MRI

Authors: Liberty M. Getman DVM, Diplomate ACVS, Elizabeth J. Davidson DVM, Diplomate ACVS, Michael W. Ross DVM, Diplomate ACVS, Midge Leitch VMD, Diplomate ACVS, Dean W. Richardson DVM, Diplomate ACVS
Journal: Veterinary Surgery

Objectives: To (1) describe the computed tomography (CT) and magnetic resonance imaging (MRI) appearance of keratomas; (2) describe a CT- or MRI-assisted partial hoof wall resection technique for removal of keratomas; and (3) evaluate the morbidity and postoperative outcome of these horses.

Study Design: Case series.

Animals: Horses (n=10) with keratoma.

Category: CT - Equine - Imaging - MRI - Podiatry
Authors: SILKE HECHT, WILLIAM H. ADAMS, JILL NARAK, WILLIAM B. THOMAS
Journal: Veterinary Radiology and Ultrasound

Susceptibility artifacts due to metallic foreign bodies may interfere with interpretation of magnetic resonance (MR) imaging studies. Additionally, migration of metallic objects may pose a risk to patients undergoing MR imaging. Our purpose was to investigate prevalence, underlying cause, and diagnostic implications of susceptibility artifacts in small animal MR imaging and report associated adverse effects.

Category: Equine - MRI
Authors: JEREMIAH T. EASLEY, MATTHEW T. BROKKEN, CHAD J. ZUBROD, ALISON J. MORTON, KATHERINE S. GARRETT, SHANNON P. HOLMES
Journal: Veterinary Radiology and Ultrasound

Fourteen horses with septic arthritis underwent high-field (1.5 T) magnetic resonance imaging (MRI). Septic arthritis was diagnosed based on results from historical and clinical findings, synovial fluid analyses and culture, and radiographic, ultrasonographic, arthroscopic, and histopathologic findings.

Authors: KURT SELBERG, NATASHA WERPY
Journal: Veterinary Radiology and Ultrasound

Ungual cartilage ossification in the forelimb is a common finding in horses. Subtle abnormalities associated with the ungual cartilages can be difficult to identify on radiographs. Magnetic resonance (MR) imaging findings of 22 horses (23 forelimbs) with a fracture of the distal phalanx and ossified ungual cartilage were characterized and graded. All horses had a forelimb fracture. Eleven involved a left forelimb (seven medial; four lateral), and 12 involved a right forelimb (five medial; seven lateral). All fractures were nonarticular, simple in configuration, and nondisplaced.

Category: Equine - MRI - Traumatology
Authors: MICHAEL C. MAHER, NATASHA M. WERPY, LAURIE R. GOODRICH, C. WAYNE McIlWRAITH
Journal: Veterinary Radiology and Ultrasound

Magnetic resonance (MR) imaging is often performed to determine the cause of palmar heel pain. We evaluated how distension of the navicular bursa affected the MR appearance of the navicular bursa and associated structures. An MR evaluation was performed on normal cadaver limbs and cadaver limbs from horses with lameness localized to the foot. The normal navicular bursae were injected with 2, 4, or 6 ml of solution. The bursae of the feet from lame horses were injected with 4 or 6 ml, and the MR study was repeated.

Category: Equine - MRI
Authors: William M. Karlin, DVM, MS; Allison A. Stewart, DVM, MS; Sushmitha S. Durgam, BVSc; James F. Naughton, DVM, MS; Kristen J. O'Dell-Anderson, DVM, MS; Matthew C. Stewart, BVSc, PhD
Journal: American Journal of Veterinary Research

Objective—To evaluate tendon injuries in horses over a 16-week period by use of ultrasonography and low-field magnetic resonance imaging (MRI).

Sample—Tendons of 8 young adult horses.

Procedures—The percentage of experimentally induced tendon injury was evaluated in cross section at the maximal area of injury by use of ultrasonography and MRI at 3, 4, 6, 8, and 16 weeks after collagenase injection. The MRI signal intensities and histologic characteristics of each tendon were determined at the same time points.

Category: Equine - MRI - Tendon - Ultrasound
Authors: Géraldine E. Bolen, DVM, MSc; Dimitri Haye; Robert F. Dondelinger, DM, PhD; Laurent Massart, DVM; Valeria Busoni, DVM, PhD
Journal: American Journal of Veterinary Research

Objective—To assess the impact of cycles of freezing and thawing on magnetic resonance (MR) images (obtained by use of a 3-T magnet) of equine feet examined ex vivo.

Sample—9 forelimbs from 9 horse cadavers.

Category: Equine - MRI
Authors: ANNAMARIA NAGY, SUE DYSON
Journal: Veterinary Radiology & Ultrasound

Cadaver carpi of 30 mature horses with no history of carpal or proximal metacarpal pain were examined using low-field (0.27 T) and high-field (1.5 T) magnetic resonance imaging (MRI). Normal MRI anatomy in transverse, sagittal, and dorsal plane images was determined by comparison with anatomical specimens and standard texts. Subchondral bone and cortical bone thickness measurements were obtained from standardised sites.

Category: Equine - Imaging - MRI
Authors: A. NAGY, S. DYSON
Journal: Equine Veterinary Journal

Reasons for performing the study: Detailed magnetic resonance imaging (MRI) and histological appearances of the accessory ligament of the deep digital flexor tendon (AL-DDFT) have not been documented previously in detail.

Objectives: To: 1) describe anatomical connections between the AL-DDFT and adjacent structures; 2) describe high-field and low-field MRI and histological appearances of the AL-DDFT in the forelimb of horses with no carpal or proximal metacarpal pain; and 3) assess the relationship between age, breed, gender, height, weight and MRI findings.

Category: Equine - Imaging - Ligament - MRI
Authors: M. BIGGI, S. DYSON
Journal: Equine Veterinary Journal

Reasons for performing study: Distal border fragments of the navicular bone can be seen in lame and nonlame horses and their clinical significance remains open to debate.

Objectives: To describe the magnetic resonance imaging (MRI) appearance of distal border fragments and the adjacent navicular bone. To investigate the relationship between fragments and other abnormalities of the navicular bone and the distal sesamoidean impar ligament (DSIL).

Category: Equine - Imaging - Lameness - MRI