PMC10246396_01
T2-weighted images showing gradual tumor shrinkage. (a) The solid and nodular tumor on the left cerebellopontine angle cistern expanded the internal auditory canal. (b) Tumor shrinkage was seen at 1-year follow-up. (c) Peritumoral cerebrospinal fluid was observed at 2-year follow-up. (d) The solid tumor involuted at 3-year follow-up.
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F1
Re-evaluation of her brain MRI conducted in the previous year revealed a lesion in the left internal meatus with a maximum intracranial diameter (ICD) of 13.5 mm [Figure 1a]. The patient's first follow-up MRI performed at 1 year after the initial MRI showed that the tumor's maximum ICD was 10.8 mm [Figure 1b]. MRI at the 2-year follow-up revealed that the tumor's maximum ICD had decreased to 9.7 mm [Figure 1c]. The most recent MRI investigation at the 3-year follow-up demonstrated further natural shrinkage, with a maximum ICD of 8.4 mm [Figure 1d].
Tumor size and volume versus follow-up time. Both tumor size and volume decreased linearly over 3 years. The solid line with circles indicates tumor size, and the dashed line with triangles represents tumor volume.
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F2
Both tumor size and volume have been decreasing over 3 years [Figure 2].
Audiogram showing an improvement in hearing loss. (a) A pure tone audiogram showed moderate hearing loss on the left side. (b) The left-sided hearing impairment was improved at 2-year follow-up. The red line shows the result for the right ear and the blue line shows the result for the left ear.
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F3
The patient's audiogram at 2 years after the initial PTA revealed an improvement in hearing on the left side from 50 dB to 25 dB [Figures 3a and b].