RT Journal Article SR Electronic T1 False-Positive Scalp Activity in 131I Imaging Associated with Hair Coloring JF Journal of Nuclear Medicine Technology JO J. Nucl. Med. Technol. FD Society of Nuclear Medicine SP 43 OP 45 DO 10.2967/jnmt.112.117416 VO 41 IS 1 A1 Di Yan A1 Mohan Doss A1 Ranee Mehra A1 Rosaleen B. Parsons A1 Barton N. Milestone A1 Jian Q. Yu YR 2013 UL http://tech.snmjournals.org/content/41/1/43.abstract AB A patient with metastatic papillary thyroid carcinoma (after surgical resection of tumor and positive lymph nodes) undergoing thyroid ablation therapy with 131I is described. Whole-body scintigraphy was performed 1 wk after ablation therapy to evaluate the presence of residual disease. The whole-body images demonstrated an artifact caused by tracer accumulation in the patient’s scalp related to recent hair coloring. Common etiologies of false-positive 131I scintigraphic findings are briefly reviewed. The importance of taking preventative measures to decrease the number of false-positive findings and recognizing these findings when they occur is discussed.