Phillip F. Steyn, BVSc
Associate Professor
Phone: (970) 297-0322
Fax: (970) 297-1254
Email:Phillip.Steyn@colostate.edu
Office: 152 James L. Voss Veterinary Teaching Hospital
Diplomate, American College of Veterinary Radiology
Degrees
- M.S., Veterinary Medical Sciences, Texas A & M University, College Station
- B.VSc., University of Pretoria, South Africa
- B.Sc., Physiology, Microbiology, University of the Orange Free State, South Africa
Research Interests
Dr. Steyn serves as staff radiologist and also chief of the nuclear medicine service. He came to
Colorado State University as a veterinarian, a staff radiologist and assistant professor in 1989
and initiated and developed the nuclear medicine service that provides scintigraphy
support for clinical and research activities in both small and large animals. The nuclear medicine service
now includes an outpatient service for diagnostic scintigraphic studies as well as radio-iodine
(131I) therapy for cats and dogs that suffer from thyroid disorders. Dr. Steyn is currently also involved
in a project using 153Sm to treat bone cancer in dogs and teaches in each of the 4 years
of the professional veterinary medicine (PVM) curriculum as well as in graduate level courses for
residents and graduate students.
Figure 1. A nuclear medicine bone scan using 99mTc-HDP as
a radiopharmaceutical, showing multiple bone cancer (osteosarcoma) lesions involving the ribs of a canine
patient.
Figure 2. A Tc-99m-04 scan on a cat,
showing bilaterally enlarged thyroids, compatible with hyperthyroidism; the most commonly diagnosed
endocrinological disorder in cats.
Selected Publications
Steyn PF , Uhrig J. The role of protective lead clothing in reducing radiation
exposure rates to personnel in an equine nuclear medicine clinic. In press, Vet Rad and Ultrasound 2005.
Whittemore JC, Gionfriddo JR Steyn PF, Ehrhart EJ. Indium-111 labeled vitamin B12
imaging of a ciliary adenoma with concurrent grade 2 soft tissue sarcoma of the leg in a Labrador
Retriever. Veterinary Ophthalmology 2004 May-Jun;7(3):209-12.
Laflin SL, Steyn PF, VanMetre DC, Uhrig JL, Callan RJ. Evaluation and treatment
of decreased libido associated with painful lumbar lesions in two bulls. J Am Vet Med Assoc. 2004
Feb 15;224 (4):565-70, 533.
Cruz R, Steyn PF, Monet E, Shelly S, Hays C. Use of positive contrast
rhinography and intranasal sinography for diagnosis of a nasofacial sinus tract in a dog. J Am Vet Med
Assoc. 2003 Jun 1;222(11):1569-72, 1547.
Southwood LL, Kawcak CE, McIlwraith CW, Frisbie DD, Steyn PF.
Use of scintigraphy for assessment of fracture healing and early diagnosis of osteomyelitis following
fracture repair in rabbits. Am J Vet Res. 2003 Jun;64(6):736-45.
Jankowski MK, Steyn PF, Lana SE, Dernell WS, Blom CM, Uhrig JL, Laferty M, Withrow SJ.
Nuclear Scanning with 99m-Tc-HDP for the initial evaluation of osseous metastasis in canine osteosarcoma.
Veterinary and Comparative Oncology, 2003;1,3:152-158
Leibman NF, Kuntz CA, Steyn PF, Fettman MJ, Powers BE, Withrow SJ, Dernell WS.
Accuracy of radiography, nuclear scintigraphy, and histopathology for determining the proximal extent of
distal radius osteosarcoma in dogs. Vet Surg. 2001 May-Jun;30(3):240-5.
Westfall DS, Twedt DC, Steyn PF, Oberhauser EB, VanCleave JW. Evaluation of esophageal
transit of tablets and capsules in 30 cats. J Vet Intern Med. 2001 Sep-Oct;15(5):467-70
East LM, Trumble TN , Steyn PF, Savage CJ, Dickenson CE, Traub-Dargatz JL.
The Application of Technetium-99m Hexamethylptopyleneamine oxime ( 99mTc-HMPAO) Labeled White Blood Cells
for the Diagnosis of Right Dorsal Ulcerative Colitis in Two Horses.
Veterinary Radiology and Ultrasound, 2000;41:360-364.
Steyn PF , Ramey DW, Kirschvink J and Uhrig J. Effect of Static Magnetic Field
Therapy on Blood Flow to the Metacarpus in Horses. J Am Vet Med Assoc 2000; 217:874-877.
Kawcak C, McIlwraithe WC, Nordin R, Park R, Steyn PF. Clinical effects of exercise
on subchondral bone of carpal and metacarpophalangeal joints in horses. Am J Vet Res, 2000;21:1252-1258
Leibman, NF, Kuntz CA, Steyn PF, Fettman MJ, Powers BE, Withrow SJ, Dernell WS.
Accuracy of radiography, nuclear scintigraphy, and histopathology for determining the proximal extent
of distal radius osteosarcoma in dogs. Vet Surg. 2001 May-Jun;30(3):240-5.
Patricelli, AJ, Lappin MR, Steyn PF. Mammary Gland Uptake of Tc-pertechnetate in a cat
with drug induced Gynecomastia. Veterinary Radiology and Ultrasound, 1999;40:87-88
East LM, Steyn PF, Dickinson CE, Frank AA. Occult osseous metastasis of a colonic
adenocarcinoma visualized with technetium tc 99m hydroxymethylene diphosphate scintigraphy in a horse. J Am
Vet Med Assoc, 1998;213:1167-1170.
Gibson TE, Roberts SM, Severin GA, Steyn PF, Wrigley RH. Comparison of Gonioscopic and
Ultrasound Biomicrcoscopy for Evaluating the Iridocorneal Angle in Dogs. J Am Vet Med Assoc,
1998;213:635-638.
Steyn PF, Twedt D, Toombs W. The Effects of Low Dose Intravenous Diazepam on the
Clearance Half-Time of 99mTc Sulfur Colloid Labeled Solid Food in the Normal Cat. Veterinary Radiology
and Ultrasound, 1998;38:469-473.
Ray CS, Baxter GM, McIlwraith CW, Trotter GW, Powers BE, Park RD, Steyn PF.
Development of Subchondral Cystic Lesions after Articular Cartilage and Subchondral Bone Damage in Young
Horses. Equine Veterinary Journal 1998;28:225-232.
Mailing Address
Environmental & Radiological Health Sciences
1681Campus Delivery
Colorado State University
Fort Collins, CO 80523
Phone: (970) 491-7038
Fax: (970) 491-2940
Email:
ERHSDepartment
