Acute posterior fossa isodense epidural hematoma: diagnostic pitfalls on computed tomography.
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Accidents, Traffic↗
Biomedical subjects
Swei-Ming Lin
Publications and source records attributed to Swei-Ming Lin.
Acute spinal epidural hematoma after acupuncture.
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Acupuncture Therapy↗
Chimney sublaminar decompression for degenerative lumbar spinal stenosis.
OBJECT: The authors evaluated the efficacy and safety of so-called chimney sublaminar decompression, a new technique to decompress the degenerative stenotic lumbar spinal canal without stripping of the paravertebral muscles. METHODS: Eighteen patients (nine men and nine women whose mean age was 67 years) with symptoms of claudication were selected to undergo chimney sublaminar decompression. The duration of symptoms was greater than 6 months in 17 patients. Two lumbar segments were involved in seven patients, three in eight, and four in the remaining three patients. Central canal stenosis was present in 13 patients, and lateral recess stenosis in five patients. Mild spondylolisthesis was noted in seven patients. All the patients underwent chimney sublaminar decompression. After surgery, mild wound pain developed in 14 patients, moderate wound pain in two, and severe wound pain in two. The postoperative hospital stay was 4 days or fewer in 14 patients. At follow-up examination, excellent, good, and fair outcomes were achieved in 11, five, and two patients, respectively. No patient required a body brace, and no worsening of preexisting spondylolisthesis was detected. The spinal canal was increased to two- to 6.8-fold (mean 4.2-fold) the preoperative size. CONCLUSIONS: Compared with laminectomy or endoscopic surgery, the aforementioned chimney sublaminar decompression technique was an equally effective and less invasive technique in the treatment of degenerative lumbar canal stenosis.
Aged↗
Induction of T-cell apoptosis in rats by genetically engineered glioma cells expressing granulocyte-macrophage colony-stimulating factor and B7.1.
PURPOSE: To evaluate antitumor effects on intracerebral gliomas of genetically engineered tumor vaccines expressing granulocyte-macrophage colony-timulating factor (GM-CSF), B7.1, or both (combination). EXPERIMENTAL DESIGN: A rat glioma cell line, RT-2, was engineered with a retroviral vector to express GM-CSF, B7.1, or combination. Tumorigenicity of engineered cells and therapeutic effects of s.c. given irradiated or live tumor vaccines on parental intracerebral gliomas were studied. Immune cell infiltration induced at vaccine and tumor sites was examined by histologic and immunohistochemical staining. Apoptosis of T cells from vaccine sites was analyzed with fluorescence-activated cell sorting. RESULTS: Engineered RT-2 cells exhibited reduced s.c. tumorigenicity in rats with reduced tumor growth and prolonged animal survival time compared with control rats. Rats with intracerebral gliomas s.c. treated with irradiated or live GM-CSF-expressing vaccines had 60% and 100% survival rates, respectively, significantly better than the control groups (P < 0.05). In contrast, rats treated with vaccines expressing B7.1 or the combination had no or mild therapeutic effects. Studies revealed less T-cell infiltration at both vaccine and tumor sites in rats treated with vaccines expressing B7.1 or the combination than in rats treated with a vaccine expressing GM-CSF. Cell sorting analyses revealed higher proportions of apoptotic T cells at vaccine sites of rats treated with the combination than those treated with vaccine expressing GM-CSF. CONCLUSIONS: Combination of GM-CSF- and B7.1-expressing tumor vaccines exerted no synergistic, or even worse, therapeutic effects on gliomas compared with single GM-CSF-secreting tumor vaccine. The worse therapeutic effects of the GM-B7.1-expressing tumor vaccine than the GM-CSF-expressing tumor vaccine were related to the reduced T-cell amount and increased T-cell apoptosis in the former.
Animals↗
Cervical dumbbell meningioma and thoracic dumbbell schwannoma in a patient with neurofibromatosis.
