ÖGMKG - und Gesichtschirurgie

Mühlberger, Gabriele
Diskussion:
Bedingt durch die dünne kortikale Dicke im Bereich der maximal möglichen Pixelauflösung
erscheinen die kortikalen Werte durch den „partial volume effect“ gegenüber bekannten
kortikalen Dichten (1000 – 1200mg/ccm) deutlich reduziert, obwohl bei diesen arthrotischen
Gelenken auch subchondrale Sklerosierungen zum Tragen kamen. So kann hier nur von einer
apparenten Dichte gesprochen werden. Entsprechend sind quantitative Aussagen zur Kortika-
lisdicke nicht möglich.
Die Untersuchung zeigt, daß im hochauflösenden Multidetektor-CT im Niedrigdosis-Modus bei
Verwendung eines Kalibrierphantoms und einer geeigneten Auswerte-Software die quanti-
tative Analyse der Veränderungen im trabekulären und kortikalen Anteil des Kieferköpfchens
gut möglich ist. Für eine Einführung in die klinische Routine sind weitere Validierungsstudien
geplant.
Bouckaert, Mike
Odontogenic tumours: A study of 741 cases in Africa (Se08-06)
Mike Bouckaert*, EJ Raubenheimer**, CEE Noffke***, MMJ Mamabolo* (hymnebouckaert@
hotmail.com)
*Medical University of Southern Africa, Dept. of Oral and Maxillofacial Surgery **Medical
University of Southern Africa, Dept. of Oral Pathology ***Medical University of Southern Africa,
Dept. of Radiology
This study was untertaken to determine the relative frequencies of odontogenic tumours as
classified according to the WHO Classification 2005. The tumours presented in a rural and peri-
urban patient population sample treated at the Medunsa Oral Health Centre between 1980 and
June 2006. In an archive of 21.410 surgical biopsies, a total of 741 odontogenic tumours were
diagnosed. Ameloblastomas were most frequently encountered (n= 324, 43.7%) followed by
keratocystic odontogenic tumour (n=170, 22.9%), odontogenic yxoma (n=52, 7%), odontoma
(n=37, 4.9%), adenomatoid odontogenic tumour (n= 33, 44.4%), odontogenic fibroma (n=29,
3.9%), odontogenic malignancies (n=24, 3.2%), calcifying cystic odontogenic tumour (n=21,
2.8%), cementoblastoma (n=16, 2.1%), calcifying epihelial odontogenic tumour (n=11, 1.5%),
ameloblastic fibroma (n=10, 1.3%), and ameloblastic fibroodontoma (n=9, 1.2%). Other tumour
types accountered for less than 1% of the sample. Ameloblastomas affected both genders
equally, keratocystic odontogenic tumours occured significantly more in males and the majority
of adenomatoid odontogenic tumours presented in young females. Of the odontogenic malig-
nancies, 23 were carcinomas and only one a carcinosarcoma.
Two keratocystic odontogenic tumours showed malignant change and a further 3 epithelial
dysplasia. Although this is the first study of this kind to be based on the 2005 WHO Classifica-
tion, our study differs from others in the relative high frequency rates of ameloblastomas and
odontogenic malignancies and the paucity of odontomas.
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