizure activity and behavior changes. Neurologic examination abnormalities included ataxia, proprioceptive deficits, cranial nerve deficits, and changes in mentation. MRI in one patient revealed multifocal brain lesions; however, the MRI was normal in another one of the patients. Histopathologic evaluation identified multifocal neoplastic infiltrates in all three patients involving the cerebral cortex, brainstem, and spinal cord, with leptomeningeal extension in two of the three patients. All three patients were euthanized due to progression of their neurologic condition and/or complications due to aspiration pneumonia. Oligodendrogliomas should be considered a differential diagnosis for patients with multifocal brain disease.
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Affiliation(s)
- Michael W Koch
- Department of Clinical Studies, Internal Medicine Section, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, USA
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21
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Hecht S, Adams WH, Smith JR, Thomas WB. Clinical and Imaging Findings in Five Dogs with Intracranial Blastomycosis (Blastomyces dermatiditis). J Am Anim Hosp Assoc 2011; 47:241-9. [DOI: 10.5326/jaaha-ms-5573] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Fungal infections affecting the central nervous system are rare. The purpose of this study was to describe clinical and imaging findings in dogs with intracranial blastomycosis (Blastomyces dermatiditis). The radiology database was searched retrospectively for patients with a diagnosis of intracranial blastomycosis which had computed tomography performed as part of their diagnostic work-up. Medical records and imaging studies were reviewed. Five dogs met the inclusion criteria. Major presenting complaints were stertor/nasal discharge (n=2), exophthalmos (n=1), and seizures (n=2). Clinical and laboratory findings were variable. Computed tomographic examination revealed a single contrast-enhancing intra-axial mass (n=1), a nasal mass disrupting the cribriform plate (n=3), and an intracranial mass extending into the orbit and nasal cavity (n=1). Findings in intracranial blastomycosis in dogs are variable, and the disease may mimic other inflammatory disorders or neoplasia.
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Affiliation(s)
- Silke Hecht
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, TN (S.H., W.A., W.T.); and Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA (J.S.)
| | - William H. Adams
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, TN (S.H., W.A., W.T.); and Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA (J.S.)
| | - Joanne R. Smith
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, TN (S.H., W.A., W.T.); and Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA (J.S.)
| | - William B. Thomas
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, TN (S.H., W.A., W.T.); and Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA (J.S.)
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22
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Talarico LR, Schatzberg SJ. Idiopathic granulomatous and necrotising inflammatory disorders of the canine central nervous system: a review and future perspectives. J Small Anim Pract 2010; 51:138-49. [DOI: 10.1111/j.1748-5827.2009.00823.x] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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23
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Hecht S, Adams WH. MRI of Brain Disease in Veterinary Patients Part 1: Basic Principles and Congenital Brain Disorders. Vet Clin North Am Small Anim Pract 2010; 40:21-38. [DOI: 10.1016/j.cvsm.2009.09.005] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Hecht S, Adams WH. MRI of Brain Disease in Veterinary Patients Part 2: Acquired Brain Disorders. Vet Clin North Am Small Anim Pract 2010; 40:39-63. [DOI: 10.1016/j.cvsm.2009.09.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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