title: Detecting metastatic neck lymph nodes in papillary thyroid carcinoma by 18F-2-deoxyglucose positron emission tomography and Tc-99m tetrofosmin single photon emission computed tomography.
abstract: The aim of this study was to evaluate the usefulness of 18-fluoro-2-deoxyglucose (FDG) positron emission tomography (PET) and technetium-99m tetrofosmin (Tc-99m TF) single photon emission computed tomography (SPECT) to detect metastatic neck lymph nodes (LN) in papillary thyroid carcinoma (PTC) after total thyroidectomy and radioiodine-131 (I-131) treatments in patients with elevated serum human thyroglobulin (hTg) levels but negative I-131 whole body scan (WBS). Thirteen PTC patients underwent nearly total thyroidectomy and I-131 treatments with proven neck LN metastases were included in this study. All subjects had negative I-131 WBS and elevated hTg levels (hTg > or = 10 mu IU/ml) under thyroid-stimulating hormone (TSH) stimulation (TSH > or = 30 mu IU/ml). FDG-PET and Tc-99m TF SPECT were used to detect metastatic neck LN in PTC. FDG-PET could detect all of the 13 (100%) patients with metastatic neck LN, but Tc-99m TF SPECT revealed lesions in only 8 out of 13 (61.5%) patients (p < 0.05). This study demonstrated that FDG-PET is more sensitive than Tc-99m TF SPECT to detecting metastatic neck LN in PTC with elevated serum hTg levels but negative I-131 WBS.
authors.affiliation: Department of Surgery, Show Chwan Memorial Hospital, Changhua, Taiwan.
authors.forename: Yi-Ju
authors.initials: YJ
authors.lastname: Wu
authors.forename: Hurng-Sheng
authors.initials: HS
authors.lastname: Wu
authors.forename: Ruoh-Fang
authors.initials: RF
authors.lastname: Yen
authors.forename: Yeh-You
authors.initials: YY
authors.lastname: Shen
authors.forename: Chia-Hung
authors.initials: CH
authors.lastname: Kao
mesh_terms: D000328:Adult; D000368:Aged; D002291:Carcinoma, Papillary / Q000097:blood / Q000000981:diagnostic imaging* / Q000473:pathology; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D007457:Iodine Radioisotopes; D008197:Lymph Node Excision; D008198:Lymph Nodes / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D009943:Organophosphorus Compounds; D015609:Organotechnetium Compounds; D019275:Radiopharmaceuticals; D012680:Sensitivity and Specificity; D013954:Thyroglobulin / Q000097:blood; D013964:Thyroid Neoplasms / Q000097:blood / Q000000981:diagnostic imaging* / Q000473:pathology; D014055:Tomography, Emission-Computed; D015899:Tomography, Emission-Computed, Single-Photon; D014915:Whole-Body Counting
chemical_list: D007457:Iodine Radioisotopes; D009943:Organophosphorus Compounds; D015609:Organotechnetium Compounds; D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18; C078700:technetium tc-99m tetrofosmin; D013954:Thyroglobulin