Abstract
A 39-year-old man presented with a substernal mass of possible thyroidal cause. A Tc-99m sodium pertechnetate thyroid scan suggested functional substernal thyroid tissue. An 1-123 thyroid scan demonstrated a normal thyroid. The pertechnetate accumulation was assumed to be uptake in a gastric pull-through previously performed for esophageal carcinoma. The disparity between Tc-99m pertechnetate and I-123 images suggested the nonthyroidal cause of this finding. This case emphasizes the need to image mediastinal lesions that accumulate pertechnetate with a later radioiodine study
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