Imaging

Authors: Jason B. Arble , John S. Mattoon , Wm. Tod Drost , Steven E. Weisbrode , Peter A. Wassenaar , Xueliang Pan , Robert J. Hunt , James K. Belknap
Journal: Veterinary Radiology and Ultrasound

ABSTRACT

Category: Equine - Imaging - Laminitis - MRI
Authors: Relave, F.; Meulyzer, M.; Alexander, K.; Beauchamp, G.; Marcoux, M.
Journal: Equine Veterinary Journal

Reasons for performing study: Lesions located on the medial malleolus of the tarsocrural joint can be difficult to image radiographically. Ultrasonography allows evaluation of articular cartilage and subchondral bone.

Objectives: To compare dorso30° lateral-plantaromedial-oblique (DL-PlMO) and dorso45° views to detect lesions on the medial malleolus, to validate the use of ultrasonography to show lesions in the tarsocrural joint and to compare its sensitivity to radiography.

Authors: Blunden, A.; Murray, R.; Dyson, S.
Journal: Equine Veterinary Journal

Reasons for performing study: Lameness associated with lesions of the deep digital flexor tendon (DDFT) in the digit is now recognised as an important cause of lameness, but there is currently limited information about the pathological nature of the lesions.

Objectives: To compare: signal intensity changes on magnetic resonance images with histopathology; and histopathological changes in the DDFT from horses with no history of foot-related lameness (Group C) and horses with lesions of the DDFT confirmed using magnetic resonance imaging (MRI) (Group D).

Authors: Del Chicca, F.; Kuemmerle, J.M.; Ossent, P.; Nitzl, D.; Fuerst, A.; Ohlerth, S.
Journal: Equine Veterinary Education

The radiological examination of bone lesions can be challenging, considering the complex superimposition of the 3D anatomy of a region on to a 2D image. This report describes the findings achievable with different diagnostic imaging modalities (radiography, arthrography, spiral computed tomography) and the correlation with the post mortem and histopathological findings in a horse with a fracture associated with an osseous cyst-like lesion in the third phalanx.

Category: Case study - CT - Equine - Imaging
Authors: Sherlock, C.; Mair, T.; Blunden, T.
Journal: Equine Veterinary Journal

Reasons for performing study: Erosion of the palmar (flexor) aspect of the navicular bone is difficult to diagnose with conventional imaging techniques.

Objectives: To review the clinical, magnetic resonance (MR) and pathological features of deep erosions of the palmar aspect of the navicular bone.

Methods: Cases of deep erosions of the palmar aspect of the navicular bone, diagnosed by standing low field MR imaging, were selected. Clinical details, results of diagnostic procedures, MR features and pathological findings were reviewed.

Category: Equine - Imaging - Lameness - MRI
Authors: White, J.M.; Mellor, D.J.; Duz, M.; Lischer, C.J.; Voute, L.C.
Journal: Equine Veterinary Journal

Abstract:

Reasons for performing study: Rigorous evaluation of practicable methods for the objective assessment of foot conformation has not been performed.

Objectives: To assess the practicability, precision and accuracy of the process of obtaining measurements of horses' feet using photography and image processing software.

Authors: SARAH SMITH, SUE J. DYSON, RACHEL C. MURRAY
Journal: Veterinary Radiology and Ultrasound

Distal sesamoidean ligament injury is a recognized cause of lameness but diagnosis using ultrasonography is sometimes difficult. Herein, we describe the normal appearance of the distal sesamoidean ligaments on magnetic resonance (MR) images and the changes that occur when the ligaments are injured. The appearance of the distal sesamoidean ligaments on MR images from 66 control horses and 58 horses with distal sesamoidean desmitis were described and the cross-sectional area and signal intensity of the ligaments measured.

Category: Equine - Imaging - Ligament - MRI
Authors: MEREDITH A. SMITH, SUE J. DYSON , RACHEL C. MURRAY
Journal: Veterinary Radiology and Ultrasound

Collagen fibers oriented at 55° to the static magnetic field (B0) are characterized by an artifactual increase in signal intensity due to the magic angle effect. We hypothesized that there would be increased signal intensity in the collateral ligaments of the distal interphalangeal joint and oblique sesamoidean ligaments when these ligaments were at angles approaching 55° to a horizontal B0 during standing magnetic resonance (MR) imaging. MR imaging was performed on four cadaver forelimbs in a 0.27 T standing system.

Category: Equine - Imaging - Ligament - MRI
Authors: Dyson, S.; Blunden, T.; Murray, R.
Journal: Equine Veterinary Journal

Reasons for performing study: Magnetic resonance imaging (MRI) is used with increasing frequency to diagnose injuries of the collateral ligaments (CLs) of the distal interphalangeal (DIP) joint, but the results have not been verified by histology and the mechanism of injury is poorly understood. Hypothesis: Abnormal signal intensity and tissue contour represents change in tissue structure detected on histology. Objectives: To compare results in horses free from and those with chronic lameness and to describe possible progression of lesions.

Authors: Jonathan D. C. Anderson, BVM&S; Larry D. Galuppo, DVM, DACVS; Bradd C. Barr, DVM, DACVP; Sarah M. Puchalski, DVM, DACVR; Melinda
Journal: Journal of the American Veterinary Medical Association

Objective—To describe clinical and scintigraphic abnormalities in horses with a bone fragility disorder. Design—Retrospective case series. Animals—16 horses with scintigraphic evidence of multiple sites of increased radiopharmaceutical uptake (IRU). Procedures—Medical records were reviewed for information on signalment; history; clinical, clinicopathologic, and diagnostic imaging findings; and treatment. Follow-up information was obtained through telephone interviews with owners. Results—Horses ranged from 4 to 22 years old; there were 8 castrated males and 8 females.