Abstract
Objective: to approach the diagnosis of a Microinvasive Oral Spino-Cell Carcinoma (CECBM) in a synchronous event with a Pulmonary Adenocarcinoma. Case Report: This is a female patient, 59 years old, who attended the dental service of the Centro Universitário Cesmac, complaining of an ulcerated white-red plaque, with no pain symptomatology that, after anamnesis and complementary examinations, it was possible to diagnose Microinvasive Oral Spino-Cell Carcinoma, as well as during the preliminary examinations of the treatment, the synchronous presence of a pulmonary adenocarcinoma was identified. Final considerations: CECBM lesions should be diagnosed without underestimating the clinical presentation and in addition, the occurrence of the second primary malignant tumor that in this case was diagnosed during the oncological pre-treatment evaluation of the primary lesion of the mouth should be considered.