Magnetic resonance imaging of melanomas in the head region of 3 horses

Gerlach, Kerstin; Cronau, M; McMullen, Roger L.; Gerhards, H

doi:10.21836/pem20070306

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…The use of CT and MRI is usually restricted to masses that need further evaluation for diagnostic or treatment planning purposes. Compared with ultrasound, CT and MRI provide better coverage of the entire lesion on the images (larger field of view), allow using multiple imaging planes (or even 3D models) and allow visualisation of tissues covered by gas or bone (Fig 14b,d) (Ramirez and Tucker 2004;Wollanke et al 2006;Gerlach et al 2007;van den Top et al 2007;Jakesova et al 2008;Pekarkova et al 2009;Naylor et al 2010a;Schneider et al 2010;Santos et al 2012;Bienert-Zeit et al 2014;McConnell et al 2014). The use of contrast media aids in determining the exact lesion demarcation and assessment of potential invasion into the surrounding tissues.…”

Section: Imaging Of Extracranial Soft Tissuesmentioning

confidence: 99%

Application and indications of magnetic resonance imaging and computed tomography of the equine head

Manso‐Díaz

Taeymans²,

García‐López

et al. 2019

Equine Veterinary Education

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The equine head is an anatomically highly complex area affected by a range of disorders, making the diagnosis of head conditions challenging. Imaging techniques play a crucial role in the diagnostic work-up of head disorders. Tomographic imaging methods, such as computed tomography (CT) and magnetic resonance imaging (MRI) are particularly useful in avoiding problems associated with superimposition of multiple structures in this highly complex region. Both techniques are becoming more widely available in equine medicine. However, the choice between CT and MRI for imaging the equine head is not always straightforward. Each modality has advantages and disadvantages in terms of practicality, costs and diagnostic value for particular problems. The aim of this review is to describe the application of CT and MRI for imaging the equine head and to provide a practical guide for their use in different anatomical structures and clinical indications. This should allow the equine practitioner to make an informed decision on which modality to choose. Magnetic resonance imaging Magnetic resonance imaging images are the result of the stimulation of magnetised tissues by radio waves and capturing the returning radio waves from the stimulated tissues. Depending on the type of emitted radio wave (duration,

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Section: Imaging Of Extracranial Soft Tissuesmentioning

confidence: 99%

Application and indications of magnetic resonance imaging and computed tomography of the equine head

Manso‐Díaz

Taeymans²,

García‐López

et al. 2019

Equine Veterinary Education

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“…Anschließend wurde das bereits aufgewärmte Kontrastmittel Omnipaque (Omnipaque ® 350; 10-15 ml/100 kg, ingesamt 20 ml) 7 de nachgewiesen, dass Gene, die für den Phänotyp und damit den Farbwechsel des Fells bei Schimmeln verantwortlich sind, in Melanomen überexprimiert werden [5,6] . Dies erklärt, weshalb in einer Studie mit Lipizzanern, die alle Altersgruppen einschließen, bei 50 % der Tiere Melanome diagnostiziert wurden [17] .…”

Section: Myelographieunclassified

“…Typische Lokalisationen für Melanome beim Pferd sind der Perianalbereich, die Unterseite der Schweifrübe und der Genitalbereich. Andere typische Lokalisationen sind Lippe, Parotis und Kopf [7,8] ; Thorax-und Bauchorgane können ebenfalls vorkommen, wobei es sich bei den letzteren meistens um Metastasen eines primären Hauttumors handelt [9] .…”

Section: Introductionunclassified

Spinal ataxia due to cervical cord compression caused by a melanoma in the extradural atlanto-occipital neck region in an ataxic pony

Brunner,

Fürst,

Suárez Sánchez-Andrade

et al. 2024

PHK

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Zusammenfassung: In diesem Fallbericht wird eine seltene Manifestation eines Melanoms im Halsmark präsentiert. Ein 16-jähriger Minishetlandpony-Wallach, Schimmel, ohne äußerlich sichtbare melanomverdächtige Hautveränderungen, wurde wegen akuter und progressiv verlaufender Ataxie an der Pferdeklinik der Universität Zürich vorgestellt. Nach der klinischen und neurologischen Untersuchung konnten die Symptome auf eine Halsmarkläsion lokalisiert werden. Mithilfe von Myelographie und Computertomographie mit Kontrastmittel ließ sich eine Masse im Subarachnoidraum feststellen, welche das Halsmark komprimierte. Aufgrund der schlechten Prognose wurde das Pony euthanasiert. Makroskopisch sowie histologisch konnte ein Melanom im Wirbelkanal im atlanto-okzipitalen Übergang diagnostiziert werden. Dieser Fall zeigt, dass auch bei der Abwesenheit von äußerlichen Melanomen, innere Melanome nicht ausgeschlossen werden können und der Primärtumor auch an einer atypischen Lokalisation, wie dem Rückenmarkskanal, auftreten kann.

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Comparison of image quality and in vivo appearance of the normal equine nasal cavities and paranasal sinuses in computed tomography and high field (3.0 T) magnetic resonance imaging

et al. 2016

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BackgroundComputed tomography (CT) is a well-established imaging technique in the diagnostics of equine sinunasal disease. High-field magnetic resonance imaging (MRI) is becoming more readily available in equine veterinary medicine. MRI is appreciated for its superior ability to depict soft tissues with high contrast. To compare the established technique of CT in the depiction of the equine nasal cavities, paranasal sinuses and adjoining anatomical structures to 3 Tesla MRI the nasal cavities and paranasal sinuses of 13 horses were examined using CT and 3 Tesla MRI.ResultsComparison of CT and MRI images of the paranasal sinuses, nasal cavities and adjoining anatomical structures of 13 healthy horses showed that the inter-rater agreement for the CT examinations was higher than the inter-rater agreement for the MRI examinations. CT images proved to be significantly higher rated for the depiction of cortical bone, while MR images were higher rated for the appearance of soft tissues. For the distinction between different tissues or anatomical structures the MR images were significantly higher rated and especially T2-weighted sequences allowed for a good distinction between delicate structures. None of the MRI sequences produced an exact depiction of the lumen of the nasomaxillary aperture while the CT with a bone window allowed for a satisfying visualization.ConclusionThe CT is an imaging modality that produces high quality images within a short time when examining equine nasal cavities and paranasal sinuses. The strength of CT lies in the high quality depiction of large and delicate structures with high radiodensity. High field MRI with a field strength of 3 Tesla produces images of high quality that allow for the distinction of delicate soft tissue structures but requires long examination times. The high field strength of 3 Tesla magnetic imaging introduces new possibilities in tomographic soft tissue imaging of the equine head but cannot match up with the CT in terms of visualization of bone and total examination duration. Therefore, clinicians should consider the exact imaging needs in clinical cases to decide whether a single examination or a combination of both imaging techniques may promise the greatest benefit for the patient.

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Magnetic resonance imaging of melanomas in the head region of 3 horses

Cited by 3 publications

References 6 publications

Application and indications of magnetic resonance imaging and computed tomography of the equine head

Application and indications of magnetic resonance imaging and computed tomography of the equine head

Spinal ataxia due to cervical cord compression caused by a melanoma in the extradural atlanto-occipital neck region in an ataxic pony

Comparison of image quality and in vivo appearance of the normal equine nasal cavities and paranasal sinuses in computed tomography and high field (3.0 T) magnetic resonance imaging

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