Der Fall eines zementoossifizierenden Fibroms der NasennebenhÖhlen mit Ausdehnung in die vordere SchÄdelbasis unter Mitbeteiligung der Dura wird vorgestellt. Es handelt sich um einen benignen und nach wie vor hinsichtlich Herkunft und histopathologischer Zuordnung umstrittenen Tumor. Die klinische Differentialdiagnose beinhaltet entzÜndliche, neoplastische und fibroossÄre LÄsionen. Auf die Bedeutung des extrakraniellen psammomatÖsen Meningioms bei der Diagnosestellung des zementoossifizierenden Fibroms wird eingegangen. Problematik und Kriterien der histopathologischen Beurteilung des zementoossifizierenden Fibroms werden aufgezeigt. Die ausgeprÄgte Rezidivneigung dieses Tumors erfordert ein radikales chirurgisches Vorgehen. Eine engmaschige postoperative Betreuung des Patienten ist zur FrÜherkennung eines Rezidivs unerlÄsslich.

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