Merck Manual

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Thyroid, transverse ultrasonography, dog
transverse-ultrasound-thyroid-arrows-dog-ham-sized
Thyroid, transverse ultrasonography, dog

    Transverse ultrasonographic image of the parathyroid nodule; lateral is to the right. The large block blue arrow is pointing towards the trachea. The small white arrow is pointing to the hypoechoic round parathyroid nodule measuring 0.19 cm × 0.22 cm

Courtesy of Dr. Kathleen Ham.