Fig. 1
From: A case of intrathyroid parathyroid tumor that was difficult to diagnose by ultrasonography
Ultrasonographic imaging. a Transverse image. b Longitudinal image. c Color Doppler imaging. The tumor ((a, b) arrow) was located in the inferior pole of the right lobe of the thyroid gland and no parathyroid mass was observed. The size of the tumor was 18 × 13 × 11 mm (anteroposterior × transverse × craniocaudal dimension). The tumor had an irregular round shape and showed heterogeneous hyperechogenicity with a defined margin, but within it, there were a few unclear margins, irregular and hypoechogenic area, and the tumor had a mosaic appearance at first glance. Color Doppler sonography showed that the blood vessels ((c) arrow) flowing into the tumor were thick and marked blood flow was also observed within the tumor