Imaging

Authors: MICHAEL SCHRAMME , ZOLTAN KEREKES , STUART HUNTER , KRISZTINA NAGY , ANTHONY PEASE
Journal: Veterinary Radiology & Ultrasound

Fibrocartilage degeneration is the earliest pathologic finding in navicular disease but remains difficult to detect, even with magnetic resonance (MR) imaging. We hypothesized that injection of the navicular bursa with saline would improve accuracy of MR imaging evaluation of palmar fibrocartilage. Thoracic limbs were collected from 11 horses within 6 h of death. Imaging was performed with a 1.5 T magnet using sagittal 2D proton density and transverse 3D FLASH sequences with fat saturation.

Category: Equine - Imaging - MRI
Authors: VALERIE J. MOORMAN , JOHN F. MARSHALL , DUSTIN V. DEVINE , MARK PAYTON , HENRY W. JANN , ROBERT BAHR
Journal: Veterinary Radiology & Ultrasound

Radiographic diagnosis of equine bone disease using digital radiography is prevalent in veterinary practice. However, the diagnostic quality of digital vs. conventional radiography has not been compared systematically. We hypothesized that digital radiography would be superior to film-screen radiography for detection of subtle lesions of the equine third metacarpal bone. Twenty-four third metacarpal bones were collected from horses euthanized for reasons other than orthopedic disease.

Category: Equine - Imaging - Radiography
Authors: Meehan, L.; Dyson, S.; Murray, R.
Journal: Equine Veterinary Journal

Reasons for performing study: Clinical, radiographic and scintigraphic signs associated with spondylosis of the equine thoracolumbar spine have been poorly documented.

Objectives: To establish an objective radiographic and scintigraphic grading system for spondylosis lesions; to estimate the prevalence of spondylosis in a population of horses with back pain; and to compare the results of radiography and scintigraphy

Authors: Withers, J.M.; Voûte, L.C.; Lischer, C.J.
Journal: Equine Veterinary Education

Interpretation of cervical radiographs can be challenging due to the complex anatomy and superimposition of osseous structures on either side of the vertebrae. This report describes the investigation of neck pain in a Thoroughbred gelding following a traumatic fall. Several imaging modalities were used to demonstrate the presence of a fracture of the left cranial articular process of the fourth cervical vertebra (C4), including nuclear scintigraphy, ultrasonography, oblique radiographic projections and a novel cineradiographic technique.

Authors: MARIANNA BIGGI , SUE J. DYSON , RACHEL C. MURRAY
Journal: Veterinary Radiology and Ultrasound

Our aims were to evaluate the pattern of radiopharmaceutical uptake in horses with lameness related to the metacarpophalangeal and/or metatarsophalangeal joint and compare the results with similar information from sound horses. It was hypothesized that there would be a difference in radiopharmaceutical uptake between the lame and contralateral limb in unilaterally lame horses and that there would be a difference between lame and sound horses. Nuclear scintigraphic images of 43 horses with forelimb lameness and 30 horses with hindlimb lameness were evaluated.

Authors: SUSANNE M. STIEGER-VANEGAS , HEGE KIPPENES-SKOGMO , EBBA NILSSON
Journal: Veterinary Radiology and Ultrasound

An enostosis-like lesion was diagnosed in the left femur of a Swedish Warmblood horse that had a left hindlimb lameness of 3 weeks duration. With scintigraphy using technetium 99m-hydroxymethylene diphosphonate (99m Tc-HDP) a marked regional focal increase in radioactivity was identified in the medullary cavity of the left femur. Radiographically there was a corresponding focal increase in bone opacity in the middiaphysis of the left femur. Histopathologically, a 5 cm area of bone matrix was present in the diaphysis of the left femur and confirmed as an enostosis-like lesion.

Category: Case study - Equine - Imaging
Authors: R. C. Murray, MA, VetMB, MS, DipECVS, DipACVS, PhD, MRCVS, T. S. Mair, BVSc, PhD, DipECEIM, EIM, DESTS, MRCVS, C. E. Sherlock, BVetMed, MRCVS and A. S. Blunden, BVetMed, PhD, MRCPath, MRCVS
Journal: Veterinary Record

Eleven limbs taken postmortem from 10 lame horses were examined by MRI in a low-field 0·27T system designed for standing horses and a high-field 1·5T system used to examine anaesthetised horses. Nine limbs were examined in the foot/pastern region and two in the fetlock region, and the results were compared with gross pathological examinations and histological examinations of selected tissues.

Category: Equine - Imaging - MRI
Authors: Bourzac, C.; Alexander, K.; Rossier, Y.; Laverty, S.
Journal: Equine Veterinary Journal

Reasons for performing study: Osteochondritis dissecans (OCD) lesions of the femoropatellar (FP) joint are diagnosed routinely by radiography, but lesions located in the trochlear groove or without accompanying subchondral bone changes can be difficult to visualise. Ultrasonography allows evaluation of articular cartilage and subchondral bone in the FP joint.

Objectives: To document the radiographic and ultrasonographic appearance of OCD lesions in the equine FP joint, grade ultrasonographic lesions and compare their accuracy in the diagnosis of these lesions.

Authors: SUZANNE BRENNER , MARY BETH WHITCOMB
Journal: Veterinary Radiology and Ultrasound

The clinical and ultrasonographic features of seven horses with coxofemoral subluxation are presented. Affected horses included five adult geldings (11–20 years), one large pony (6 years) and a 3-month-old filly. All were lame at the walk except for the pony with grade 3/5 lameness. Lameness was acute in all horses, but three horses progressed after initial improvement. Crepitus, muscle atrophy, and pelvic asymmetry were inconsistent findings.

Authors: SARAH N. SAMPSON , ROBERT K. SCHNEIDER , PATRICK R. GAVIN , CHARLES P. HO , RUSSELL L. TUCKER , ELIZABETH M. CHARLES
Journal: Veterinary Radiology and Ultrasound

Seventy-two horses with recent onset of navicular syndrome and normal radiographs were assessed. Horses underwent magnetic resonance (MR) imaging of both front feet. All abnormalities were characterized and the most severe abnormality identified, if possible. Abnormal signal intensity in the navicular bone was the most severe abnormality in 24 (33%) horses. Pathologic change in the deep digital flexor tendon was the most severe abnormality in 13 (18%) horses. Pathologic change in the collateral sesamoidean ligament was the most severe abnormality in 11 (15%) horses.

Category: Equine - Imaging - MRI