10-year-old male neutered Beagle | American College of Veterinary Radiology

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~8 months prior to presentation: seen at rDVM for decreased energy level – diagnosed with Lyme disease and treated with doxycycline
~3 months prior to presentation: seen at rDVM for episode of acute pain (localization not reported) which progressed to a hunched posture and apparent neck pain over several weeks. This seemed to partially improve with prednisone and other analgesics (medication not reported).
Given lack of complete response, presented for further work up of neck pain and possible cervical mass discovered on palpation.

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T-100.7F, HR-60, RR-32, BW-14.5kg, mm-pink, moist
Abd-tense, non-painful, cranial organomegaly (likely liver)
Large firm mass palpated above thoracic inlet on right, seems stiff with neck palpation

Elevated ALT (228; rr14-86)

• FNA: consistent with thyroid carcinoma
• Occam’s razor — spinal cord lesions are likely same?
• Palliative radiation therapy resulted in excellent clinical response (marked pain reduction)
– Spinal lesions seem RT responsive (supports idea that all lesions are thyroid origin?)
• Recurrence of neck pain 3 months later

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