|Year : 2019 | Volume
| Issue : 2 | Page : 372-377
Surgical treatment of spinal ependymomas: outcome in Al-Zahraa University Hospital
Gasser H Al-Shyal, Abd-El-Fatah A Shehab
Department of Neurosurgery, Faculty of medicine for girls, Al-Azhar University, Cairo, Egypt
|Date of Submission||15-Apr-2019|
|Date of Acceptance||15-May-2019|
|Date of Web Publication||24-Oct-2019|
MD, PhD Gasser H Al-Shyal
Department of Neurosurgery, Al-Azhar University, Cairo
Source of Support: None, Conflict of Interest: None
Introduction Spinal ependymom as are rare tumors and present mainly around 40 years of age. Total resection is claimed to be the best option for the treatment, but it carries some risk and it needs good evaluation and may be some proper facilities to get satisfactory results.
Aim The aim of this study was to investigate the surgical strategies and outcomes for spinal ependymomas of different lengths and locations. We present our surgical experience in Al-Zahraa University Hospital (Al-Azhar University) for managing spinal cord ependymomas.
Patients and methods We report the results of eight patients over a 2-year period (2016–2018). All cases were managed in Al-Zahraa University Hospital. Surgery was recommended for all patients who have symptoms. Preoperative and postoperative clinical assessments were done for all cases.
Results There were six men and two women. The mean age was 36.4 years (range, 24–60 years). The follow-up period ranged from 1 month to 2 years. Gross total resection was done in six (75%) cases. Near-total resection was done in one case, and partial resection was done in one cervical case. The overall postoperative complications rate was 12%. Seven of the eight cases improved clinically. Pain improved in seven (87.5%) cases. All three cases with weakness improved within the first week of surgery or during the first 6 months (postoperative follow-up period). Sphincters improved in three out four cases that had been presented with sphincters.
Conclusion Most spinal ependymomas can be managed by gross total resection without significant morbidity. Neurological deficit occurred more in tumors that extend more than two spinal levels. Some cases have early postoperative neurological functions declination, but these cases improved during follow-up. It is better to use neurophysiological monitoring, but it is not essential for achieving good outcome.
Keywords: ependymoma, filum terminal, myxopapillary, spinal tumors
|How to cite this article:|
Al-Shyal GH, Shehab AEA. Surgical treatment of spinal ependymomas: outcome in Al-Zahraa University Hospital. Sci J Al-Azhar Med Fac Girls 2019;3:372-7
|How to cite this URL:|
Al-Shyal GH, Shehab AEA. Surgical treatment of spinal ependymomas: outcome in Al-Zahraa University Hospital. Sci J Al-Azhar Med Fac Girls [serial online] 2019 [cited 2020 Oct 22];3:372-7. Available from: http://www.sjamf.eg.net/text.asp?2019/3/2/372/269856
| Introduction|| |
Spinal ependymomas are rare tumors and present around 40 years of age . They constitute ∼15% of spinal cord tumors . Most spinal ependymomas are intramedullary, but intradural extramedullary and extradural ependymomas are known to rarely occur as well .
The WHO classifies spinal ependymoma into three different grades: grade I, grade II, and grade III . The WHO classified ependymomas into four distinct subtypes: subependymomas, myxopapillary ependymomas, classic ependymomas, and anaplastic ependymomas . These groups are further divided into cellular (most common), papillary, clear cell, and tanycytic subtypes . Tumors in the classic ependymoma group typically occur in the cervical and sometimes thoracic region, whereas those of the myxopapillary group tend to be in the conus medullaris and cauda equina ,. Anaplastic ependymomas carry the worst prognosis and are extremely rare, occurring most often in the brain .
Spinal ependymomas may affect any age group, but they are typically found in adults and comprise the myxopapillary or classic subtypes. Myxopapillary ependymomas are generally encapsulated and reside primarily in the conus medullaris but may extend to the cauda equina. Classic ependymomas generally form in the cervical spine, but occasionally develop in the thoracic region .
Most ependymomas are slow growing and tend to compress the adjacent cord parenchyma rather than infiltrating it, thus creates a clear surgical plane. At the time of surgery, most spinal ependymomas are contained within well-defined margins, thus facilitate resection through natural dissection plan and excision of the tumor without injury of cord parenchyma .
Despite this grading system, factors affecting recurrence and progression of disease following resections are poorly understood. Whether tumor location along the spinal cord conveys any prognostic value is unknown. However, some evidence suggests that tumor location may be more important than tumor grade in determining prognosis. For example, spinal ependymomas generally have a better prognosis than intracranial tumors . Regarding location, there are two major types of spinal ependymomas: the first type is the WHO grade I myxopapillary ependymomas, which occur more often in males, primarily at the cauda equina, conus medullaris, and filum terminale , and the second type is the WHO grade II classic ependymomas, which occur most frequently in the cervical and thoracic spinal cord segments .
