_{Cerebellopontine angle masses: MR imaging features with radiologic-pathologic correlation.}

Congress:

ECR 2020

Poster Number:

C-09810

Type:

Educational Exhibit

Keywords:

Venous access, MR, Neuroradiology brain, Neuro, Education and training, Not applicable

Authors:

E. BRUNO¹, G. Lo Meo², G. Caruana¹, F. Bencivinni¹, T. V. Bartolotta¹; ¹Palermo/IT, ²Bagheria/IT

DOI:

10.26044/ecr2020/C-09810

DOI-Link:

https://dx.doi.org/10.26044/ecr2020/C-09810

Fig. 1: Vestibular schwannomas A) T1-w-s: hypo- to isointense round-tubular mass,...

Fig. 2: Meningioma A) T1-w-s:Iso- to hypointense mass B) FIESTA-s:oval non...

Fig. 3: Epidermoid cyst A) and B) T1-w and T2-w-s:iso-intense to cerebrospinal fluid...

Fig. 4: Lypoma A) and C) T1-w and T2-w-s:Hyperintense irragulating mass B) fat...

Learning objectives

To describe MR imaging features of the principal cerebellopontine angle (CPA) masses. To illustrate the differential diagnosis according to radiologic-pathologic correlation.

Background

The cerebellopontine angle cistern is a triangular cerebrospinal fluid (CSF)-filled subarachnoid space bound by the pons, cerebellum and petrous temporale bone. CPA masses represent 5-10% of all intracranial masses [1]; they are usually benign and divided into extra-axial and intra-axial tumors. The principal subtypes are extra-axial tumors, like vestibular schwannomas (70-80%), meningiomas (5-12%) and epidermoid cysts (2-6%) [1] . The other extra-axial lesions include arachnoid cysts, lipoma, aneurysm, etc. Intra-axial tumors of CPAs are medulloblastoma, ependymoma and metastasis. Clinical presentation of the CPA tumors is...

Findings and procedure details

Vestibular schwannomas Vestibular schwannoma is a benign encapsulated tumor that arise from the Schwann cells of the nerve sheaths of cranial and spinal nerves.[5]. The majority (95%) of solitary lesions are sporadic. Bilateral vestibular schwannomas are highly suggestive of neurofibromatosis type 2 (NF2), a neurocutaneous disorder associated with a mutation of chromosome 22 [6]. Symptoms The typical presentation is sensorineural unilateral hearing loss or non-pulsatile tinnitus. However, the symptom of vestibular schwannomas depends upon the size and location of the tumor: in the intracanalicular stage...

Conclusion

Lots of CPA pathologies present similar clinical symptoms, like vertigo or tinnitus, however, sometimes it is incidental findings. Because each of theme leads to a different therapeutical pathway, a very good knowledge of the radiological anatomy and a specific MR patterns can help the radiologist to make the right diagnosis.

Personal information and conflict of interest

E. Bruno; Palermo / IT - niente da rivelare G. Lo Meo; Bagheria / IT - niente da rivelare G. Caruana; Palermo / IT - niente da rivelare F. Bencivinni; Palermo / IT - niente da rivelare alla TV Bartolotta; Palermo / IT - niente da rivelare

References

1-Moffat DA, Ballagh RH. Rare tumours of the CPA. Clin Oncol 1995;7:28-41 4- Pratiksha Yadav, Mansi Jantre, Dhaval Thakkar. Magnetic resonance imaging of CPA lesions 5- Woodruff JM, Kourea HP, Louis DN. Tumors of cranial and peripheral nerves. Pathology and Genetics of Tumors of the Nervous System. Lyon: International Agency for Research on Cancer; 2000; 163-74. 6-Morantz RA, Walsh JW. Brain tumors, a comprehensive text. Informa HealthCare. (1994) 7- Smirniotopoulos JG, Yue NC, Rushing EJ.CPA masses: Radiologic-pathologic correlation. Radiographics 1993;13:1131-47. 8- I. Świeszewska, E. Szurowska,...