Fig. 4

A 35-year-old female with a 1.8 cm papillary thyroid carcinoma in the right lobe of the thyroid gland (a, b, c and d) and A 47-year-old female with a 2 cm nodular goiter in the right lobe of the thyroid gland (e, f, g and h). Axial T2-weighted imaging (a) shows a striped low signal area; Axial diffusion-weighted imaging (DWI) (b) and apparent diffusion coefficient (ADC) map (c) show restricted diffusion of the lesion (high signal intensity on DWI, low signal intensity on ADC); The delayed phase contrast-enhanced T1-weighted imaging (d) reveals a greater enhancement in the peripheral area compared to the central area of the lesion, with a blurred border between them, which corresponds to the reversed halo sign in delay phase. The characteristics of the lesion (a, b, c, and d) including age < 48, low signal intensity on T2WI, restricted diffusion, and the presence of the reversed halo sign in delay phase, are consistent with an MRI risk scoring system score of 26 and indicate a determination of malignancy. Axial T2-weighted imaging (e) show a striped low signal area; Axial DWI (f) and ADC map (g) show high signal intensity of lesion; The delayed phase contrast-enhanced T1-weighted imaging (h) shows heterogeneous enhancement of lesion. The characteristics of the lesion (e, f, g and h) including age < 48 and low signal intensity on T2WI, are consistent with an MRI risk scoring system score of 6 and indicate a determination of benignity