Follicular Thyroid Carcinoma Metastatic to the Kidney: Report of a Case with Cytohistologic Correlation

Figure 3

The left radical nephrectomy specimen was bisected to reveal a pink-tan, well-circumscribed mass in the inferior pole (bar, 5 cm) (a). Histologic sections of the resection specimen showed follicles filled with colloid and lined by thyroid follicular cells, separated from the adjacent renal parenchyma by a fibrous capsule (H&E, 40x) (b). Higher magnification revealed monomorphic cells with bland nuclei, similar to those in the biopsy specimen, with none of the nuclear features associated with PTC (H&E, 400x) (inset).

(a)

(b)