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Related Experiment Videos

Gamma Knife radiosurgery for functioning pituitary adenomas.

S H Kim1, R Huh, J W Chang

  • 1Department of Neurosurgery, Brain Research Institute, Yonsei University College of Medicine, Seoul, Korea.

Stereotactic and Functional Neurosurgery
|February 22, 2000
PubMed
Summary

Stereotactic radiosurgery can normalize hormone levels in pituitary adenomas, with higher doses and broader tumor coverage leading to faster results. This treatment offers a hormonal response in most patients, though normalization takes longer than surgery.

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Area of Science:

  • Neurosurgery
  • Endocrinology
  • Radiation Oncology

Background:

  • Stereotactic radiosurgery (SRS) is a key treatment for pituitary adenomas.
  • SRS has a delayed hormonal effect compared to microsurgical resection for functioning pituitary adenomas.

Purpose of the Study:

  • To evaluate the efficacy of SRS in achieving hormonal normalization and response in functioning pituitary adenomas.
  • To identify factors influencing the latency period to hormonal normalization after SRS.

Main Methods:

  • Analysis of 37 patients with functioning pituitary adenomas (prolactinomas, acromegaly, Cushing's disease) treated with SRS.
  • Hormonal follow-up included serum prolactin, growth hormone, and 24-hour urine free cortisol.
  • Correlation analysis of maximum dose, tumor volume, and latency to hormonal normalization.

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Main Results:

  • 35.1% achieved hormonal normalization, with a mean latency of 22 months.
  • 81.8% showed a hormonal response (hormone levels <50% of preoperative), with a mean latency of 7.6 months.
  • Higher maximum SRS dose and larger tumor volume within the prescription isodose correlated with shorter latency.

Conclusions:

  • SRS can effectively treat functioning pituitary adenomas, offering both hormonal response and normalization.
  • Optimizing SRS parameters, specifically high maximum doses (≥55 Gy) and broad tumor coverage, may expedite hormonal normalization.