Late recurrence of papillary thyroid cancer from needle tract implantation after core needle biopsy: A case report

Figure 1 Radiologic images of initial diagnosis of papillary thyroid cancer. A: Tumor located in right middle lobe of the thyroid; B: Postprocedural hematoma after core needle biopsy through isthmus observed by ultrasonography; C: Presents computed tomography of enlarged lymph node at level IV, performed after excisional biopsy of skin tumor.

Figure 2 Macroscopic finding and microscopic images of recurrent papillary thyroid carcinoma in soft tissue. A: Shows a round light yellow to brown solid soft mass showing focal hemorrhage without necrosis in the superficial subcutaneous layer, measuring 1.4 cm × 1.0 cm; B: Shows a relatively well defined round solid mass in subcutaneous layer in low power field examination. No lymph nodal tissue or residual thyroid tissue was found in the submitted specimen [hematoxylin-eosin (H&E), × 12.5]; C: The mass shows multiple papillary architecture showing nuclear enlargement, nuclear groove and inclusion which is shown in typical papillary thyroid carcinoma (H&E, × 100); D and E: Neither lymphovascular nor perineural invasion was observed in tumor (D2-40, × 100 and CD34, × 100, respectively).