Tumours of the cauda equina. The problem of differential diagnosis

Lumbar Schwannoma as a Rare Cause of Radiculopathy in the Chiropractic Office: A Case Report

Cauda equina tumors are rare, slow-growing, and typically benign. These tumors present with low back pain resembling disc displacement with radiculopathy and thus may go undiagnosed for months. A 52-year-old, otherwise healthy man presented to a chiropractor with a one-year history of worsening low back pain radiating to the right lower extremity, rated an 8/10 in severity and aggravated by recumbency. Previously, his primary care physician had ordered radiographs revealing mild lumbar degenerative changes, prescribed a non-steroidal anti-inflammatory medication, and referred him to an orthopedist and physical therapist. There had been no change in symptoms. Upon examination by the chiropractor, the patient had neurologic deficits, and due to progressive worsening, the chiropractor recommended magnetic resonance imaging (MRI), which the patient deferred due to cost. The chiropractor initiated a trial of care, with initial success; however, the patient's symptoms recurred, and he consented to an MRI. MRI revealed an intradural extramedullary lumbar tumor, and the chiropractor referred the patient to an oncologist, who referred the patient to a neurosurgeon. The neurosurgeon surgically removed the mass, with a biopsy confirming a schwannoma. The patient had significantly improved six weeks after surgery. This case highlights a patient with chronic low back pain for whom a chiropractor identified a cauda equina tumor and referred him for further evaluation and surgery. Clinicians should consider night pain and persistent symptoms, despite conservative care, as red flags warranting further investigation in those with low back pain. Providers should refer for neurosurgical evaluation when clinical and radiological findings suggest a cauda equina tumor.

Tumors in the cauda equina: A SEER analysis of tumor types and predictors of outcome

Caudaequinatumors are histologically diverse. International Classification of Diseases for Oncology (ICD-O3) confers dedicated site code (C72. 1) for cauda equina. This code is excluded during analyses of other primary spinal cord tumors. In this retrospective study, the Surveillance, Epidemiology and End Results (SEER) data for primary cauda equina tumors (PCET, C72. 1) excluding the tumors of spinal meninges (C70. 1) from 1992 to 2015 were reviewed. Demographic characteristics, tumor types, and clinical outcomes were analyzed using univariable analysis. Overall survival was estimated using Kaplan-Meier methods and compared for age, histology and treatment type. 293 patients with PCET met inclusion criteria. The most common tumors comprised schwannoma (32%), myxopapillary ependymoma (21%), malignant ependymoma (22%). The median age at diagnosis was 50 years (range < 1 year to 98 years), 57% of patients were males. 77% of the patients underwent surgery. Median follow up time for these patients was 70 months. Of the 293 patients, 250 (85%) were living at the end of 2015. The cause of death was tumor or CNS related in 15 patients. 136 patients were followed for <5 years, of which 102 were censored and 34 died (11.6%) before 5 years. Using univariable analysis, age at diagnosis (Hazard Ratio, HR 1.05; confidence interval, CI 1.03-1.07; p < 0.001), malignant tumor type (HR 2.88, CI 1.15-7.19, p = 0.0239) and absence of surgical intervention (HR 2.54, CI1.26-5.11, p = 0.0092) were predictors of increased mortality. Although most patients did well, older age and lack of surgical intervention were associated with worse survival.

Intradural metastasis to the cauda equina found as the initial presentation of breast cancer: a case report

BACKGROUND

Intradural extramedullary spinal metastasis is a relatively rare condition. Furthermore, there are few reports with the initial presentation being a neurological symptom from an intradural metastasis. We report a case of a patient with metastasis to the cauda equina from breast cancer found due to neurological symptoms as the initial presentation.

CASE PRESENTATION

A 76-year-old Japanese woman who was previously healthy presented to our hospital with bilateral severe buttock and lower extremity pain without any history of injury. A solitary intradural cauda equina mass was found by magnetic resonance imaging at the L2/3 level, and we suspected a schwannoma initially. The patient hoped to undergo surgery due to the severe pain. However, the chest computed tomographic scan obtained to assess the patient's general status showed the suspected breast cancer of the left side and a lung metastasis. Hence, we considered the possibility of cauda equina tumor metastatic from the breast cancer. We performed an L1-3 laminectomy and tumor extirpation. The pathology revealed adenocarcinoma. After surgery, she had relief from pain, and her status remained satisfactory until she died 9 months after surgery.

