Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The brain metastatic PTC. A. Hematoxylin-eosin staining reveals papillary architectures covered by cuboidal to columnar epithelium. Cellular crowding is visible and neoplastic cells demonstrate nuclear clearing and nuclear grooves. B. TTF-1 staining as a marker for thyroid or lung origin exhibits strong nuclear staining. C. Thyroglobulin shows strong cytoplasmic staining. D. Proliferation marker Ki67 is positive in 20% of cells (original magnification, x400).
