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Related Experiment Videos

Radiosurgery for nonfunctioning pituitary adenomas.

Yoshiyasu Iwai1, Kazuhiro Yamanaka, Katsunobu Yoshioka

  • 1Department of Neurosurgery, Osaka City General Hospital, Osaka, Japan. y-iwai@rc5.so-net.ne.jp

Neurosurgery
|March 29, 2005
PubMed
Summary

Gamma knife radiosurgery effectively controls nonfunctioning pituitary adenomas, showing a 93% 5-year tumor growth control rate with low rates of endocrinopathy and optic neuropathy.

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Area of Science:

  • Neurosurgery
  • Radiation Oncology
  • Endocrinology

Background:

  • Nonfunctioning pituitary adenomas (NFAs) are common intracranial tumors.
  • Treatment options for NFAs include surgery, radiation therapy, and medical management.
  • Gamma knife radiosurgery (GKR) is a precise form of radiation therapy.

Purpose of the Study:

  • To evaluate the efficacy and safety of gamma knife radiosurgery for treating nonfunctioning pituitary adenomas.
  • To assess tumor growth control and complication rates following GKR in patients with NFAs.

Main Methods:

  • Retrospective analysis of 34 patients with NFAs treated with GKR between 1994 and 1999.
  • Patients underwent prior surgical resection.
  • Tumor volume, radiation dose, and optic apparatus dose were recorded. Follow-up ranged from 30 to 108 months.

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Main Results:

  • Tumor size decreased in 58.1% of patients and remained stable in 29.0%.
  • The 5-year tumor growth control rate was 93%.
  • Low rates of radiation-induced endocrinopathy (6.5%) and no new cranial nerve deficits, including optic neuropathy, were observed.

Conclusions:

  • Gamma knife radiosurgery demonstrates a high tumor growth control rate for NFAs.
  • GKR is associated with a low morbidity rate, even in cases involving optic apparatus compression.
  • Long-term follow-up is essential for monitoring late complications.