CONCLUSIONS

It is difficult to clarify whether the cauda equina tumor is benign or malignant based only on Magnetic resonance imaging findings. Clinicians should consider the possibility of metastasis when planning the surgery for intradural cauda equina tumor extirpation.

Conus medullaris and cauda equina tumors: clinical presentation, prognosis, and outcome after surgical treatment: clinical article

OBJECT

Intradural cauda equina and conus medullaris tumors (CECMTs) are rare. Only a few large clinical series exist to date. Therefore, clinical symptoms, surgical complications, and outcomes are poorly understood. The aim of the present study was to evaluate outcome after surgery of CECMTs and to identify the factors associated with a worse clinical prognosis based on the results of a series with sufficiently high number of cases.

METHODS

All cases of intradural CECMTs treated surgically at the authors' department between March 2006 and May 2012 were retrospectively evaluated. Arachnoid cysts and multifocal tumors were excluded. Sixty-eight adult patients met the inclusion criteria (35 female and 33 male patients; median age 56 years). Follow-up data were available for 72% (n = 49) in a median period of 9 months.

RESULTS

Overall, 18 tumors were located intramedullary and 50 extramedullary. The majority were nerve sheath tumors (n = 27), ependymomas (n = 17), and meningiomas (n = 9). The most common preoperative symptom was pain. The rate of new transient postoperative impairment was 18% (n = 12), and new permanent deficits were observed in only 6% (n = 4). Overall neurological improvement was achieved in 62%. The reversibility of preoperative symptoms was related to the interval between the time of symptom onset and the time of surgery and to the presence of preoperative neurological deficits. Surgery of ependymoma and carcinoma metastases was associated with a higher rate of morbidity.

CONCLUSIONS

Intradural CECMTs present as a group of tumors with varying histological features and clinical symptoms. Symptomatic manifestation is usually unspecific, mimicking degenerative lumbar spine syndromes. Despite a significant risk of transient deterioration, early surgery is advisable because more than 94% of patients maintain at least their preoperative status and more than 60% improve during follow-up. The reversibility of preoperative symptoms is related to the duration between symptom onset and surgery and to the presence of preoperative neurological deficits. The prognosis for recovery from cauda equina or conus medullaris syndrome is less favorable than for other deficits. Surgery of ependymoma is associated with a higher morbidity rate than other benign entities.

Surgical treatment of rare cauda equina tumours

BACKGROUND

Cauda equina tumours (CET) are rare and usually benign. Treatment of schwannomas and benign ependymomas, which are the most frequent histopathological types of CET, is now well established. However, management of other presumed histopathological types of CET is still a matter of debate. The aim of this study was to assess the incidence and the surgical treatment of rare CET.

METHOD

A retrospective study was carried out on 176 adult patients surgically treated for CET in our two departments from 1994 to 2010. We reviewed pre- and postoperative symptoms, magnetic resonance imaging aspects, surgical findings, outcome including operative neurological morbidity, local recurrence rate and operative mortality, and incidence of rare CET.

FINDINGS

Seventeen percent (30 patients) of CETs operated on were neither schwannomas nor benign ependymomas. Half of these cases were benign tumours, with paragangliomas being the most common. Two patients were in poorer clinical condition after surgery, one patient experienced a local recurrence, and one died following surgery, from the progress of his disease (Von Hippel-Lindau disease). The other half were malignant tumours, with metastases being the most common. One third of the patients were worsened by surgery, and the mortality rate was 1/3 at 8 months (1-27 months).

CONCLUSIONS

Roughly one in six CET were neither schwannomas nor benign ependymomas. This study demonstrated the efficiency of surgery for rare benign CET with a low local recurrence rate. Surgical treatment of rare malignant CET led to a high rate of increased postoperative neurological deficit in patients with a reduced life expectancy.

