Figure 1
From: Methylene blue as an early diagnostic marker for oral precancer and cancer
Presentation of a true-positive staining on a red and white homogenous patch on the right buccal mucosa. (A) The lesion presented clinically as a red and white homogenous patch. (B) Vital staining with methylene blue showed deep and focal staining of the lesion. (C) The final pathology revealed a severe dysplasia. (H &E, 40×).