title: False-positive I-131 accumulation in a hepatic hydatid cyst.
abstract: In this report, a case of differentiated thyroid carcinoma having false-positive I-131 accumulation due to a large hydatid cyst in the liver is presented. Abdominal sonographic examination of a 37-year-old patient with differentiated thyroid carcinoma demonstrated an ovoid, complex cystic mass containing cystic parts as well as solid-appearing components in the right lobe of liver, which is concordant with a type CE-3 hydatid cyst. The postablative whole-body scan obtained 10 days after 100 mCi I-131 therapy displayed intense and homogeneous uptake of radioiodine in the liver. Hepatic cystic mass was removed, and postoperative histologic evaluation confirmed hydatid disease. Some cystic lesions of the kidney and liver have been previously reported as causes of false-positive radioiodine accumulation.
authors.affiliation: Department of Nuclear Medicine, Ege University Medical Faculty, Bornova-Izmir, Turkey. ozomur@yahoo.com
authors.forename: Ozgür
authors.initials: O
authors.lastname: Omür
authors.forename: Süha Süreyya
authors.initials: SS
authors.lastname: Ozbek
authors.forename: Ayçsegül
authors.initials: A
authors.lastname: Akgün
authors.forename: Bülent
authors.initials: B
authors.lastname: Yazici
authors.forename: Nadide
authors.initials: N
authors.lastname: Mutlukoca
authors.forename: Zehra
authors.initials: Z
authors.lastname: Ozcan
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis; D000328:Adult; D002291:Carcinoma, Papillary / Q000601:surgery; D003266:Continuity of Patient Care; D003937:Diagnosis, Differential; D004444:Echinococcosis, Hepatic / Q000000981:diagnostic imaging / Q000378:metabolism* / Q000601:surgery; D005189:False Positive Reactions; D005260:Female; D006044:Goiter, Nodular / Q000601:surgery; D006801:Humans; D007457:Iodine Radioisotopes / Q000493:pharmacokinetics* / Q000627:therapeutic use; D008099:Liver / Q000473:pathology; D008113:Liver Neoplasms / Q000175:diagnosis; D011184:Postoperative Period; D013964:Thyroid Neoplasms / Q000601:surgery; D013965:Thyroidectomy; D014463:Ultrasonography
chemical_list: D007457:Iodine Radioisotopes