Fig. 2
From: Opinion: leading position of ultrasound in decision algorithm for small papillary thyroid carcinoma
US scan of two diffuse Sclerosing Variants (DSV) of PTC. Case 1 Longitudinal US scan of right lobe (A), histopathological specimen (B, 20 ×). DSV shows diffuse extensive psammoma bodies (O) of thyroid lobe (A, B), usually without forming a gross tumour nodule. In the present case, a dominant 9 mm Eu-TIRADS4 anterior nodule T1a is displayed (A, ++). Case 2 Longitudinal US scan shows Eu- TIRADS5 posterior thyroid nodule (C); Doppler US discloses twinkling artefacts of psammoma microcalcifications on Doppler US (D). TNM staging: the radiologist takes into account the PTC nodule size, whereas the histopathologist takes into account the nodule size but also the long axis of microcalcifications, which correspond to intra lymphatic intralobar thyroid tumour spread