False-Positive Uptake of 131I Due to Tubal Ligation in a Patient With Papillary Thyroid Cancer

A 39-year-old woman with papillary thyroid cancer underwent 131I therapy after thyroidectomy. Posttherapeutic 131I whole-body scan accidentally showed symmetric "hot spots" in the pelvic region beyond known bone metastases. SPECT/CT was immediately added and revealed metal artifacts with 131I accumulation in the nearby uterus. Further inquiry discovered that she underwent tubal ligation 19 years ago. Our case demonstrates that 131I accumulation can occur at the site of oviducts many years after tubal ligation, which should be distinguished from 131I-avid metastases.

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