An Unusually Large Parakeratinised Odontogenic Keratocyst in the Maxilla With Extension Into the Floor of the Maxillary Sinus.

Parakeratinised odontogenic keratocyst is a developmental odontogenic cyst affecting the jaw with aggressive behaviour, rapid growth, extension into adjacent structures, and a high recurrence rate of 4.4% in either jaw. This cyst usually occurs in the molar-ramus region of the mandible. If it occurs in the maxilla, the cyst can traverse through the trabecular bone marrow spaces resulting in expansion more mediolaterally than in the buccolingual direction. Here, we present you a case of peripherally occurring parakeratinised variant of odontogenic keratocyst in a 20-year-old-male in relation to impacted left maxillary cuspid in the maxilla with involvement of the floor of the maxillary sinus, imaged by cone-beam computed tomography systems (CBCT) and treated by surgical enucleation.