Two Cases of Nasopalatine Duct Cyst Treated through Sublabial Approach

Nasopalatine duct cysts (NPDCs) are common developmental epithelial non-odontogenic cyst of the maxillary sinus. The pathophysiologic mechanism of cyst formation is not completely understood. NPDCs develops slightly more frequently in male between the fourth and sixth decades of life. They are commonly asymptomatic. However, when the cyst expands, it can cause various symptoms due to bony erosion and nerve stimulation. With the advancement of sinus endoscopy technique, endoscopic endonasal marsupialization has become a useful method to treat extensive NPDCs. However, complete surgical excision remains the treatment of choice. We present two cases of huge NPDCs successfully treated through a sublabial approach, along with a review of the literatures.