The occurrence of both dumbbell meningioma and dumbbell schwannoma in one patient has not been reported in the literature. We present a 16-year-old female patient, who had progressive bilateral hearing impairment for 5 years and a progressively enlarged, non-tender neck mass for 1.5 years. Mild motor weakness over her right upper limb was noted 1 week before admission. No café-au-lait spot was noted. Magnetic resonance imaging (MRI) revealed bilateral cerebellopontine angle tumors, a C1-2 dumbbell tumor, and a T5-6 dumbbell tumor. Neurofibromatosis type 2 was diagnosed. The cervical spine and thoracic spine tumors were removed via one-staged combined posterior (laminectomy) and antero-lateral (transforaminal or thoracoscopic) approaches during two operations performed 1 month apart. The pathology revealed meningioma and schwannoma, respectively. The patient had good recovery after these two operations and her motor function improved. Six months after the second surgery, radiosurgery was performed for the bilateral acoustic tumors, because of enlarged tumor size on follow-up MRI. To the best of our knowledge, this is the first case reported in the literature of a patient, having both dumbbell meningioma and dumbbell schwannoma. A literature review of the dumbbell tumors was done, and their treatment strategies were discussed.
Adolescent↗
Sylvian fissure dermoid cyst with intratumoral hemorrhage: case report.
It is rare for a dermoid cyst to develop intratumoral hemorrhage. A 61-year-old woman had a sudden-onset left hemiparesis and slow response to verbal requests for one week when unenhanced computed tomography scanning revealed a mixed iso- and hypo-dense heterogeneous lesion in the right fronto-temporal area. T1-weighted magnetic resonance imaging (MRI) of the brain showed a mixed hyper- and hypo-intense tumor in the right fronto-temporal area. The tumor became hyperintense on T2-weighted MRI and was faintly enhanced at tumor periphery on T1-weighted MRI. The tumor was excised and pathological examination revealed a dermoid cyst with intratumoral hemorrhage. The post-operative course was complicated by hemorrhage in the tumor bed, which was evacuated immediately. The patient improved and could walk without support two weeks after the second operation. After 1 year of follow-up, she was well and without neurological deficits. To the best of our knowledge after a literature review, only two previous cases of dermoid cyst have featured intratumoral hemorrhage.
Brain Stem Neoplasms↗
Resveratrol suppresses the angiogenesis and tumor growth of gliomas in rats.
PURPOSE: We wanted to investigate the antitumor effects and effect on angiogenesis of resveratrol in rat RT-2 gliomas. EXPERIMENTAL DESIGN: RT-2 glioma cells were treated with resveratrol, and then cytotoxicity was assayed, apoptosis was measured by flow-activated cell sorter flow cytometry, and expression of vascular endothelial growth factor was measured by reverse transcription-PCR. Tumor size, animal survival time, and survival rate were followed in resveratrol-treated rats with s.c. or intracerebral gliomas. Furthermore, in vitro proliferation was assayed to explore the effect of resveratrol on the proliferation of ECV304 human umbilical vein endothelial cells. Expression of CD31 in resveratrol-treated gliomas was followed immunohistochemically to study the effect of resveratrol on the glioma-induced angiogenesis. RESULTS: Resveratrol was demonstrated to exert cytotoxic effects and induce glioma cell apoptosis in a concentration- and time-dependent manner (P < 0.05). Resveratrol (40 mg/kg/day) exerted significant antitumor effects on s.c. tumors, including slower tumor growth rate, longer animal survival time, and higher animal survival rate (P < 0.05). In contrast, resveratrol affected intracerebral tumors at only an increased dose (100 mg/kg/day), prolonging animal survival (P < 0.05) without affecting survival rate. The expression of vascular endothelial growth factor in the glioma cells and the proliferation of ECV304 cells were inhibited by resveratrol in a concentration-dependent manner. Immunohistochemical analyses showed that the s.c. gliomas from resveratrol-treated rats had fewer microvessel densities than did control rats (P < 0.01). CONCLUSIONS: Resveratrol caused significant glioma cell cytotoxicity and apoptosis, exerted antitumor effects on the s.c. and intracerebral gliomas, and inhibited angiogenesis in s.c. gliomas. Thus, resveratrol might be considered a possible treatment strategy for gliomas.
