The article describes the historical and legal basis, as well as the ballistic criteria of injuries caused by air-rifle shots to the head. Six of our own cases of craniocerebral air-gun pellet injuries are discussed and critically assessed, using the results communicated in other papers as the basis of the discussion. The different post-traumatic complications, including the histopathological reaction of the brain to lead-pellets, are considered. The literature is reviewed and the indications for stereotactic removal or craniotomy of intracranial air-gun pellets are discussed. Air rifles, while occasionally the cause of serious head injuries, are rarely thought of as lethal weapons. However, this article illustrates the potential penetrating power of the air-gun pellet, a fact not always appreciated by physicians.
Although meningiomas are of benign character and generally of encapsulated growth, recurrence is a known problem in treatment. The authors present the time course of a recurrent parasagittal meningioma of the falx, which recurred eleven times. Despite modern radiological diagnostic methods, which made early diagnosis of recurrent tumour possible, and the use of modern microsurgical techniques with radical tumour extirpation and followed by radiotherapy, the fatal course of benign tumour disease could not be stopped.
Einleitung Der Begriff Rapid Prototyping (RP) umfaßt sämtliche Methoden des individuellen Prototypenbaus durch rechnergesteuerte Herstellungsverfahren basierend auf Rechnerdaten. Hierzu zählt neben der Herstellung von Fräsmodellen, der ersten Form des Rapid Prototyping, die Stereolithographie und die Laser-Sinterung verschiedener Kunststoffe. Diese Verfahren eröffnen neue Wege in der Planung mund-kiefer-gesichtschirurgischer Eingriffe, wie auch anderer Eingriffe im Kopf-Hals-Bereich. Der Vorteil liegt in der direkten Herstellung komplexer dreidimensionaler anatomischer Strukturen, der besseren Erkennbarkeit kritischer Regionen und der Möglichkeit der zielgerichteten individuellen Operationsplanung zur Verbesserung des Operationsergebnisses. Während die Modellfräsung nur die Darstellung oberflächlicher Strukturen erlaubt, ist mit der Stereolithographie und der Laser-Sinterung auch die Darstellung von Binnenstrukturen möglich (1).
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