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Diffuse thyroid uptake

¹⁸F-FDG PET/CT

F23
Malignant melanoma.
Indication PET: Restaging.

Chronic thyroiditis. Hypothyroidism (on thyroxin).

FDG PET/CT shows mild, diffusethyroid uptake consistent with chronic thyroiditis.

Teaching point:
Diffuse increased thyroid uptake indicates chronic thyroiditis (best seen on MIP). FT4 and TSH should be measured unless known thyroid disease. The uptake may be very intense in Hashimoto´s thyroiditis. When very intense uptake primary thyroid lymphoma and anaplstic thyroid carcinoma should be ruled out.

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SCC left mandible

Diffuse uptake in the thyroid gland is a typical in chronic thyroiditis.


Diffuse thyroid uptake,		Diffuse thyroid uptake,