title: Follicular thyroid carcinoma with an eggshell calcification: report of 3 cases.
abstract: OBJECTIVE
  The purpose of this series is to report 3 cases of follicular thyroid carcinoma with an eggshell calcification along with their imaging findings.
  
  
  METHODS
  Imaging findings on gray scale and power Doppler (PD) sonography (n = 3), computed tomography (CT; n = 3), and integrated fluorodeoxyglucose F 18 ((18)F-FDG) whole-body positron emission tomography (PET)/CT (n = 1) were assessed.
  
  
  RESULTS
  Of the 3 cases, two 75-year-old women had bone metastasis, and one 54-year-old woman had a thyroid incidentaloma on sonography. All 3 cases had a spherical mass with an interrupted eggshell calcification on gray scale sonography and CT; 2 revealed intranodular vascularity on PD sonography, and 1 showed intense hypermetabolism (maximum standardized uptake value, 7.9 g/mL) on integrated (18)F-FDG whole-body PET/CT.
  
  
  CONCLUSIONS
  Follicular carcinoma should be considered in the differential diagnosis of a thyroid nodule with an eggshell calcification.
authors.affiliation: Department of Radiology, Dongsan Medical Center, Keimyung University School of Medicine, 194 Dongsan-dong, Jung-gu, Daegu 700-712, Korea. sklee@dsmc.or.kr
authors.forename: Sang Kwon
authors.initials: SK
authors.lastname: Lee
authors.forename: Byung Hak
authors.initials: BH
authors.lastname: Rho
mesh_terms: D018263:Adenocarcinoma, Follicular / Q000175:diagnosis*; D000368:Aged; D001707:Biopsy, Needle; D001859:Bone Neoplasms / Q000000981:diagnostic imaging / Q000556:secondary; D002114:Calcinosis / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D033162:Incidental Findings; D008175:Lung Neoplasms / Q000000981:diagnostic imaging / Q000556:secondary; D008875:Middle Aged; D049268:Positron-Emission Tomography; D013964:Thyroid Neoplasms / Q000175:diagnosis*; D013965:Thyroidectomy; D014055:Tomography, Emission-Computed; D018615:Ultrasonography, Doppler, Color
chemical_list: D019788:Fluorodeoxyglucose F18