PMC5894311_01
Clinical photograph of patient showing midline neck swelling below hyoid and above the level of normal thyroid gland
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F1
A 9-year-old girl presented to our service with a midline neck swelling in the infrahyoid location for 3 years [Figure 1].
Transverse USG neck image showing echogenic ectopic thyroid with internal vascularity anterior to larynx
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F2
A well-defined homogeneous tissue with internal vascularity was seen anterior to thyroid cartilage in midline corresponding to clinically palpable neck swelling [Figure 2], suggesting the possibility of undescended remnant thyroid tissue.
Axial CT neck image showing normally located left lobe of thyroid (arrow) with non-visualisation of isthmus and right lobe
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F3
On contrast study, there was marked homogeneous enhancement in ectopic tissues while the normally located left thyroid lobe was relatively less enhancing [Figures 3 and 4].
Sagittal CT neck image showing two enhancing ectopic thyroid tissue in prehyoid (arrowhead) and infrahyoid (arrow) locations in midline neck
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F4
On contrast study, there was marked homogeneous enhancement in ectopic tissues while the normally located left thyroid lobe was relatively less enhancing [Figures 3 and 4].
99m Tc pertechnetate thyroid scan shows two focal areas of radiotracer uptake in midline neck with no evidence of uptake in normal thyroid bed
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F5
Tc pertechnetate thyroid nuclear scan [Figure 5] revealed the functioning two ectopic thyroid tissues corresponding to their locations on the CT scan. There was no uptake in normal location of thyroid gland which confirmed that the left thyroid lobe was nonfunctioning.