Figure 2From: Methylene blue as an early diagnostic marker for oral precancer and cancerPresentation 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×).Back to article page