PMC9479528_01
T1- (a) and T2-weighted (b) magnetic resonance (MR) images showing a left posterior fossa meningioma (1.6 cm x 1.6 cm x 1.7 cm). Gadolinium-enhanced axial (c), coronal (d), and sagittal (e) images showing a well-enhanced mass. The dural tail sign is seen in the sagittal image (arrow).
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F1
The tumor appeared as an isointense mass on T1-weighted imaging (WI) and slightly hyperintense on T2WI with enhancement after gadolinium administration [Figure 1].
T2-weighted MR images taken 4 years (a), 8 years (b), and 12 years (c) after the initial diagnosis, showing gradual regression from 1.4 cm x 1.3 cm x 1.0 cm to 1.1 cm x 1.0 cm x 0.9 cm.
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F2
No size changes were observed for 2 years after the initial diagnosis, but gradual regression was seen from the 3rd year [Figure 2]. Twelve years after diagnosis, the most recent MR imaging showed that the tumor had further regressed to 1.1 cm x 1.0 cm x 0.9 cm, and the tumor volume decreased from 2.3 cm3 to 0.5 cm3 (about a quarter of the original size) [Figures 2 and 3].
Changes in tumor size measured from serial magnetic resonance imaging.
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F3
Twelve years after diagnosis, the most recent MR imaging showed that the tumor had further regressed to 1.1 cm x 1.0 cm x 0.9 cm, and the tumor volume decreased from 2.3 cm3 to 0.5 cm3 (about a quarter of the original size) [Figures 2 and 3].