Vertebral hemangioma mimicking a metastatic bone lesion in well-differentiated thyroid carcinoma.

The authors report a case of abnormal accumulation of I-131 in a thoracic vertebra in a patient with a well-differentiated thyroid carcinoma. The presumptive diagnosis was metastatic bone disease. Further diagnostic work-up confirmed a benign bone lesion. Bone metastasis, when shown on I-131 whole-body scintigraphy, usually supports a change in the staging and therapeutic approach to a patient with thyroid carcinoma. The authors believe that, although an infrequent lesion, the differential diagnosis of abnormal accumulation of I-131 in the body of a vertebra in patients with well-differentiated thyroid carcinoma should raise the possibility of a benign hemangioma. Complete work-up of the suggested bone metastatic lesion should be performed before tumor restaging and I-131 therapy is recommended.