History; odontogenic keratocyst (primordial cyst); gingival cyst and midpalatal Raph e cyst of infants; gingival cyst of adults, lateral periodontal cyst, botryoid odontogenic cyst and glandular (sialo-) odontogenic cyst; dentigerous (follicular) cyst; eruption cyst; calcifying odontogenic cyst; nasopalatine duct (incisive canal) cyst; the so-caled median palatine, median alveolar, median mandibular and globulomaxillary cysts; nasolabial (nasoalveolar) cyst; radicular cyst, residual cyst, paradental cyst and mandibular infected buccal cyst; simple bone cyst (traumatic, solitary, haemorrhagic bone cyst); aneurysmal bone cyst; cysts associated with the maxillary antrum, benign mucosal cyst of the maxillary antrum, post-operative maxillary cyst (surgical ciliated cyst of the maxila); developmental cysts of the of the soft tissues of the mouth, face and neck, dermoid and epidermoid cysts, lympho-epithelial (branchial cleft) cyst; thyroglossal duct cyst, anterior median lingual cyst (intralingual cyst of the foregut origin), oral cysts with gastric or intestinal epithelium (oral alimentary tract cyst); cystic hygroma, nasopharyngeal cysts, thymic cyst; cysts of the salivary glands, mucoceles (mucous extravasation cyst, mucous retention cyst); ranula, polycistic (dysgenetic) disease of the parotid glands; parasitic cysts, hydatid cyst, cysticercus cellulosae, trichinosis; treatment of cysts - contributed by Gordon R. Steward.