Pituitary adenomas with parasellar invasion

Area of Science:

• Neurosurgery
• Radiology
• Endocrinology

Background:

• Pituitary adenomas can invade the parasellar space, specifically the cavernous sinus.
• Accurate delineation of tumor invasion is crucial for surgical planning and prognosis.

Purpose of the Study:

• To correlate magnetic resonance imaging (MRI) findings with surgical observations in pituitary adenomas invading the cavernous sinus.
• To assess the growth rate of invasive pituitary adenomas.

Main Methods:

• Retrospective analysis of 25 pituitary adenomas with surgically confirmed cavernous sinus invasion.
• Correlation of unenhanced and enhanced MRI scans with surgical findings.
• Measurement of tumor growth rate using the KI-67 monoclonal antibody.

Main Results:

• MRI effectively demonstrates pituitary adenomas extending into the cavernous sinus.
• Adenoma encasement or lateral extension to the intracavernous internal carotid artery indicates invasion.
• Pituitary adenomas invading the cavernous sinus exhibit a significantly higher growth rate (p < 0.001).

Conclusions:

• MRI is essential for evaluating pituitary adenoma invasion into the cavernous sinus.
• Cavernous sinus invasion is associated with higher tumor proliferation and reduced likelihood of surgical cure.