PT - JOURNAL ARTICLE AU - Lorraine Ash AU - Bohdan Bybel AU - Donald Neumann AU - Wendy Beebe TI - The Helmet Sign: Physiologic Radioactive Accumulation After <sup>131</sup>I Therapy—A Case Report DP - 2004 Sep 01 TA - Journal of Nuclear Medicine Technology PG - 164--165 VI - 32 IP - 3 4099 - http://tech.snmjournals.org/content/32/3/164.short 4100 - http://tech.snmjournals.org/content/32/3/164.full SO - J. Nucl. Med. Technol.2004 Sep 01; 32 AB - After 131I radioablative treatment, a 51-y-old woman underwent whole-body 131I 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.