TURKIYE KLINIKLERI TIP BILIMLERI DERGISI, cilt.29, sa.6, ss.1792-1794, 2009 (SCI-Expanded)
As in all other arenas of nuclear medicine, the correct interpretation of whole body scans with I-131 requires a thorough understanding of normal radiotracer biodistribution. We report a false-positive radioiodine accumulation due to a musinous cyst in the external genitalia on I-131 whole body scan of a patient with papillary thyroid carcinoma. The images showed a large, round radioiodine accumulation that corresponded to a well circumscribed and stalked lesion that originated from the inner surface of left labium majus (4 x 5 cm in size) of the external genitalia. Complete resection and subsequent histopathological examination identified this mass as a musinous cyst. To the best our knowledge, it is the first report of a mucinous cyst in the external genitalia exhibiting I-131 uptake.