Nakamasa Hayashi

Toyama Medical and Pharmaceutical University, Тояма, Toyama, Japan

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Publications (2)5.12 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Skull base chondrosarcomas are rare tumors and individual experience with their management is limited. We present a series of such tumors treated at our institution. Particular attention was paid to their extension pattern, choice of surgical approach, and outcome. Twenty-five patients were operated consecutively over a period of 19 years. Their clinical presentation, radiological features, surgical treatment, early and late treatment outcome, as well as survival rate were analyzed. The most frequent initial symptom was abducent palsy. The typical bone destruction of the petrous apex was found in 83%. Chondrosarcomas extended in 92% to the posterior cranial fossa. Total number of surgeries was 39. The operative approach was tailored to each case. The retrosigmoid approach was used in 30.8%, the pterional in 23%, and the transethmoid in 15.4%. Total tumor removal was achieved in 19 of the surgeries. New neurological deficits immediately after surgery appeared in 33.3%. The perioperative mortality was 0%. The average Karnofsky performance score at last follow-up was 91%, and 5- and 10-year survival rates were 95%. Individually tailored approach in skull base chondrosarcomas allows radical removal with low morbidity rates and without mortality. Given the good long-term prognosis, surgical treatment should not deteriorate significantly patients' quality of life.
    Neurosurgical Review 10/2008; 32(1):67-75; discussion 75. · 1.97 Impact Factor
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    ABSTRACT: The goal of this study was to report on the surgical management of skull base chordomas and to evaluate both the short- and long-term treatment outcomes. The authors retrospectively studied data from 49 patients who had undergone consecutive surgeries at a single institution. They also analyzed patterns of chordoma extension. Complications and surgery-related morbidity were recorded. A Kaplan-Meier analysis was performed to determine survival rates in patients 5 and 10 years after their first surgery. Operative approaches were selected on the basis of the predominant tumor extension. The approach used most frequently was the transethmoidal in 36.3%, followed by the pterional in 23.4% and the retrosigmoid in 23.4%. The tumor was totally removed in 49.4% and subtotally in 50.6%. The rate of total removal was highest at initial surgery (78%) and progressively declined thereafter. In 11.8% of cases a new neurological deficit developed, while the preoperative deficit remained unchanged. In 20% of cases the preoperative deficits improved, but new deficits also appeared. The 5- and 10-year survival rates are 65 and 39%, respectively. With an individually tailored surgical approach, total tumor removal in 78% of the cases was achieved at the initial surgery. Radical surgery appears to increase slightly the surgical morbidity, but at the same time prolongs the recurrence-free interval. Chordomas cannot be regarded as surgically curable tumors given the 5- and 10-year survival rates in patients harboring such lesions.
    Journal of Neurosurgery 09/2007; 107(2):319-24. · 3.15 Impact Factor

Publication Stats

46 Citations
5.12 Total Impact Points

Institutions

  • 2008
    • Toyama Medical and Pharmaceutical University
      Тояма, Toyama, Japan