Growth Analysis of Untreated Meningiomas under Observation

Area of Science:

• Neurosurgery
• Oncology
• Radiology

Background:

• The management of small or asymptomatic meningiomas involves balancing observation against treatment risks.
• Characterizing untreated meningioma growth is crucial for informed clinical decisions.

Purpose of the Study:

• To analyze the growth patterns of meningiomas managed non-surgically.
• To provide data supporting conservative management decisions for meningiomas.

Main Methods:

• Retrospective analysis of 215 magnetic resonance imaging (MRI) scans from 43 patients diagnosed between 2005 and 2015.
• Tumor volumes were calculated using the ABC/2 method; growth patterns were assessed using regression modeling.
• Patients included had at least 1.5 years of follow-up and three MRI scans.

Main Results:

• Of 43 meningiomas evaluated, 28% exhibited significant growth over time.
• Initial tumor volumes varied widely, with a median of 1.52 mL.
• Linear regression models accurately predicted future tumor size based on initial data.

Conclusions:

• Approximately 75% of meningiomas managed conservatively do not demonstrate significant growth.
• The growth of the remaining 25% can be effectively modeled using linear regression.
• Findings aid in refining the observation strategy for meningiomas.