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Six hundred cases of cleidocranial dysostosis have been reported since the disorder was first described in 1898. This is the first case reported with cystic involvement.

Radiology plays an important role in preoperative diagnosis and postoperative assessment of ameloblastoma. The postoperative appearances, including complications as well as radiologic features of recurrence, are discussed. The differential diagnosis of the unilocular lesion is difficult, and particularly noteworthy are the five cases of histologically proven adamantinoma whose radiographic appearance closely mimicked dentigerous cyst.

Follicular cysts associated with impacted teeth in adults usually increase in size or remain static. A case is presented in which a typical dentigerous cyst decreased in size without any subjective or objective evidence of spontaneous drainage.

Five intraoral presentations of actinomycetes are recorded, in three of which the infection was almost certainly specifically due to the microorganisms. The importance of careful histopathologic examination is underlined, and the failure in some cases to investigate apparently simple infections bacteriologically is highlighted.