A Radicular Cyst with Cutaneous Fistula which was Misunderstood as a Nasolabial Cyst

A radicular cyst is an inflammatory, epithelial cyst that occurs in the maxillar bone, especially anterior segment. For optimal treatment, differentiation with other odontogenic cyst is very important. In this report, there was a 71-years-old man who visited our clinic with right naso-alar sulcus swelling and pus-like discharge. We diagnosed as nasolabial cyst based on history, physical examination and PNS CT scan, and designed excision via Caldwell-Luc approach. However, In operation, we found an adhered cyst that induced by 13th canine root infection, and its pathologic findings were chronic inflammation. So, we made definite diagnosis to radicular cyst, and performed additional dental treatment. Radicular cyst is most common in odontogenic cyst. Nevertheless it can be easily misunderstanding to other odontogenic cyst, we present this report with a review of literatures. (J Clinical Otolaryngol 2014;25:211-214)