title: The helmet sign: Physiologic radioactive accumulation after 131I therapy--a case report.
abstract: After 131I radioablative treatment, a 51-y-old woman underwent whole-body (131)I scanning, which revealed intense uptake along the periphery of the skull. The patient disclosed that she had not washed her hair because she had obtained a new hairstyle between the 131I treatment and the scan. The intense uptake along the periphery of the skull represented radioactive physiologic accumulation at the patient's scalp.
authors.affiliation: Department of Diagnostic Radiology, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA.
authors.forename: Lorraine
authors.initials: L
authors.lastname: Ash
authors.forename: Bohdan
authors.initials: B
authors.lastname: Bybel
authors.forename: Donald
authors.initials: D
authors.lastname: Neumann
authors.forename: Wendy
authors.initials: W
authors.lastname: Beebe
mesh_terms: D016477:Artifacts; D005189:False Positive Reactions; D005260:Female; D006257:Head / Q000000981:diagnostic imaging*; D006801:Humans; D007457:Iodine Radioisotopes / Q000493:pharmacokinetics / Q000627:therapeutic use; D008875:Middle Aged; D011877:Radionuclide Imaging; D012680:Sensitivity and Specificity; D013964:Thyroid Neoplasms / Q000532:radiotherapy*; D014915:Whole-Body Counting
chemical_list: D007457:Iodine Radioisotopes