Recurrent intracranial meningioma with multiple pulmonary metastases: A case report
- Authors:
- Published online on: September 3, 2015 https://doi.org/10.3892/ol.2015.3670
- Pages: 2765-2768
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Copyright: © Wang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
Abstract
Introduction
Meningiomas are typically benign intracranial tumors, and rarely metastasize extracranially (1). Metastasis occurs in <1% of meningiomas, and common metastatic sites include the lung, liver, lymph node, bone and pleura (2). Tumors with malignant histological features are associated with a higher metastatic rate (3); however, there are reports of metastasis from benign meningiomas (2,4). Rawat et al (5) reported 77 cases of meningioma with extracranial metastasis in 1995, and ~70 additional cases of meningioma with extracranial metastasis were identified in the literature (2–4,6–27). There are no definitive criteria for the prediction of metastasis in meningiomas, and the discovery of metastasis frequently occurs following recurrence of the primary tumor (23–25). Therefore comprehensive examinations for patients with a history of recurrent intracranial meningioma are required for the detection of distant metastases, despite the tumor being benign.
Case report
A 54-year-old female was admitted to the Second Hospital of Hebei Medical University (Shijiazhuang, China) with primary symptoms of a progressive headache for the preceding 3 months, and nausea accompanied by vomiting for 4 days. Physical examination was normal, except for bilateral papilloedema. Chest plain radiograph was normal. Magnetic resonance imaging (MRI) revealed a contrast-enhancing tumor in the left base of the middle cranial fossa.
A gross total resection of the tumor (~6×5×5 cm) was performed via a left fronto-temporal craniotomy (Simpson Grade III) (28). Post-surgical pathological examination revealed a transitional meningioma with meningiothelial and fibroblastic components, which was classified as World Health Organization grade I (29). Immunohistochemical examination was not performed to explore the histological features. Postoperative computed tomography (CT) indicated that the tumor had been completely removed.
One year and 3 months later, the patient experienced tinnitus in the left ear and dizziness for 1 month. Magnetic resonance imaging (MRI) revealed a recurrent mass of 4×5×5 cm at the original site and the tumor was once again completely resected (Fig. 1). Pathological diagnosis was transitional meningioma with similar characteristics to those of the original tumor (Fig. 2). Following surgery, significant signs of impairment to the oculomotor nerve were observed. Radiotherapy was administered (specific radiation dose unknown) 1 month following the second surgery.
Eighteen months following the second surgery, the patient presented with a history of dizziness for 2 months, and MRI examination revealed another tumor recurrence at the original site. A pre-operative chest CT scan revealed multiple pulmonary nodules in the superior lobe of the right lung (Fig. 3). Gamma Knife (dose of total, DT: 12 Gy/50%, 8 mmx1 1) was used to remove the intracranial tumor; however, a postoperative MRI indicated that the tumor had not been completely removed. In order to clarify the nature of the lesions in the right lung, wedge resection of the superior lobe of the right lung was performed 7 days later, to remove the nodules located in the junction of the tip and posterior section under direct vision of a thoracoscope. The pathological report indicated transitional meningioma features, similar to those of the intracranial tumor. Histological examination revealed that the tumor was positive for vimentin and epithelial membrane antigen (Fig. 4). The nodules in the anterior segment were placed under observation.
The patient recovered uneventfully, and was discharged from hospital 10 days post surgery. The intracranial and pulmonary residual tumors were kept under follow-up observation. Compared with the previous image, it appeared that the tumor was enlarged as indicated in the follow-up CT/MRI scans (Fig. 3E). In view of no notable clinical symptoms at that time, the patient's family refused further surgical treatment to remove the residual mass.
To date, the patient remains in a relatively stable condition, except for Broca's aphasia. Regular clinical follow-ups for the patient will continue.
Discussion
Meningiomas are slow growing tumors, which are generally considered to be benign. Meningiomas account for 15–20% of all intracranial tumors, and are twice as likely to occur in females (1,30). Ectopic meningiomas are particularly rare and the majority originate from embryonic nests of arachnoid cells, which were trapped in ectopic locations during development. Hoye et al (31) classified these extracranial meningiomas into four groups, one of which is extracranial metastases of meningiomas.
Meningiomas rarely metastasize; however, cases of extracranial metastatic meningioma have previously been reported (3,4,6–9). According to current statistics, the lung is the most common site of metastasis (9). In addition, other sites, including the liver, lymph node, bone and pleura, may also occasionally exhibit metastases (2,10,32). Pulmonary metastases rarely induce symptoms in the patient. They typically present as single or multiple round, non-calcified parenchymal nodules of varying size, and multiple deposits are identified in 50% of cases (8). The mean interval between diagnosis of the primary tumor and discovery of the first metastases is ~6 years (8), although the longest interval documented was 24 years (33). In addition, metastases are frequently discovered following recurrence of the primary lesion.
However, the mechanisms underlying metastasis remain to be elucidated. Hematogenous metastasis may be the most likely mechanism for extracranial spread. Figueroa et al (10) revealed that in 75% of patients reported to have had metastasizing meningioma, metastases were associated with previous surgery on the primary lesion or invasion of the sinuses. A second route underlying the development of metastasis may be via the cerebrospinal fluid pathway (12). It was hypothesized that surgical interference may release the tumor from its cohesive state into the bloodstream or cerebrospinal fluid. However, despite the relatively large number of surgical resections performed, metastasis remains a rare event (4).
The World Health Organization classification of tumors of the nervous system details 15 histopathological variants of meningioma (26). Extracranial metastases from meningiomas are considered to be a significant indicator of malignancy, and have been found to arise in 11–23% of patients with anaplastic meningiomas (2,11,34,35). High proliferative potential, as indicated by mitotic rate, bromodeoxyuridine labeling index, proliferating cell nuclear antigen labeling index or MIB-1 monoclonal antibody staining of Ki-67 nuclear protein, has been suggested to enhance the risk of metastases (36). However, the clinical behavior of meningioma does not always correlate with histological features. A higher rate of cellular proliferation is not a requirement for the development of extracranial metastasis, and individual meningiomas of any histological subtype are able to metastasize (7,10,11,37).
In addition, a review of the literature suggested that there may be multiple risk factors for metastasis, including previous craniotomy venous sinus invasion, local recurrence, papillary morphology and histological malignancy (13).
In the present case, the time between diagnosis of the primary tumor and detection of right lung metastasis was ~2 years and 9 months, markedly shorter than the average time. Prior to detection of the distant metastasis, multiple craniotomies, radiotherapy and Gamma Knife treatments were performed in the present case. The patient exhibited no clinical symptoms for a significant time-period prior to the detection of multiple pulmonary nodules in the superior lobe of the right lung. The present case highlights the necessity for clinicians to perform comprehensive examinations for patients with a history of recurrent intracranial meningioma in order to detect distant metastases as early as possible, even though the tumors are benign. Although there was no clear evidence of spread through the hematogenous route or cerebrospinal fluid in the present case, elucidation of the mechanisms underlying hematogenous spread remains a priority.
Acknowledgements
This study was funded by the Natioanal Natural Science Foundation of China (grant no. 61271367).
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