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Endoscopic Endonasal Trans-sphenoidal Approach: Minimally Invasive Surgery for Pituitary Adenomas
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Predictors for visual dysfunction in nonfunctioning pituitary adenomas - implications for neurosurgical management.

Kathrin Schmalisch1, Monika Milian, Thilo Schimitzek

  • 1Department of Neurosurgery, University of Tuebingen, Tuebingen, Germany. kathrin.schmalisch@med.uni-tuebingen.de

Clinical Endocrinology
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PubMed
Summary

Objective data on visual compromise risk in nonfunctioning pituitary adenomas are limited. Suprasellar extension measurements provide specific cut-off values to predict visual disturbances, aiding clinical decisions.

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Area of Science:

  • Neurosurgery
  • Ophthalmology
  • Radiology

Background:

  • Nonfunctioning pituitary adenomas (NFAs) are common tumors, yet objective data on visual compromise risk based on suprasellar extension are sparse.
  • Surgical management of NFAs is well-established, but predicting visual outcomes requires further clarification.

Purpose of the Study:

  • To establish objective criteria for predicting visual compromise in patients with NFAs.
  • To correlate suprasellar extension measurements with visual dysfunction and visual field defects (VFD).

Main Methods:

  • Magnetic resonance imaging (MRI) was used to measure suprasellar extension in 98 NFAs.
  • The position of the optic chiasm relative to the adenoma was assessed.
  • Findings were correlated with visual acuity and VFD severity.

Main Results:

  • Seventy percent of patients experienced VFD, primarily temporal hemianopsia.
  • Coronal MRI: 12 mm suprasellar extension predicted visual disturbances (87% sensitivity).
  • Sagittal MRI: 8 mm suprasellar extension predicted chiasm syndrome (87% sensitivity).
  • Visual acuity decline strongly correlated with suprasellar extension (P < 0.0001).
  • An anterior optic chiasm position was associated with delayed visual dysfunction in some cases.

Conclusions:

  • Defined MRI cut-off values for suprasellar extension offer high sensitivity and specificity for predicting visual disturbances.
  • These measurements are valuable tools for clinical decision-making in NFA management.
  • Anterior optic chiasm positioning may influence the onset of visual symptoms.