|Year : 2020 | Volume
| Issue : 2 | Page : 169-172
Cranial Manifestations of Neurofibromatosis Type 2: A Rare Case Demonstrating 15 Intracranial Lesions
Amit Kharat, S Sneha, Ela Sharma, Vishva Chauhan
Department of Radiology and Radiodiagnosis, Dr. D.Y. Patil Medical College, Hospital and Research Centre, Dr. D.Y. Patil Vidyapeeth, Pimpri, Pune, Maharashtra, India
|Date of Submission||02-Nov-2018|
|Date of Decision||05-Oct-2018|
|Date of Acceptance||27-Mar-2019|
|Date of Web Publication||28-Feb-2020|
Department of Radiology, Dr. D.Y. Patil Medical College and Hospital, Pimpri, Pune - 411 018, Maharashtra
Source of Support: None, Conflict of Interest: None
Neurofibromatosis type 2 (NF-2) is a rare autosomal dominant disorder characterized by multiple neoplasms which include meningiomas, schwannomas, and ependymomas. The most common tumors associated with NF-2 are bilateral vestibular schwannomas. We report the case of a 20-year-old female who presented with headaches and decreased vision. She had classical clinical presentation and imaging findings, which led to the diagnosis of NF-2.
Keywords: Autosomal dominant disorder, ependymomas, meningiomas, multiple inherited schwannomas, meningiomas, and ependymomas, neurofibromatosis 2, schwannomas
|How to cite this article:|
Kharat A, Sneha S, Sharma E, Chauhan V. Cranial Manifestations of Neurofibromatosis Type 2: A Rare Case Demonstrating 15 Intracranial Lesions. Med J DY Patil Vidyapeeth 2020;13:169-72
|How to cite this URL:|
Kharat A, Sneha S, Sharma E, Chauhan V. Cranial Manifestations of Neurofibromatosis Type 2: A Rare Case Demonstrating 15 Intracranial Lesions. Med J DY Patil Vidyapeeth [serial online] 2020 [cited 2020 Jul 13];13:169-72. Available from: http://www.mjdrdypv.org/text.asp?2020/13/2/169/279625
| Introduction|| |
Neurofibromatosis (NF) type 2 (NF-2) is a rare autosomal dominant disorder caused by a mutation in a tumor suppressor gene on chromosome 22. The most common presenting symptom is hearing loss related to vestibular schwannomas. Around 10% of patients with bilateral vestibular schwannomas have NF-2.
| Case Report|| |
A 20-year-old female presented with headaches, decreased vision in the right eye, and ptosis of the left eye for 5 months. Ophthalmological examination revealed optic atrophy of the left eye and myopic chorioretinal degeneration of the right eye. Family history was negative. Physical examination revealed no skin lesions. Contrast-enhanced brain magnetic resonance imaging (MRI) was performed which revealed multiple meningiomas and schwannomas.
| Discussion|| |
NF-2/multiple inherited schwannomas, meningiomas, and ependymomas is a rare autosomal dominant neurocutaneous/phakomatosis disorder which is caused by a mutation in a tumor suppressor gene on chromosome 22 encoding protein merlin. The reported incidence on NF-2 is 1:50,000. The most common presenting symptom is hearing loss which results from cranial nerve VIII schwannomas. Other presenting symptoms include tinnitus and imbalance. Headaches and seizures can also result due to the meningiomas.
The diagnosis of NF-2 is mostly made based on the family history of NF-2 or the presence of bilateral cranial nerve VIII masses. The average age at presentation is 20–30 years, with 10% presenting before the age of 10 and 18% presenting before the age of 15.
Cutaneous lesions are rare in NF-2 compared to NF-1. Central nervous system (CNS) lesions of NF-2 include bilateral acoustic schwannomas, meningiomas, and ependymomas. The most common spinal tumors in NF-2 are spinal schwannomas, with the cervicothoracic region being the most common site. Malignant transformation of NF-2 lesions is extremely rare as compared to NF-1; however, it is higher than the general population. More than half of the patients present with no prior family history.
Revised criteria for the diagnosis of NF-2 proposed by Gutmann et al. in 1997 are summarized in [Table 1].
