Abstract
We report a case of carcinoma of the floor of the mouth coexisting with an extravasation mucous cyst. A 60-year-old man was referred to our hospital because of a painful swelling in the middle of the oral floor. The lesion appeared to be a mucous cyst and measured 29×19mm. The surface was red and eroded. Cytologic examination resulted in a diagnosis of malignant tumor. Surgical extirpation was carried out with the patient under general anesthesia. Histopathological examination revealed moderately differentiated squamous cell carcinoma associated with an extravasation mucous cyst. There has been no evidence of recurrence or metastasis as of 1 year 8 months after surgery. However, long-term follow up is required.
