A 15 yo girl with painless long standing mild right side neck swelling in the region of thyroid, swelling is non tender, does not move with protrusion of tongue.
MRI Axial sections of neck:
Volume of both the lobes of thyroid is equal, signals are identical and normal.
Asymmetry in their shape of thyroid lobes due to right side ICA immediately posterior to right lobe causing mild anterior displacement of right lobe.
Caliber of right ICA is normal, just the course is abnormal.
Conclusion: ICA being immediately posterior to the otherwise normal thyroid giving rise to thyroid swelling clinically.