IMAGING DIAGNOSIS-MAGNETIC RESONANCE IMAGING FEATURES OF A MULTIFOCAL OLIGODENDROGLIOMA IN THE SPINAL CORD AND BRAIN OF A DOG

Abstract OBJECTIVE: Subependymomas are slow-growing, benign tumors usually found incidentally in the fourth ventricle at autopsy. They are typically associated with the ventricular system and become apparent clinically only when symptoms of hydrocephalus or mass effect develop. We review clinical, histological, and contemporary radiographic presentations of 16 subependymomas, including 2 intraparenchymal tumors. METHODS: We retrospectively evaluated eight patients with pathologically proven subependymomas. Initial magnetic resonance imaging and magnetic resonance spectroscopy were reviewed when available. Imaging was also available on eight outside subependymoma cases reviewed by our radiology department. RESULTS: Twelve of these subependymomas were intraventricular, one was in the posterior fossa, two were intraparenchymal, and one was an intramedullary spinal cord tumor. These lesions were hypo- to hyperintense on T1- and T2-weighted magnetic resonance imaging, with minimal to moderate enhancement. Initial complaints included headache, seizures, tingling sensations, and weakness. Among our eight patients who underwent gross total resection with no adjuvant therapy, no recurrences have been noted on follow-up magnetic resonance imaging. CONCLUSION: Subependymomas are rare, representing only 0.51% of all central nervous system tumors operated on during an 8-year period at the University of Utah. Clinical symptoms were associated with tumor location: intracranial masses caused headaches, seizures, and neurological complaints, and spinal cord locations resulted in neurological deficit. The authors review the clinical presentation, management, and contemporary radiographic appearance of this rare tumor.

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MAGNETIC RESONANCE IMAGING FEATURES OF TUMORS OF THE SPINE AND SPINAL CORD IN DOGS

Veterinary Radiology & Ultrasound ◽

10.1111/j.1740-8261.1999.tb00890.x ◽

1999 ◽

Vol 40 (6) ◽

pp. 627-633 ◽

Cited By ~ 61

Author(s):

Hege Kippenes ◽

Patrick R. Gavin ◽

Rodney S. Bagley ◽

Gena M. Silver ◽

Russell L. Tucker ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Spinal Cord ◽

Magnetic Resonance ◽

Imaging Features ◽

Resonance Imaging

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Magnetic Resonance Imaging Features of Intramedullary Spinal Cord Tumors with Pathological Correlations

The ASEAN Journal of Radiology ◽

10.46475/aseanjr.v19i1.22 ◽

2013 ◽

Vol 19 (1) ◽

pp. 51-66

Author(s):

Jureerat Thammaroj ◽

Amnat Kitkhandee ◽

Parinyaporn Tumkot ◽

Pichayen Duangtongpol ◽

Sakda Waraosawapati

Keyword(s):

Magnetic Resonance Imaging ◽

Spinal Cord ◽

Magnetic Resonance ◽

Signal Intensity ◽

Imaging Features ◽

Resonance Imaging ◽

Spinal Cord Tumors ◽

Intramedullary Spinal Cord ◽

Cystic Component ◽

Spinal Cord Ependymoma

Objective: The purpose of this study was to determine characteristic imaging findings of intramedullary spinal cord tumor in magnetic resonance imaging (MRI). Material and Methods: We retrospectively analyzed MRI in 15 patients with histologicaly proven intramedullary spinal cord tumors. The demographic data, MRI findings with histological findings were recorded in terms of age, location, length, morphology, signal intensity, the presence or absence of cyst and hemorrhage, enhancement pattern, other associated findings, necrosis, vascular proliferation and WHO grading. Results: Among the 15 patients, spinal cord ependymomas were eccentric 75%, well-define border 62.5% and cervicothoracic spine located 37.5%. Spinal cord astrocytomas were eccentrically located and ill-define border 85.7%, cervicothoracic and thoracic spine located 28.5%. A cystic component was seen in 87.5% of spinal cord ependymoma and 71.5% of astrocytomas. Intratumoral hemorrhage occurred in 75% of spinal cord ependymomas, and 57.1% of astrocytomas. In 12.5% of spinal cord ependymomas, a curvilinear low T2 signal, suggesting marginal hemorrhage, was seen at the upper and/or lower margins of the tumors. Twenty-five percent of spinal cord ependymoma and 57.2% of astrocytomas showed heterogeneous enhancement, while in 12.5% of spinal cord ependymomas, enhancement was homogeneous. Conclusion: Although no statistically significant characteristic MRI feature to distinguish between ependymoma and astrocytoma is detected. By percentage we found that border, length and signal intensity of tumors may help diagnosis. With pathological correlation, all of spinal cord ependymomas are mark hypervascular tumor, but astrocytomas never showed.

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Spectrum of Nonterminal Myelocystoceles

Neurosurgery ◽

10.1227/01.neu.0000197122.92954.82 ◽

2006 ◽

Vol 58 (3) ◽

pp. 509-515 ◽

Cited By ~ 39

Author(s):

Andrea Rossi ◽

Gianluca Piatelli ◽

Carlo Gandolfo ◽

Marco Pavanello ◽

Chen Hoffmann ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Spinal Cord ◽

Magnetic Resonance ◽

Normal Skin ◽

Subcutaneous Fat ◽

Clinical Findings ◽

Neurenteric Cyst ◽

Imaging Features ◽

Resonance Imaging ◽

Clinical Records

Abstract OBJECTIVE: To present the magnetic resonance imaging features, clinical findings, and possible embryologic bases for nonterminal myelocystoceles, a distinct subset of closed spinal dysraphisms. METHODS: We retrospectively analyzed imaging series and clinical records from five newborns and one older child with skin-covered soft tissue masses along the posterior midline spine. Spinal (6 patients) and brain (5 patients) magnetic resonance imaging was performed before surgical repair and compared with clinical findings, observations at surgery, and final lesion histology. RESULTS: The lesions affected the cervical (n = 3), thoracic (n = 2), and lumbar (n = 1) regions. In each case, the dome of the mass was covered by thickened, dystrophic epithelium with no subcutaneous fat, whereas the base and lateral walls of the mass were covered by normal skin. All patients were neurologically intact at presentation. In three cases, a stalk emanated from the dorsal normal spinal cord, crossed a narrow posterior bony spina bifida, and coursed through a posterior meningocele to attach to the inner aspect of its dome. The other three cases showed dissection of a hydromyelic cavity into the stalk, converting it into a second "cyst" within the meningocele. Concurrent anomalies included focal hydromyelia immediately cranial to the origin of the posterior stalk (n = 2), mild Chiari II malformation (n = 3), triventricular hydrocephalus from aqueductal stenosis (n = 1), filar lipoma (n = 1), and presumed neurenteric cyst (n = 1). At surgery, the sac was resected in all cases, but intradural exploration and untethering was performed in only three children. Embryologic considerations indicate that the spectrum of these lesions likely arises from partial limited closure of the neural tube, failed disjunction of the cutaneous ectoderm, and variable degrees of hydromyelia. CONCLUSION: The nonterminal myelocystocele is a distinct form of closed spinal dysraphism characterized by a skin-covered meningocele, which is either crossed by a fibroneurovascular stalk that extends from the dorsal aspect of the spinal cord to attach to the dome of the meningocele (abortive form, or myelocystocele manqué) or contains a hydromyelic cavity that is continuous with the ependymal canal of the spinal cord (complete form).

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