Angiogenesis Inhibitors↗
Activation of c-Jun N-terminal kinase 1 and caspase 3 in the tamoxifen-induced apoptosis of rat glioma cells.
PURPOSE: The mechanisms of the antitumor effects of tamoxifen upon gliomas are still unclear. In this study, we investigated the role of c-Jun N-terminal kinase-1 (JNK1) and caspase 3 in the tamoxifen-induced apoptosis of rat glioma cells. METHODS: Glioma cells were treated with tamoxifen, followed by a cytotoxicity assay to study its effects on the cells, and then a flow-activated cell sorter (FACS) analysis was performed to analyze the cellular apoptosis of the glioma cells. The expression of JNK1 and phospho-specific JNK1 in glioma cells treated with tamoxifen was investigated by Western blot analysis. The activity of caspase 3 in glioma cells was analyzed by caspase activity assay. RESULTS: Tamoxifen was demonstrated to exert cytotoxic effects upon and induced apoptosis of the glioma cells in a concentration- and time-dependent manner (P<0.05). Western blot analysis demonstrated that tamoxifen increased the expression of phospho-specific JNK1 in glioma cells, and an increasing concentration of tamoxifen induced an increasing expression of phospho-specific JNK1. Four-hour 50-microM tamoxifen treatment increased the expression of phospho-specific JNK1 to 3.2 times that of the control level in glioma cells. Tamoxifen also increased the activity of caspase 3 in glioma cells. Pretreatment of glioma cells with the antisense oligonucleotide (OGN) of JNK1 immediately prior to tamoxifen treatment suppressed the expression of phospho-specific JNK1 and the activity of caspase 3. The apoptosis fraction of glioma cells induced by 4-h treatment with 50 microM tamoxifen was decreased from 51% to 28% by pretreatment with the antisense OGN of JNK1 (P<0.003), and to 20% by pretreatment with caspase 3 inhibitor (DEVD-CHO) (P<0.0008). CONCLUSIONS: The results suggest that the tamoxifen-induced apoptosis of rat glioma cells is related to the activation of the JNK1/caspase 3 signaling pathway; however, the confirmation of the occurrence of such activation in vivo needs further investigation.
Animals↗
A lumbar clear cell meningioma with foraminal extension in a renal transplant recipient.
Spinal meningiomas are characteristically dural based. We report a lumbar clear cell meningioma extending into the intervertebral foramen without dural attachment which mimics a neurilemmoma. This is a rare finding, with no other reported cases in the literature. The importance of recognizing clear cell meningioma relates specifically to its inordinately aggressive clinical course. Compared to with of spinal clear cell meningiomas reported to date, our case showing the extension into the intervertebral foramen and mimicking a neurilemmoma is rather unique. Clear cell meningioma may be confused with other clear cell tumors, especially with the similar-looking metastatic renal cell carcinoma, which should be carefully ruled out in our case - an immunosuppressed renal transplant recipient.
Adult↗
Radiation-induced temporary alopecia after embolization of cerebral arteriovenous malformations.
Alopecia after endovascular embolization of cerebral arteriovenous malformations (AVMs) is uncommon. In this report, we present a 33-year-old man who developed temporary alopecia after staged embolization of a cerebral AVM. Four days after the last procedure, this patient had hair loss over his right temporoparietal and occipial areas. No scalp erythema or other sign of dermatitis was noted. The hair regrew 2 months later. The alopecia was considered to be related to repeated exposure to radiation during embolization. The experience in this case and review of the literature suggest that interventional neuroradiological procedures may cause substantial radiation exposure to the patient. Therefore, radiation use should be limited to the least amount necessary to complete the endovascular procedure to prevent radiation-induced biological changes and morbidity. Patients should be well informed of adverse effects such as alopecia.