Spinal ependymomas can be present with symptoms that help to localize the tumor. Limb weakness is very common in patients with thoracic ependymomas. However, patients with conus ependymomas less commonly present with limb weakness, but more frequently, they present with low back pain. Neck pain is more common in tumors at cervical region. Sphincteric disturbances are present with all tumor sites of the cord but are more frequent with dorsolumbar, lumbar, conus and filum ependymomas .
The neurological deficit and deterioration are common after excision of spinal cord ependymomas. The preoperative clinical condition is used as a strong predictor of prognosis after surgical excision . Tumors originating in the thoracic region have relatively worse prognosis owing to poor microcirculation of the cord and narrow spinal canal . We present our surgical experience in Al-Zahraa University Hospital (Al-Azhar University) for managing spinal cord ependymomas.
| Patients and methods|| |
This study was carried out at Al-zahraa University Hospital, after approval from the local ethical committee, and the Department of Neurosurgery and after written informed consent was obtained from each patient. A total of 8 pateints were managed at Al- Zahraa University Hospital in 2 year interval between 2016 and 2018. Surgery was recommended for all patients who have symptoms. Preoperative and postoperative clinical assessments were done for all cases.
All tumor specimens were sent for histopathological examinations and grading. All tumors were confirmed as ependymomas. Preoperative diagnosis was done with contrast-enhanced MRI. All patients were operated in prone position, and we did not apply the strategy to keep the main arterial blood pressure above 80 mm. Tumor removal was considered near-total resection when at least 80% of the tumor was excised. Partial resection was consistent with a less than 80% resection. There are no standards for postoperative adjuvant radiotherapy at our institute.
We used the surgical microscope in all cases. If the tumor reached to the surface, we open it at this point. If it did not bulge to the surface, we used midline myelotomy without using bipolar coagulation. The midline in a normal cord is identified by the dorsal median sulcus between the elevated posterior columns, midway between the two opposing root entry zones, and also the pattern of transverse arteries and central vein on the dorsum of the cord. We widened the opening by catching the pia on both sides of the cord and separate it with fine-tipped jewel forceps. We started debulking with a tumor forceps without pulling on the tumor via crushing tumor tissue and taking the fragments out. After developing a good cleavage plane between the tumor and cord, we dissected the last rim of the tumor. Hemostasis was achieved with copious saline irrigation avoiding usage of bipolar cautery. In all cases, we did not use neurophysiological monitoring as it is unavailable in our institute. Intraoperative and postoperative prophylactic antibiotics were used routinely in our institute. All cases were examined on the same day after surgery and followed up for at least 6 months.
| Results|| |
There were six men and two women. The mean age was 36.4 years (range, 24–60 years). The follow-up period ranged from 1 month to 2 years. The patient characteristics are summarized in [Table 1].
The duration of symptoms before diagnosis ranged from 6 months to 2 years. Five cases had spinal cord ependymomas and the remaining three had filum terminal ependymomas. Pain was the most frequent symptom, and it was present in all eight cases. Two filum terminal cases had sciatica. Three (37.5%) patients had weakness. Pyramidal manifestations were present in two (25%) cases, and both were cervical. Sphincteric disturbance was present in four (50%) patients.
MRI findings and resection
MRI scans showed tumors at the cervical regions in three (37.5%) patients. Tumors in the dorsal region were present in two (25%) patients, and three (37.5%) patients had tumors in the lumbar region. Only two cases had tumors that spanned more than two vertebral levels. Gross total resection (GTR) was done in six (75%) cases. Near-total resection was done in one case, and partial resection was done in one cervical case.
The overall postoperative complications rate was 12%. One case was complicated with paraplegia and incontinence. It did not improve during the follow-up period. In this case, the tumor was extended over seven levels of dorsal spines from D6 to D12. Long-segment myelotomy was needed. One more patient experienced slight increase in his weakness (milder weakness was present preoperatively), but this improved and returned to normal function during the follow-up period.
Improvement of neurological functions and pain
Seven out of the eight cases improved clinically. Pain improved in seven (87.5%) cases. All three cases with preoperative weakness improved within the first week of surgery or during the first 6 months (postoperative follow-up period). Sphincters improved in three out of four cases that had been presented with sphincters ([Figure 1] and [Figure 2]).
