A case of an unusually large expansile nasopalatine duct cyst (NPDC) causing extensive destruction of the hard palate with involvement of the nasal cavity, perforation of the alveolar process and mucosa of the maxilla by pressure of the maxillary anterior teeth is being presented.
Keywords: Alveolar destruction; Developmental cyst; Mucosal perforation; Nasopalatine duct cyst; Non odontogenic cyst.