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Fig. 3


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Combined surgical approach; (a) I window, middle anstrostomy, s nasal septum; (b) II window, antero-inferior wall fenestration, * cyst; (c) cyst enucleation through the II window, * cyst; (d) osteoma removal, § osteoma; (e) double surgical approach, I and II windows; (f) PRGF membrane positioning, i incisive.

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