Use of ¹⁸F‐2‐deoxy‐2‐fluoro‐D‐glucose positron emission tomography/computed tomography for staging thyroid carcinoma in a cat

Abstract

Thyroid nodules are common in older cats and are mostly benign; however, carcinomas may occur infrequently. In cats, thyroid carcinomas tend to be highly metastatic.The role of 18 F-2-deoxy-2-fluoro-D-glucose (FDG) positron emission tomography (PET)/computed tomography (CT) in human thyroid carcinoma has been well established. However, guidelines have not yet been established for veterinary medicine.Metastasis assessment has typically been performed using CT in veterinary medicine; however, it is poorly sensitive in detecting regional lymph nodes or distant metastases if these lesions are not abnormally contrast-enhanced, enlarged or cause overt mass effects. This case suggested that FDG PET/CT may be used for staging feline thyroid carcinoma, and the results contributed to treatment recommendations.

Case report: Evaluation of hindlimb ischemia using 18F-fluorodeoxyglucose positron emission tomography in a cat with cardiogenic arterial thromboembolism

“…Color Doppler ultrasonography revealed the absence of blood flow in femoral arteries toward the hindlimb. Hyperthyroidism was ruled out based on a normal thyroxine concentration (1.44 μg/dL, RI = 0.8–4.7 μg/dL) ( 19 ). ATE and congestive heart failure caused by cardiomyopathy were suspected based on the clinical presentation, including the presence of pulselessness, pain, pallor, paresis, and poikilothermia of the hindlimbs ( 3 ), along with the radiography, echocardiography, and laboratory results.…”