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Unusual Scintigraphic Findings in a Thyroid Adenoma

Department of Nuclear Medicine, Division of Endocrinology and Metabolism, Mount Sinai Medical Center, New York, New York

Correspondence: For correspondence contact: Sumathi Murthy, MD, Mount Sinai Medical Center, Department of Nuclear Medicine, Box 1141, One Gustave L. Levy Pl., New York, New York 10029.

ABSTRACT

Thallium imaging is increasingly being used to evaluate the thyroid. Uptake patterns of ²⁰¹TI in benign and malignant thyroid nodules have been described. Thallium localizes all thyroid tissue with possibly different rates of washout in benign and malignant nodules. This case demonstrates a follicular adenoma presenting ¹²³I as a clinically palpable nodule with nonvisualization of the remainder of the thyroid gland consistent with the diagnosis of an autonomously hyperfunctioning module. Subsequent thallium scanning revealed a complete reversal of tracer distribution with lack of uptake of ²⁰¹TI in the nodule while the rest of the gland showed normal thallium accumulation. Surgical excision of the nodule demonstrated follicular adenoma.

FOOTNOTES

Reprints are not available from the author.