Abstract
Here we define two cases with a diffuse soft tissue uptake of I-131 in neck and mediastinum on post ablation scan. A diffuse uptake of I-131 in the soft tissue is very rare. In this case report we review the literature and discuss the mechanism of the uptake.
Highlights
The incidence of thyroid carcinoma is increasing and I-131 remnant ablation is used in some patients to increase the sensitivity of thyroglobulin tests and to decrease the recurrence [1]
A thyroid carcinoma located in an ovarian teratoma is rare [2] with 5 % metastases rate [3]
There were many pitfalls that were defined in the literature in the post-ablative I-131 scans
Summary
The incidence of thyroid carcinoma is increasing and I-131 remnant ablation is used in some patients to increase the sensitivity of thyroglobulin tests and to decrease the recurrence [1]. A false positive uptake of I-131 demonstrated on whole body imaging following ablative therapy is a challenge for the clinician. We define two cases with diffuse I-131 uptake in neck and mediastinum in which the above mentioned situations are absent. A thyroid carcinoma located in an ovarian teratoma is rare [2] with 5 % metastases rate [3].
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