Pathology in Practice.

In collaboration with the American College of Veterinary Pathologists.

Thyroid storm in a dog secondary to thyroid carcinoma.

OBJECTIVE: To describe the clinical presentation, clinical course, and management of a dog with thyroid storm (TS) secondary to a functional thyroid carcinoma. CASE SUMMARY: A 12-year-old neutered female Golden Retriever was evaluated for severe weight loss, hyperthermia, and tachycardia. The dog had a ventral neck mass and markedly increased thyroxine concentration. Cervical ultrasound showed a suspected left thyroid mass with invasion into the jugular vein. Despite aggressive therapy, the patient progressed to a clinical TS. Postmortem examination was supportive of the clinical diagnosis. NEW OR UNIQUE INFORMATION PROVIDED: To the authors' knowledge, this is the first report of TS in a dog.