All are true about nasolabial cysts except

Nasolabial Cysts/Nasoalveolar Cyst/Klestadt&;s Cyst:- * It is a rare non odontogenic cyst which originates from epithelial entrapment in the line of fusion between maxillary and median nasal elevation. * Female >Male * Bilateral in approximately 10 % of all cases. * Usually present in 4th and 5th decades of life. * It lies on the bone and causes an excavation. It is closely attached t o floor of the nose. * It presents as a smooth and soft bulge in the lateral wall and floor of vestibule anterior to inferior turbinate. * Large cyst obliterates the alar facial fold (nasolabial sulcus). Treatment:- It is by surgical excision using sublabial approach. Ref:- Scott Brown 7th/ed; pg num:- 1320