Imaging of the Cerebellopontine Angle

Magnetic Resonance Image Manifestations of the Atypical Meningioma

“…2) Tumor boundary is irregular, and lobules are visible, suggesting the presence of certain malignant degree, in this group, 5 cases of tumor show irregular margin and lobules. 3) Peritumoral edema is common, 13 cases of this group have peritumoral edema, and studies have shown that the peritumoral edema was proportional to some extent with the malignant degree of the tumor (Lakshmi and Glastonbury, 2009), but also some researches run counter to it (Smith et al, 1981;Pharham et al, 1994), as the sample size of our study is limited, therefore, the relationship between the peritumoral edema and latent malignant degree need to be further discussed. 4) Tumor diffusion is restricted, a large number of studies show that, DWI as the only noninvasive method of response in vivo tissue in vivo diffusion (Hsu et al, 2010), makes the application and study of MRI more and more widely in various parts of the body, DWI shows high signal in a certain degree of atypical meningioma or malignant meningiomas (Filippi et al, 2001), but there is a clear link between the DWI signal level and cell density, so the exact relation between the two has not been systemic reported, which will be subject to further study and summary.…”

Clinical and surgical considerations for cerebellopontine angle meningiomas

“…[1][2][3][4] The two tumor types have distinct prognostic and treatment considerations with respect to hearing preservation and morbidity associated with various interventions. Radiographic evidence of internal auditory canal (IAC) involvement by tumor and unilateral hearing loss has traditionally been considered suggestive of VS. [5][6][7] Previous reports of IAC invasion rates by CPA meningiomas have been 10% to 17%, [8][9][10] and invasion has generally been considered rare. 11 Reported outcomes for surgical resection of meningiomas located in this region have been variable, and likely reflect both the surgical techniques employed, the individual characteristics of the tumor, as well as its local anatomic characteristics.…”

Cerebellopontine angle meningioma presenting with hearing loss

“…Nerve lesions that may occur in the CPA include schwannomas of the various nerves in the region; they may often be distinguished by their anatomic location ( 1 , 2 , 3 ). VS is typically an ice-cream-cone-shaped mass along the vestibular nerve (VIII) spilling out of the internal auditory canal.…”

“…Meningeal lesions that may occur in the CPA region include metastasis, melanoma, sarcoidosis, tuberculosis, and meningiomas ( 1 , 2 , 3 ). Metastases are typically multiple, and sometimes there is a known primary malignancy.…”