OBJECTIVE: Little information about the natural history of incidental @entity1653 exists in the literature. The aim of this study was to determine the natural history of asymptomatic @entity1653 by comparing different methods of growth rate calculation to establish a strategy for dealing with these @entity5 . METHODS: In 47 asymptomatic @entity1 , hospital charts, follow-up records, and imaging studies were reviewed. Of these @entity1 , 6 underwent surgery. @entity5 growth rates were determined by calculating the absolute and relative growth rates and the @entity5 volume doubling times. RESULTS: In 41 @entity1 with conservative management, the average @entity5 size was 9 cm(3), and the majority (66%) of growth rates were less than 1 cm(3)/yr. The absolute growth rate ranged from 0.03 to 2.62 cm(3)/yr (mean, 0.796 cm(3)/yr). Relative annual growth rates ranged from 0.48 to 72.8% (mean, 14.6%). The @entity5 doubling time ranged from 1.27 to 143.5 years (mean, 21.6 yr). A moderate correlation between the age and growth rates was found. In young @entity1 , annual growth rates tended to be higher and @entity5 doubling times shorter. There was no clear correlation between the initial @entity5 size and @entity5 doubling time. The mean annual growth rate of @entity1653 with @entity730 was lower than in @entity5 without @entity730 . Also, @entity5 with hypointense or isointense T2 signals on magnetic resonance imaging had a lower growth rate. In the group of six @entity1 with surgical excision, @entity5 growth rates were higher and @entity5 doubling times shorter than in the nonsurgical group. CONCLUSION: The majority of incidental @entity1653 show minimal growth; thus, they may be observed without surgical intervention unless specific symptoms appear. @entity5 growth is associated with @entity1 age. The initial @entity5 size is not considered a predictive factor for @entity5 growth. Radiological features, such as @entity730 or T2 signal intensity, may provide useful information to predict the growth potential of @entity1653 .

The natural history of incidental XXXX .

@entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'Tumor', 'tumors'] @entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity1653 :: ('MESH:D008579', 'Disease') :: ['meningiomas'] @entity730 :: ('MESH:D002114', 'Disease') :: ['calcification']
@entity1653 :: (MESH:D008579,Disease) :: ['meningiomas']
