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In 1984, the dissertation 'The incredible keratocyst' was published. A postscriptum of this dissertation introduced a new and simplified approach in the treatment of keratocysts. Keratocysts are disreputable for a high recurrence prevalence and the new method is minimizing the chance of recurrence. The essence of the method is fixation of the cystwall with a modified Carnoy's solution before enucleation. During the past 25 years no new developments have been published concerning surgical treatment of keratocysts, which are essential divergent of this method. However, some authors have objections to the use of the modified Carnoy's solution because of feasible pathologic side effects. Based on research data and experiences of the author, it can be concluded that the fixing agent may be used without any risk.

A six-year-old girl was referred by her dentist because ofa tender swelling of the mandible on both sides. On intra-oral examination afirm swelling on the buccal side of both first permanent lower molars was noticed. Bucally of the teeth 36 and 46 a pocket depth of more than 10 mm was measured. On conventional X-rays no abnormalities were found. Additional CT-scan examination showed a well-described radiolucent lesion bucally of the teeth 36 and 46 compatible with the diagnosis of a bilateral juvenile paradental cyst. The lesions were enucleated without removal of the associated teeth, The terminology ofparadental cysts, as well as epidemiological, clinical, radiological, histopathological, and treatment aspects are further described.

An unilateral maxillary sinusitis is frequently caused by dental pathology. An odontogenic cyst in the maxillary sinus usually lacks accompanying symptoms of infection. In three patients, a 35-year-old man and two women aged 16 and 28, an odontogenic cyst in the maxillary sinus was diagnosed. Consultation of a maxillofacial surgeon is needed because orthopantomographic imaging is diagnostically most helpful. In these patients combined treatment by an ENT surgeon and a maxillofacial surgeon is important.