Adult↗
Ruptured cervical disc after spinal manipulation therapy: report of two cases.
STUDY DESIGN: Case reports of ruptured cervical disc after spinal manipulation therapy. OBJECTIVES: To present the rare cases of ruptured cervical disc temporally related to spinal manipulation therapy. SUMMARY OF BACKGROUND DATA: The complication of ruptured cervical disc was rare in the literature. METHODS: Two patients developed cervical myelopathy or radiculopathy after spinal manipulation therapy, and magnetic resonance imaging showed herniated cervical discs at C4-C5 and C6-C7, respectively. RESULTS: Anterior cervical discectomy was performed, and ruptured disc fragments were removed in these two patients. Both patients had good neurologic recovery after operation, and no neurologic deficits were noted after 15 and 6 months of follow-up, respectively. CONCLUSIONS: The experience of these two patients reminds us that cervical disc rupture can occur during a course of cervical spinal manipulation. Full neurologic recovery is achievable if accurate diagnosis and prompt surgical treatment are done.
Adult↗
Effects of irradiated tumor vaccine and continuous localized infusion of granulocyte-macrophage colony-stimulating factor on neuroblastomas in mice.
BACKGROUND/PURPOSE: Immunomodulatory treatment has been proposed as a feasible strategy for neuroblastoma treatment. In this study, the antitumor effects of a continuous localized subcutaneous infusion of granulocyte-macrophage colony-stimulating factor (GM-CSF) into the injection site of irradiated tumor vaccine used as a source of tumor antigens on mouse neuroblastoma were investigated. METHODS: A/J mice were inoculated subcutaneously with wild type neuro-2a neuroblastoma cells and then treated with 5 doses of irradiated tumor vaccine or continuous localized infusion of GM-CSF (1 ng/d or 10 ng/d) via an osmotic minipump. Survival rates and survival times were compared among the groups. Tumor growth rates and animal survival times were followed and compared among different groups. Histologic and immunohistochemical analyses were performed to observe the immune response induced by various treatment strategies. RESULTS: Tumor growth rates were reduced significantly and survival times prolonged significantly by the treatment using tumor vaccine and continuous infusion of 10 ng/d of GM-CSF when compared with the control group (P <.05). One mouse treated with tumor vaccine and a 10 ng/d infusion of GM-CSF showed tumor regression and long-term survival, and no tumor growth was noted after rechallenge with wild-type neuro-2a cells. In contrast, using tumor vaccine only, or tumor vaccine combined with a 1 ng/d infusion of GM-CSF was less effective than tumor vaccine combined with a 10 ng/d infusion of GM-CSF (P <.05). Infusion of GM-CSF alone had no antitumor effects. Immunohistologic analyses showed significant CD4+ and CD8+ T cell infiltration of the tumor in the mice treated with tumor vaccine and a 10 ng/d infusion of GM-CSF. CONCLUSIONS: The results suggest that an irradiated tumor vaccine combined with continuous localized infusion of GM-CSF may induce a tumor-specific antitumor immune response that can suppress tumor growth and prolong survival. Such a treatment strategy deserves consideration as a possible adjuvant treatment for neuroblastoma.
Animals↗
Multiple tuberculous brain abscesses.
Multiple tuberculous brain abscesses are rare. This report presents a female patient with a rapidly deteriorating clinical course. Computed tomographic scanning revealed multiple brain abscesses. Aspiration of one of the lesions yielded pus and positive acid-fast stained bacilli. The pathogenesis of multiple tuberculous brain abscesses is discussed.
Adult↗
Cervical epidural hematoma after spinal manipulation therapy: case report.
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Aged↗