Case ReportCASE REPORTS

False-Positive Scalp Activity in 131I Imaging Associated with Hair Coloring

Di Yan, Mohan Doss, Ranee Mehra, Rosaleen B. Parsons, Barton N. Milestone and Jian Q. Yu
Journal of Nuclear Medicine Technology March 2013, 41 (1) 43-45; DOI: https://doi.org/10.2967/jnmt.112.117416

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Figures

  • FIGURE 1.
    FIGURE 1.

    Whole-body iodine scans before radioiodine ablation, in anterior and posterior projections. (A) Scan 1 mo before therapy. (B) Scan on day of radioiodine therapy. There is physiologic distribution of tracer in nasal mucosa, stomach, urinary bladder, and background.

  • FIGURE 2.
    FIGURE 2.

    (A) Whole-body iodine scan 1 wk after therapy. There is focal activity in lower neck consistent with iodine-avid tissue that had been treated with ablation dose. Liver activity is physiologic after therapy. There is diffuse helmet-shaped activity in head, likely in scalp or hair. (B) Images of head and neck in anterior, posterior, and lateral projections 10 d after therapy. Neck and nasal mucosal activity is present as expected. Activity in head is persistent and likely is in scalp, not in hair, because of patient’s reported good daily wash.

  • FIGURE 3.
    FIGURE 3.

    Whole-body iodine scan for routine follow-up 15 mo after ablation. No abnormal activity is identified to suggest iodine-avid lesion. No focal activity in skull or scalp region is seen.

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