|Figure 1 (a) T1 contrast-enhanced sagittal MRI of a 26-year-old male that was done before surgery. (b) T2 sagittal MRI shows extensive edema. (c) T1 contrast-enhanced MRI 1 month after surgery. It shows complete resection of the lesion and disappearance of the enhancement. (d) T2 MRI shows significant improvement of cord edema 1 month after surgery.|
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|Figure 2 (a) Preoperative T2 sagittal MRI of a 40-year-old male showing filum terminal ependymoma. (b) and (c) Sagittal MRI was done 2 months after excision showing complete removal without any enhancement.|
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Analysis of neurological deterioration and complications
One case was complicated with paraplegia and incontinence. It did not improve during the follow-up period. In this case, the tumor was extended over seven levels of dorsal spines from D6 to D12. Long-segment myelotomy was needed. Severe hypotension was inflicted by the anesthesiologist all throughout the time of surgery. Main arterial blood pressure was around 58 mmHg. Hemostasis was done by saline-soaked gel foam in the tumor bed. All these factors cumulated, and by the end of surgery, the cord became pale whitish (massive ischemia).
| Discussion|| |
In the past, complete resection of spinal ependymomas was believed to be impossible and was associated with significant morbidity and mortality ,. The traditional surgical management was biopsy or partial removal, followed by radiotherapy. With advances in the knowledge and surgical equipment’s such as operating microscopes, most spinal ependymomas can be managed by GTR, with less complications and improved outcomes. Spinal cord ependymomas are diagnosed most frequently in the fourth decades of life ,,,,. We found this in our series as the main age at surgery was 36.4 years. We found male predominance in our study, and this is comparable to many previous studies ,,,,.
Huang and Lin  found the most frequent symptom is weakness of the extremities (76.5% of their patients). Others found that the most common presenting symptom is pain either local or radicular pain, which may delay the diagnosis of spinal cord ependymomas because these symptoms are nonspecific . All cases in our series presented with pain. Sphincter dysfunction ranged from 18 to 40% in many studies ,,, but we found that four cases of our eight cases had sphincteric affection. McCormick and Stein  reported that five of 23 patients experienced bowel and bladder dysfunction in the preoperative period. Klekamp  found that half of his filum terminal cases had sphincteric affection. We found the same, as half of our filum terminal cases had sphincter dysfunction. Pyramidal manifestations were found in two cases of our eight cases, and they were found only in cervical ependymomas.
Huang and Lin found hyperreflexia in 10 of 17 cases of spinal ependymomas. Oh et al.  found that spinal ependymomas occur most frequently in cervical (32%) and conus+cauda (26.8%). Wild et al.  found 29% of their ependymoma cases have cervical ependymomas and 36% of the cases have conus and filum ependymomas. This was confirmed in our series, as seven of our eight cases have ependymomas in one of these locations.
Wild et al.  found that 65% of their ependymoma cases have WHO grade II, 15% grade I, and 4% grade III. In our series, most of the cases were ependymoma grade II.
In many series, GTR ranged from 52 to 86.3% ,,. In our case series, we are in this range, as we did GTR in six (75%) of our eight patients. Keil et al.  confirmed that GTR is preferable in de-novo cases, and it is the most important factor for desirable outcome. Huang and Lin  suggested that it is reasonable to estimate that total resection is possible in 80–90% of the patients with spinal ependymomas. In our series, GTR was achieved in all filum terminal cases except one case that had invaded the conus. In a study done by Klekamp  on 29 patients with filum terminal ependymomas, he found that GTR was feasible in 77% of these cases.
Complications are not uncommon with spinal cord ependymoma surgeries. Early complications rate was 23.5% in a study done by Huang and Lin. These includes two patients in whom postoperative extubation was unsuccessful. Another patient developed wound infection and CSF leak and two patients with urinary tract infection . In another study done by Keil et al. , short-term complication rate was 24.6% . We did not encounter any of these short-term nonneurological complications in our study. Regarding postoperative neurological deterioration, Huang and Lin  found the incidence of neurological deterioration after primary resection of spinal ependymomas was 29.4%. Aghakhani et al.  observed that 88% of the patients showed improvement or stabilization by the operation at the end of the follow-up period. In our series, one case showed neurological deterioration and the other seven cases showed improvement in their neurological status.Some reports have failed to identify a statistically significant increase in prognosis with the utilization of neurophysiological monitoring techniques . Alkhani et al.  reported that patients did well regardless of monitoring status. We do not have these monitoring facilities at our institute, and all cases were operated without monitoring. Despite that, we got results similar to the surgeons who had used this technique. Although this modality cannot independently provide a holistic evaluation of spinal cord and root integrity, its use can allow surgeons to proceed with enhanced precision and confidence that the risks of neurological damage have been minimized .
| Conclusion|| |
Most spinal ependymomas can be managed by GTR without significant morbidity.
In our study, permanent neurological deficit occurred in one case out of eight cases. Neurological deficits occurred more in tumors that extend more than two spinal levels. Some cases presented with declination in neurological functions in the early postoperative period, but these cases improved in the follow-up period. It is better to use neurophysiological monitoring, but it is not essential for achieving good outcome.
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Conflicts of interest
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