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A small candidate parathyroid lesion which is external to thyroid (located inferior to isthmus, superior to brachiocephalic trunk), size 0.9 x 0.9 x 0.9 cm (AP x W x CC), associated with adjacent prominent feeding artery and draining vein, giving rise to "polar vessel" sign. This aforementioned lesion has mean attenuations of 30HU (plain), 100HU (arterial phase), 75HU (portovenous phase) which are consistently less than the attenuation of thyroid gland - type C enhancement pattern.
Asymmetry of thyroid gland in which right hemithyroid is slightly larger than the left. No retrosternal extension.