PMC5811771_01
CT neck. Both lobes of the thyroid are enlarged, slightly more marked on the left, causing mild tracheal narrowing with a reduction in the transverse diameter of the trachea to 13 mm.
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fig1
CT scan (Fig. 1) revealed mild compression of the cervical trachea due to thyroid enlargement. March 2008: CT scan (Fig. 1) revealed mild compression of the cervical trachea due to thyroid enlargement.
T1-weighted MR with contrast. Isointense thyroid gland with reduced enhancement following contrast administration consistent with Riedel's thyroiditis. The degree of tracheal compression has increased with a minimum mediolateral diameter of 11 mm.
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fig2
MRI (Fig. 2) confirmed that the thyroid mass had increased in size with further compromise of the tracheal lumen. MRI (Fig. 2) confirmed that the thyroid mass had increased in size with further compromise of the tracheal lumen.
T1-weighted MR with contrast. T1-weighted image showing enlargement of the homogenous thyroid mass to 6 x 4 cm, associated with tracheal narrowing at the sternal notch (arrow).
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A repeat MRI scan confirmed enlargement of the residual thyroid mass from 4 x 3.3 cm to 6 x 4 cm (Fig. 3). 
T1-weighted MR with contrast. The amount of disease encasing the left carotid sheath has decreased from 21 mm thickness to 15 mm thickness with no significant tracheal compression.
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fig4
MRI shows that the mass encasing the left carotid sheath has decreased from 21 mm to 15 mm thickness (Fig. 4). July 2014: MRI shows that the mass encasing the left carotid sheath has decreased from 21 mm to 15 mm thickness (Fig. 4).