A rare case of metastatic renal cell carcinoma resembling a nerve sheath tumor of the cauda equina

We present a rare case of solitary metastasis to the cauda equina from the kidney. The patient was a 68-year-old man with a two-year history of low back pain. His past medical history revealed a renal cell carcinoma diagnosed seven years earlier. His lumbosacral MR imaging showed a well-demarcated, intradural extramedullary mass at the L3 level. He underwent an L2-4 laminectomy. The operative findings of the tumor quite resembled that of a nerve sheath tumor. It did not infiltrate into the subarachnoid space and involved only one spinal nerve. Pathology of the tumor was a metastasis of the renal cell carcinoma. Only 10 cases with such a metastasis to the cauda equina have been reported in the English literature. We added the 11th and reviewed the literature with reference to tumor pathologies, clinical findings and route of metastasis to the cauda equina.

Cauda equina compression by malignant lymphoma: long-term survival following multimodality therapy

Malignant lymphoma compression of the cauda equina is rare. In the literature only a few cases have been described with occasional long term survivors. We report another case of non-Hodgkin's lymphoma presenting with cauda equina compression. Significant palliation and long-term survival were achieved after therapy by decompressive, cytoreductive surgery; local irradiation; and chemotherapy.

Potential neurotoxicity of spinal anesthesia with lidocaine

Spinal (intrathecal) anesthesia has evolved into a safe, widely accepted method of anesthesia with many advantages. However, the past decade has seen a large number of case reports and incidence studies that implicate the local anesthetic (LA) lidocaine as being more neurotoxic than other commonly used LAs such as bupivacaine and tetracaine, based on patterns of clinical use current at the time of those reports. Available studies suggest a risk of persistent lumbosacral neuropathy after spinal lidocaine by single injection in about 1 in 1300 procedures and a risk as high as about 1 in 200 after continuous spinal anesthesia with lidocaine. While uncommon, this risk is probably an order of magnitude higher than the risk reported for other commonly used LAs or for general anesthesia. Spinal lidocaine is also implicated in the syndrome of transient neurologic symptoms (previously referred to as transient radicular irritation), manifest by pain or dysesthesia in the buttocks or legs after recovery from anesthesia. Although the pain typically resolves within 1 week without lasting sequelae, it can be severe in up to one third of patients with the syndrome. In addition to clinical studies, both whole animal and in vitro studies have shown that lidocaine can be neurotoxic at clinically available concentrations and that lidocaine is more neurotoxic than equipotent concentrations of other commonly used LAs. The mechanism of this neurotoxicity may involve changes in cytoplasmic calcium homeostasis and mitochondrial membrane potential.

Lesions of the cauda equina: a clinical and pathology review from the Armed Forces Institute of Pathology

We reviewed the clinical records of 149 patients with pathologically proved cauda equina lesions in order to define the relative frequency and clinical presentations of the various diagnoses. The most common pathology was ependymomas (47 patients) followed in frequency by nerve sheath tumors (35 patients), metastases (27 patients), nonependymal glial neoplasms (six patients), meningiomas (six patients), lipomas (five patients), paragangliomas (five patients) and various other diagnoses (19 patients). Mean patient age at presentation for the various lesions included: metastases (51.5 years), nerve sheath tumors (49.7 years), nonependymal glial tumors (46.5 years), paragangliomas (41.2 years), ependymomas (38.3 years), meningiomas (34.7 years), and lipomas (18.4 years). ANOVA showed that the relationship between age and diagnosis for these groups to be statistically significant at a high level (P = 0.002). Low back pain was the most common symptom and occurred in 44 patients. Other symptoms included unilateral lower extremity pain or tenderness (24 patients), bilateral lower extremity pain or tenderness (16 patients), and bilateral lower extremity weakness (16 patients). No relationship between pathologic diagnosis and specific symptoms was found.

Epithelioid sarcoma of the spine: a case report

STUDY DESIGN

This case report illustrates a patient presenting with sciatica and diagnosed with epithelioid sarcoma involving the spine.

OBJECTIVES

The treatment of this patient involved multiple mass resections and decompressions of the spinal canal. Radio- and chemotherapy were applied once a clear diagnosis was obtained.

