A novel case of false-positive I-131 whole-body scan in thyroid carcinoma caused by subdural hematoma

Iodine-131 whole-body scintigraphy has been used extensively to detect thyroid remnants as well as metastatic disease in thyroid carcinoma postthyroidectomy. Over the years, numerous causes of false-positive scans have been reported. The authors report a novel case of a false-positive result resulting from a subdural hematoma mimicking a skull or cerebral metastasis.