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 25-28 September, 2018 | Singapore
attached to the host or may be interrupted during feeding. These ticks occasionally leave the canine host and are able to find another host, infest and
finally transmit pathogens. This is rather important for companion animals living in close contact with humans.
Epidemiological tick control and preventative measures
WSV18-0095
ONCOLOGY
DIAGNOSIS AND TREATMENT OF ENDOCRINE NEOPLASIA IN DOGS AND CATS
C. Cannon1, S. Ryan1
1University of Melbourne, U-Vet Animal Hospital, Melbourne, Australia
DIAGNOSIS AND TREATMENT OF ENDOCRINE NEOPLASIA IN DOGS AND CATS
Claire Cannon BVSc (hons) DACVIM (Oncology) MANZCVS
Stewart Ryan BVSc (hons) MS DACVS MANZCVS University of Melbourne U-Vet Animal Hospital claire.cannon@unimelb.edu.au stewart.ryan@unimelb.edu.au
Learning objective: Develop an algorithm for diagnosis and staging of thyroid tumours in dogs and adrenal tumours in dogs and cats. Understand rational application of different treatment modalities in different situations.
Thyroid tumours:
Cats with thyroid tumours typically present for clinical signs of hyperthyroidism, dogs for a palpable mass. Although dogs with thyroid tumours are rarely hyperthyroid, elevated T4 in a dog is almost certainly due to a thyroid tumour (rather than hyperplasia). Thyroid carcinoma represents the least common cause of
feline hyperthyroidism. Once a thyroid tumour in a dog
is palpable, it is almost certainly malignant. Because
size and mobility is an important prognostic factor in canine thyroid tumours, early detection via routine
neck palpation as part of regular physical examination should be emphasised in dogs. Carcinoma should be considered in hyperthyroid cats with extremely elevated T4, very large or fixed goitre. Screening for metastasis
is warranted in cats with suspected thyroid carcinoma, and treatment with surgery or I 131 may be more effective than medical management, however the true best approach is not defined.
In evaluation of a dog with a suspected thyroid tumour, our general approach is as follows:
1. Confirm cervical mass is of thyroid origin and assess resectability - thyroid origin can be confirmed with imaging (ultrasound or CT scan) and cytology, though cytology is not specific for malignancy (often thyroid carcinomas have few cytologic criteria of malignancy). Mobility is best assessed under heavy sedation or general anesthesia. If a thyroid tumour appears to be relatively fixed/immobile, contrast
CT scan should be avoided if I 131 treatment is a possibility. Total T4 should be evaluated in every case (+/- TSH, free T4 if TT4 is low)
43RD WORLD SMALL ANIMAL VETERINARY ASSOCIATION CONGRESS AND 9TH FASAVA CONGRESS
  Although strategies to reduce populations of vector ticks through area-wide application of acaricides (chemicals that will kill ticks and mites) and control of tick habitats (e.g., leaf litter and brush) have been effective in small- scale trials, chemical removal of ticks from wildlife habitats are impossible. Community-based, integrated, tick-management strategies may prove to be an effective public health response to reduce the incidence of tick- borne infections. This includes general preventative measures of dog owners. However, limiting exposure to ticks is currently the most effective method of prevention.
1. Sonenshine DE, Roe RM. Biology of ticksOxford University Press. 2013, p
2. Hoogstraal H, Aeschlimann A. Tick-host specificity. Bulletin de la société entomologique suisse 1982; 55: 5-32.
3. Bonnet S, Kazimírová M, Richardson J, Šimo L. Tick Saliva and Its Role in Pathogen Transmission Skin and Arthropod Vectors. Elsevier.2018, p 121-191.
4. www.CDC.org 2018 Lyme and other tickborne diseases
5. www.CVBD.com 2018 Tick-borne Diseases
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