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[Keratocysts of the maxilla and zygoma. Case report and review of the literature].

Keratocysts are a special entity of jaw cysts. The horizontal and distal regions of the mandible and the ascending ramus of the mandible are the most common locations of these cysts. Keratocysts of the os zygomaticum and orbital floor are extremely rare. In case of infection radiologic and histologic diagnosis are difficult and these cysts are often misdiagnosed as radicular and follicular cysts. The case of a 49-year old man is reported, who was admitted to hospital suffering from recurrent episodes of maxillary sinusitis with orbital involvement. He had previous sinus surgery six times. The clinical, histologic and radiologic characteristics are reported. In a literature review the present case is discussed. Because the recurrent-rate of keratocysts is rather high, complete removal and careful post-operative follow-up are mandatory.