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AJNR - American Journal of Neuroradiology

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CT and MR Imaging Findings Associated with Subacute Thyroiditis

Kartik Jhaveri^a, Manu M. Shroff^a, Girish M. Fatterpekar^b and Peter M. Som^b

^a Departments of Radiology, P.D. Hinduja National Hospital, Mumbai, India
^b Mount Sinai Medical Center, New York, NY

View larger version (115K): [in a new window]   FIG 1. Patient 1. Iodine-131 radionuclide scan shows virtually no uptake of radioactive iodine by the thyroid gland.

View larger version (108K): [in a new window]   FIG 2. Patient 1. Unenhanced axial CT scan shows diffuse decrease in the attenuation of the thyroid gland (black arrow), which is isoattenuated to the muscle. White arrow indicates the sternocleidomastoid muscle.

View larger version (102K): [in a new window]   FIG 3. Patient 1. Contrast-enhanced axial CT scan shows slight enlargement of the left thyroid lobe. Decreased attenuation can be seen in the posterior portion of the left thyroid lobe (curved arrow), and slightly decreased attenuation can be seen anteriorly in the right thyroid lobe (straight arrow).

View larger version (135K): [in a new window]   FIG 4. Patient 1. Axial MR images of the neck. A, T1-weighted image shows mild hyperintensity in the thyroid gland. B, T2-weighted image shows a more pronounced hyperintensity, compared with muscle, in the thyroid gland.

View larger version (105K): [in a new window]   FIG 5. Patient 2. CT scan shows thyroid gland to have diffusely decreased attenuation.

View larger version (118K): [in a new window]   FIG 6. Contrast-enhanced CT scan shows enlarged right thyroid lobe with decreased attenuation (arrow).