Abstract
We report the case of a 66-year-old man who had a left forehead mass for 5 years. Positron emission tomography-computed tomography(PET-CT)was performed in 2013 because he had tongue cancer,and it revealed cutaneous accumulation at the left forehead; however,the standardized uptake value(SUV)was low and passage was observed. On PET-CT performed in 2015,an increase in cutaneous accumulation was noted,and therefore,skin biopsy was performed. Pathological findings indicated accumulation in luminal structures of various sizes and a cribriform structure from the dermis to the galea aponeurotica. The luminal structures included basophilic cells,which contained basophilic material. Additionally,neuronal invasion was noted. Therefore,he was diagnosed with primary cutaneous adenoid cystic carcinoma,and surgery was performed. No recurrence has been noted for 5 months following surgery. Adenoid cystic carcinoma often shows neuronal invasion and regional relapse. Therefore,extended resection and a long-term follow-up are needed. Even if the SUV is low,it is important to perform dermatological examinations.
