Плоскоклеточный рак слизистой полости рта, ошибочно диагностированный как третичный гуммозный сифилис

The article describes the causes of false-positive serological tests for syphilis in the blood. The authors present their own clinical observations of an erroneous diagnosis of tertiary syphilis in a patient aged 56 with squamous cell carcinoma of the oral mucosa.