Manchester criteria for diagnosis of NF-2 are summarized in [Table 2].
- Clinical history
- Family history
- Clinical examination including ophthalmic and cutaneous
- MRI brain and spine
- Molecular analysis.
Initial radiological evaluation includes computed tomography or MRI.
- Multiple intracranial meningiomas
- Schwannomatosis/multiple intracranial schwannomas.
Multiple intracranial meningiomas is considered as a diagnosis when two or more meningiomas are diagnosed on imaging studies either simultaneously or sequentially of same or different histological subtypes at different locations. Multiple intracranial meningiomas are usually rare when not associated with NF-2.
Schwannomatosis is considered the diagnosis when multiple cranial/spinal/peripheral nerve schwannomas are present in the absence of vestibular schwannomas. Other tumors associated with NF-2 such as multiple meningiomas, ependymomas, or astrocytomas are also not seen.
The most common phacomatosis disorder is NF-1, with an incidence of 1:2000 live births. Diagnostic criteria for NF1 is summarized in [Table 3].
Tabular format differentiating NF-1 from NF-2 is summarized in [Table 4].
The risk of transmission to the offspring from affected individuals is 50%. Screening for these high-risk patients can be initiated at birth. Screening with MRI should start at 10 years of age in high-risk families. Once tumors are diagnosed on MRI, annual follow-up can be done to evaluate disease progression. If there are no lesions on initial scan, screening can be performed every 2–5 years.
The presented patient has bilateral CN VIII schwannomas [Figure 1], bilateral trigeminal schwannomas [Figure 2], right hypoglossal schwannomas [Figure 3], left optic meningioma [Figure 4], one spinal meningioma [Figure 5], multiple intracranial meningiomas [Figure 6] and en plaque meningiomas [Figure 7]. Our diagnosis was based on radiological findings, given the family history was negative.
|Figure 1: Axial postcontrast magnetic resonance-T1-weighted imaging shows well-defined homogeneously enhancing lesions measuring 17 mm × 9 mm × 15 mm along the left 7th–8th nerve complex extending in the left internal auditory canal (with intra- and extracanalicular components), measuring 13 mm × 5 mm in the right internal auditory canal along the right 7th–8th nerve complex suggestive of vestibular schwannomas|
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|Figure 2: Axial postcontrast T1-weighted imaging shows well-defined homogeneously enhancing lesions measuring 8 mm × 5 mm and 8 mm × 5 mm along the right trigeminal nerve and 8 m × 4 m along the left trigeminal nerve, suggestive of schwannomas|
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|Figure 3: Axial postcontrast T1-weighted imaging shows well-defined homogeneously enhancing lesions measuring approximately 9 mm × 6 mm along the right hypoglossal nerve likely to be schwannoma|
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|Figure 4: Optic nerve sheath meningioma measuring approximately 25 (anteroposterior) mm × 11 (transverse) mm × 10 (craniocaudal) mm is noted along the intraorbital portion of the left optic nerve along its medial, inferior, and lateral aspects up to its intracanalicular portion|
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|Figure 5: Well-defined homogeneously enhancing lesion measuring approximately 16 mm × 14 mm × 12 mm noted in the upper cervical canal on the left side at C1–C2 level|
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|Figure 6: Multiple, well-defined extra-axial lesions are noted appearing hypointense on T1-weighted imaging and hyperintense on T2-weighted imaging, showing homogenous postcontrast enhancement in both supra- and infratentorial regions suggestive of meningiomas|
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|Figure 7: Multiple, well-defined extra-axial lesions are noted appearing hypointense on T1-weighted imaging and hyperintense on T2-weighted imaging, showing homogenous postcontrast enhancement in both supra- and infratentorial regions suggestive of meningiomas|
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| Conclusion|| |
NF-2 is a rare autosomal dominant disorder predominantly involving the CNS due to loss of tumor suppressor function. NF-2 should be in the differential diagnosis of patients with bilateral acoustic schwannomas, even without a positive family history. The presence of bilateral acoustic schwannomas should prompt further investigation for meningiomas, other nerve schwannomas, and ependymomas.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7]
[Table 1], [Table 2], [Table 3], [Table 4]