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.
Presentation of a true-positive staining on the floor of the mouth. (A) The lesion presented clinically as a huge growth on the floor of the mouth with indurated margins. (B) Vital staining with methylene blue showed deep and focal staining of the lesion. (C) The final pathology revealed a moderately differentiated squamous cell carcinoma. (H &E, 40×).
