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

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          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 18F‐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.

          Abstract

          The role of 18F‐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. This case suggested that FDG PET/CT may be used for staging feline thyroid carcinoma, and the results contributed to treatment recommendations.

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          Most cited references20

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          Clinical applications of PET in oncology.

          Positron emission tomography (PET) provides metabolic information that has been documented to be useful in patient care. The properties of positron decay permit accurate imaging of the distribution of positron-emitting radiopharmaceuticals. The wide array of positron-emitting radiopharmaceuticals has been used to characterize multiple physiologic and pathologic states. PET is used for characterizing brain disorders such as Alzheimer disease and epilepsy and cardiac disorders such as coronary artery disease and myocardial viability. The neurologic and cardiac applications of PET are not covered in this review. The major utilization of PET clinically is in oncology and consists of imaging the distribution of fluorine 18 fluorodeoxyglucose (FDG). FDG, an analogue of glucose, accumulates in most tumors in a greater amount than it does in normal tissue. FDG PET is being used in diagnosis and follow-up of several malignancies, and the list of articles supporting its use continues to grow. In this review, the physics and instrumentation aspects of PET are described. Many of the clinical applications in oncology are mature and readily covered by third-party payers. Other applications are being used clinically but have not been as carefully evaluated in the literature, and these applications may not be covered by third-party payers. The developing applications of PET are included in this review.
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            The implication of lymph node metastasis on survival in patients with well-differentiated thyroid cancer.

            Though survival for well-differentiated thyroid cancer is very good, specific populations suffer greater recurrence and mortality. Defining these cohorts can significantly influence prognosis and extent of treatment. This study, using a large, multi-institutional database, seeks to determine how the presence of lymph node disease in patients with well-differentiated thyroid cancer affects outcome. The Surveillance, Epidemiology, and End Results (SEER) database is a large-scale sample of 14 per cent of the U.S. population. It was used to identify patients with papillary and follicular thyroid carcinomas and identify the prognostic implications of lymph node metastasis. Additional factors, including presence of metastasis, age, and tumor size, were compared using multivariate and chi2 analyses. Of 19,918 patients identified, lymph node status was known for 9,904 (49.7%). On multivariate analysis, age > 45 years, presence of distant metastasis, large tumor size, and lymph node involvement significantly predicted poor outcome. Overall survival at 14 years was 82 per cent for node negative and 79 per cent for node positive patients (P < 0.05). This study shows that the survival of patients with well-differentiated thyroid cancer is adversely affected by lymph node metastases. The optimum treatment for this cohort needs further delineation, as particular populations are at greater risk of recurrence and death.
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              Changes in clinical and laboratory findings in cats with hyperthyroidism from 1983 to 1993.

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                Author and article information

                Contributors
                kangbt@chungbuk.ac.kr
                Journal
                Vet Med Sci
                Vet Med Sci
                10.1002/(ISSN)2053-1095
                VMS3
                Veterinary Medicine and Science
                John Wiley and Sons Inc. (Hoboken )
                2053-1095
                13 March 2023
                May 2023
                : 9
                : 3 ( doiID: 10.1002/vms3.v9.3 )
                : 1026-1030
                Affiliations
                [ 1 ] Laboratory of Veterinary Internal Medicine College of Veterinary Medicine, Chungbuk National University Cheongju Republic of Korea
                Author notes
                [*] [* ] Correspondence

                Byeong‐Teck Kang, Laboratory of Veterinary Internal Medicine, College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea.

                Email: kangbt@ 123456chungbuk.ac.kr

                Author information
                https://orcid.org/0000-0002-0351-1477
                https://orcid.org/0000-0002-3810-4193
                https://orcid.org/0000-0003-1372-4430
                https://orcid.org/0000-0002-9816-6900
                https://orcid.org/0000-0001-7162-9592
                https://orcid.org/0000-0002-8882-2329
                https://orcid.org/0000-0002-8043-0152
                https://orcid.org/0000-0002-4471-4342
                Article
                VMS31106
                10.1002/vms3.1106
                10188059
                36913242
                c33b4095-0b23-4cc7-8c92-f2a1958636ef
                © 2023 The Authors. Veterinary Medicine and Science published by John Wiley & Sons Ltd.

                This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

                History
                : 24 January 2023
                : 19 July 2022
                : 06 February 2023
                Page count
                Figures: 4, Tables: 0, Pages: 5, Words: 3101
                Funding
                Funded by: Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry and Fisheries , doi 10.13039/501100003668;
                Award ID: 322095‐04
                Categories
                Case Report
                CATS
                Case Reports
                Custom metadata
                2.0
                May 2023
                Converter:WILEY_ML3GV2_TO_JATSPMC version:6.2.8 mode:remove_FC converted:16.05.2023

                cat,fdg pet/ct,thyroid carcinoma
                cat, fdg pet/ct, thyroid carcinoma

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