SUMMARY OF BACKGROUND DATA

Epithelioid sarcoma is a rare tumor mainly arising in the extremities. Confusion with a benign inflammatory process are possible. Treatment after histologic diagnosis involves wide resection. To our knowledge, this report represents the first case of epithelioid sarcoma involving the spine.

METHODS

After initial discectomy, recurrent scarring and mass formation required multiple decompression procedures and fusion. The initial pathology revealed inflammatory reaction on fibrosis. In a later procedure, the histologic diagnosis of epithelioid sarcoma was made. Radiotherapy and chemotherapy were begun immediately.

RESULTS

Despite aggressive resections, radiotherapy, and chemotherapy, the patient died 3 months after the last surgical procedure.

CONCLUSION

Spinal epithelioid sarcoma can be mistaken for a benign inflammatory process. After a histologic diagnosis, aggressive wide resection is necessary. Multiple recurrences are documented with this tumor in other sites. Prognosis in trunk involvement is less favorable than involvement of the extremities. The role of adjuvant radio- and chemotherapy is unclear for spinal involvement.

Intradural tumors of the cauda equina: a single institution review of clinical characteristics

A retrospective review of 106 cases of intradural tumors of the cauda equina are presented, subdivided into 5 groups according to their histological characteristics. For each group the clinical course and long-term postoperative results were analyzed: it emerged that differential diagnosis between neurinomas, meningiomas or non-tumoral lesions is not possible based on clinical findings alone and that neuroradiological diagnosis is more accurate when MRI is employed. Long-term prognosis was always favorable with the exception of the group of ependymomas. Nevertheless, early diagnosis in the latter group of tumors gives excellent results because prognosis is apparently directly correlated to the length of preoperative clinical history.

Neurinomas of the cauda equina clinical analysis of 40 surgical cases

We report a retrospective study conducted on 40 patients with neurinoma of the cauda equina, assessing the clinical features and treatment. Neurinomas are clinically indistinguishable from other tumours localized in the same region. It is possible, but not simple, to differentiate neurinoma of the cauda equina from more common lumbar disc herniations. In the early stage, neurinomas provoke sciatic pain that is unilateral and monoradicular, worsened in decubitus and hard to define, whereas in the later stage pain becomes bilateral, polyradicular and is mostly accompanied by motor and sensory disturbances. Moreover, Lasegue's sign was often absent. Therapeutically, total removal of the tumour seems to be the most appropriate form of treatment given that even the sacrifice of a root does not worsen any pre-existing neurological deficit.

A cauda equina syndrome in a patient treated with oral anticoagulants. Case report

The authors report a patient who was on oral anticoagulants because of mitral valve disease and who developed paraplegia from subarachnoid bleeding involving the cauda equina. The differential diagnosis, investigations and treatment of the cauda equina syndrome are described.

Multiple spinal neurinomas presenting visual disturbance as the initial symptom: case report

A case of multiple spinal neurinomas with visual disturbance is reported. A 63-year-old man was admitted with a complaint of progressive visual disturbance due to papilledema without spinal symptoms and signs. The neuroimaging studies demonstrated communicating hydrocephalus and two mass lesions in the cauda equina. Both tumors were found to be neurinomas. Intracranial hypertension secondary to spinal tumors is unusual, and multiple spinal neurinomas are rare. In the patient without spinal symptoms and signs, it is difficult to make a diagnosis of spinal tumor. Importance of checking for a spinal cord lesion by magnetic resonance imaging in such a case is stressed.

Tumors of the cauda equina: the importance of an early diagnosis

The natural history of cauda equina tumors was studied in 13 patients. Pain was the most prominent clinical manifestation. Neurological dysfunction mainly consisted of sensory disturbances. The pre-operative course was in 62% three years or longer. A relation was found between the histology of the tumor and the delay of diagnosis: ependymomas were discovered much later than schwannomas. Other histological types of tumors were meningioma, sarcoma and metastasis of a medulloblastoma. The effect of treatment, in nine cases only surgical, was excellent in seven of the 13 patients. The prognosis was determined by histology and length of pre-operative period.