Fig 1.
Flow chart of the patient cohort.
Table 1.
Characteristics of the patients with and without IAC involvement by meningioma of the cerebellopontine angle.
Fig 2.
A 60-year-old male patient with mixed meningioma in the left CPA.
The preoperative axial T2WI (a) shows an isointense mass in the left CPA. Part of the tumor intrudes into the left IAC (black arrow). The preoperative post-contrast axial image (b) shows an enhanced mass with a maximal axial area of 135mm2. The intruding part of the tumor is also enhanced (black arrow). The postoperative axial T2WI (c) shows that the preoperative mass is no longer visible and that the left ICA is essentially uninvolved (black arrow). The postoperative post-contrast axial T1WI (d) shows no enhanced lesion in the CPA and inner opening of the IAC.
Fig 3.
A 43-year-old female patient with mixed meningioma in the left CPA.
The preoperative axial T2WI (a) shows the left IAC filled by a hypertintense mass. The left IAC is not dilated and its signal intensity is similar to that of the tumor (white arrow). The preoperative post-contrast axial image (b) demonstrates a heterogeneously enhanced mass with a maximal axial area of 506mm2. The left IAC is also slightly enhanced (white arrow). The postoperative axial T2WI (c) shows the absence of the preoperative mass in the left CPA but the IAC is still filled by abnormal signal intensity (white arrow). The postoperative post-contrast axial T1WI (d) reveals heterogeneously enhanced IAC (white arrow).
Fig 4.
A 55-year-old male patient with meningothelial meningioma in the right CPA.
The preoperative axial T2WI (a) shows the right IAC filled and enlarged (white arrow) by a hypertintense mass. Peritumoral edema is seen as patchy high signal intensity in the right cerebellar hemisphere and vermis. The preoperative post-contrast axial image (b) shows a heterogeneously enhanced mass with a maximal axial area of 1104mm2. The right IAC is also enhanced (white arrow). The postoperative axial T2WI (c) reveals that the IAC is still filled by abnormal signal intensity (white arrow). The postoperative post-contrast axial T1WI (d) shows heterogeneous enhancement of the enlarged IAC (white arrow).
Table 2.
Characteristics of patients according to IAC involvement subtype.
Table 3.
Influence of clinical, radiological, and pathological factors on IAC involvement.