Figure 4. Trends in the incidence of WDTC by adverse pathologic features.
(a) Joinpoint regression of incidence trends in (a) cancers without extrathyroidal extension, (b) cancers with extrathyroidal extension, (c) cancers without cervical metastases (in patients >45 years old), and (d) cancers with cervical metastases (in patients >45 years old).
