King's College London

Background: A proportion of oral squamous cell carcinoma (OSCC) is preceded by oral potentially malignant disorders (OPMD), and the rest might not be associated with any well-established OPMD. Chronic traumatic ulcer (CTU) has been suggested as a lesion with potential for malignant transformation, but the evidence is inconclusive. Objective: The aim of this study was to describe clinicopathological features of non-healing CTU (NHCTU) that later developed to OSCC. Materials and methods: A retrospective cohort study was performed of patients attending the Facultad de Odontología Universidad Nacional de Córdoba (2013–2019). The study included patients with a provisional diagnosis of CTU. CTUs without complete healing after removal of traumatic factors—non healing CTU (NHCTU)—were investigated by biopsy. A detailed description of cases where a malignancy was diagnosed is presented. Results: A total of 107 CTU were included. Of these, 32 CTUs were considered NHCTU and two cases showed histological features of OSCC in the background of NHCTU. In both cases, lesions were found on the lateral tongue. Both were non smoking, non alcohol drinking individuals. Absence of any well-known OPMD was also registered. Conclusions: The possibility of malignant transformation in a subset of tongue NHCTU should not be underestimated. Clinical relevance: In a subgroup of patients, NHCTU could be considered an OPMD. Although the potential malignant transformation rate is low, these conditions should be always followed up.