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|LETTER TO EDITOR
|Year : 2012 | Volume
| Issue : 1 | Page : 117-119
Foramen magnum extramedullary cavernous hemangioma in a pediatric patient
Department of Neurosurgery, Manipal Super-specialty Hospital, Vijayawada, Andhra Pradesh, India
|Date of Submission||20-Oct-2011|
|Date of Decision||27-Nov-2011|
|Date of Acceptance||29-Nov-2011|
|Date of Web Publication||7-Mar-2012|
Department of Neurosurgery, Manipal Super-specialty Hospital, Vijayawada, Andhra Pradesh
|How to cite this article:|
Palani A. Foramen magnum extramedullary cavernous hemangioma in a pediatric patient. Neurol India 2012;60:117-9
The reported incidence of central nervous system (CNS) cavernomas ranges from 0.4 to 0.9% and they account for 10-15% of all vascular malformations of the CNS. , Extra-axial cavernomas are rare and to the best of our knowledge, only one case of intradural extramedullary cavernoma at the foramen magnum has been reported.  We are reporting the second such unusual case.
An 11-year-old boy presented with occipital headache, low-grade fever, neck pain and rigidity of two months duration with exaggeration of symptoms a week before presentation. Neurological examination revealed signs of meningism, subtle corticospinal tract signs (motor power 4/5) with bilateral up-going plantars. He was initially treated as sub-acute meningitis by a pediatrician. Cerebrospinal fluid (CSF) was clear with 15 leukocytes/mm 3 (95% lymphocytes), few crenated red blood cells, mildly elevated protein and normal glucose. Computed tomography [Figure 1] showed a 3 × 2.5 cm, predominantly hyperdense mass lesion with areas of isodensity in the right postero-lateral foramen magnum region extending up to the C2 spine level. Magnetic resonance image (MRI) [Figure 2] and [Figure 3] showed a dural-based extramedullary isointense mass lesion with surrounding hyperintensity and mild contrast enhancement. Cerebellar convexity dura on both the sides and anterior spinal dura at the C1/2 level showed hyperdensities suggestive of sub-acute subarachnoid hemorrhage (SAH). Patient was operated by a sub-occipital craniectomy and C1 posterior arch excision. The dura was opened by a Y-shaped incision. A large extra-axial mass lesion with surrounding hemosiderin was noted in the right postero-lateral foramen magnum region crossing the middle onto the left side. The lesion was extending superiorly into the cisterna magna and inferiorly up to the C2 spine level. The mass lesion was completely excised microscopically without any damage to the normal parenchymal and vascular structures. The patient recovered very well postoperatively without any fresh neurological deficits and was discharged on the sixth postoperative day. Histopathology of the lesion [Figure 4] showed numerous thin-walled vascular channels with congested lumina. There was dense fibroblastic reaction with hemosiderin laden macrophages and free hemosiderin pigment. The findings confirmed the diagnosis of cavernous hemangioma with bleed.
|Figure 1: CT brain (plain) showing a well-defined hyperdense mass lesion with areas of isodensity located in the right postero-lateral aspect of the foramen magnum|
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|Figure 2: MRI brain (T1-weighted) axial images showing a well-defined extramedullary iso-intense mass with surrounding hyperintensity|
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|Figure 3: MRI brain contrast axial (a), sagittal (b), and coronal (c) images showing an extramedullary mildly enhancing mass lesion with intra-lesional and subarachnoid bleed|
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|Figure 4: Histopathology of the surgical specimen showing numerous thin-walled vascular channels with broad congested lumina and areas of dense fibroblastic reaction with hemosiderin laden macrophages and free hemosiderin pigment (a and b). Hematoxylin and eosin; original modification, × 40|
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Clinical presentation of this patient along with the preoperative imaging suggested a high possibility of cavernoma with intra-lesional and SAH. Brainstem cavernomas account for 9-35% of the CNS cavernomas. , The overwhelming majority of intracranial and intraspinal cavernomas are intraparenchymal, with just a small fraction found in the epidural space. Extra-axial cavernomas are rare and are generally located in the cisternal space, arising from the dural surface or cranial nerves.  The majority of these are found in the dural sinuses or the cerebellopontine angle and only 29 cases of spinal intradural extramedullary cavernomas have been reported in the literature. , Of these, only five cases have been reported at the cervical level. Only one case of extramedullary foramen magnum cavernoma has been reported in the literature till date.
The unique features of our patient are: The location (foramen magnum), clinical presentation (SAH), and age (11 years). In the review of spinal intradural extramedullary cavernomas by Jin et al.,  the mean age at diagnosis was 47 (range 20-75), and only 10 (34%) cases presented with SAH. An extramedullary cavernoma presenting as SAH in pediatric age has not been documented. Classic symptoms of brainstem and spinal cavernous malformations include headaches or neck pain and mass effect. Our patient presented with symptoms of meningism and CSF findings were indicative of SAH. Er et al.,  suggested that SAH may present as the initial symptom of intradural extramedullary cavernoma. Both the cases of foramen magnum cavernomas reported, including our case, presented with SAH. This may be due to the direct communication of these lesions with the subarachnoid space. It has been postulated that the restriction of movement because of adherence to the spinal roots may make these lesions more likely to bleed.  In the author's view, due to the dynamism and wide range of movements at the foramen magnum, detachment of the adherent mass leads to frequent bleeds.
| » Acknowledgments|| |
I am extremely thankful to Dr. Anupama Koduru (Consultant Pathologist, Manipal Hospital, Vijayawada) for sharing the histopathological microphotographs of this patient.
| » References|| |
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[Figure 1], [Figure 2], [Figure 3], [Figure 4]