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Öğe Epipteric bones in the pterion may be a surgical pitfall(Georg Thieme Verlag Kg, 2003) Ersoy, M.; Evliyaoglu, C.; Bozkurt, M.C.; Konuşkan, B.; Tekdemir, I.; Keskil, I.S.Background: The pterion, the most commonly used neurosurgical landmark, is defined as the junction of frontal, parietal, and greater wing of the sphenoid and the squamous part of temporal bones. Our aim was to identify the variations of the pterion which may be a potential surgical pitfall. Methods: Both sides of 300 adult skulls were examined but 110 sides were eliminated since their pterion could not be identified owing to a damage. The shortest distance between the lateral orbital rim and the most anterior junction of the four bones forming the pterion was measured on all sides. Results: Out of 490 sides the pterion was found to contain epipteric bones in 44 (9%), and in these skulls the most anterior junction of the bones may be as close as 16 mm to the lateral orbital rim. Conclusion: In skulls with an epipteric bone variation, particularly the anterius and proprium types; the pterion can mistakenly be assessed to be at the most anterior junction of bones and a burr hole placed over there may cause inadvertent penetration into the orbit.Öğe Nocardia farcinica brain abscess: a case report and review of the literature(Sociedad Luso-Espanola Neurocirugia, 2004) Sabuncuoglu, H.; Açikgöz, Z.C.; Caydere, M.; Ustun, H.; Keskil, I.S.Nocardia infection is not rare as generally been assumed and its mortality rate is high. It is isolated from plants and soil in most regions of the worid. The hosts usually have predisposing conditions and the infection is acquired through the respiratory tract or skin. Nocardial organisms have a tendency to disseminate hematogenously from the primary site of infection to brain, kidney, joints, bones and eyes. Sulfonamides are preferred empirically for the treatment. Because of high relapse rates, the treatment must be continued for 12 months. In nocardia farcinica infection, the characteristic resistance pattern to cephalosporines must be kept in mind. In this article, a rare case of nocardia farcinica infection with a solitary cerebral abscess is presented and the literature is reviewed.Öğe Percussion chisel(Georg Thieme Verlag Kg, 2003) Keskil, I.S.A new percussion chisel exclusively designed for neurosurgical use is presented that can be applied easily and safely. It is particularly useful in the removal of bony membranes through a transsphenoidal approach.
