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Biomedical subjects

R L Ragland

Publications and source records attributed to R L Ragland.

At least 19 recordsLinked to original sources
PubMed1998

Basimeningeal/spinal axis primitive neuroectodermal tumor without intraaxial lesion: radiological features.

Over a 12-year period, the authors encountered 2 patients with spinal axis/basimeningeal primitive neuroectodermal tumor (PNET) involving the spinal axis extramedullary, intradural compartment and the basimeninges. In neither patient was an intraaxial focus demonstrated. A 48-year-old woman had computed tomography (CT) findings of hydrocephalus and later abnormal basimeningeal enhancement. Cervical myelography revealed a low cervical intradural block. A 10-year-old boy was evaluated initially with non-contrast-enhanced CT of the brain, which revealed hydrocephalus. Contrast-enhanced CT revealed abnormal basimeningeal enhancement implicating cisternal obstruction. Subsequent magnetic resonance examination of the entire spine with and without gadolinium enhancement revealed diffuse abnormal enhancement of the spinal axis intradural, extramedullary compartment. While intraaxial PNETs are well recognized, the patients described here represent a distinctly unusual pattern of intradural spinal meningeal and basimeningeal infiltration by PNET in the absence of a demonstrable intraaxial lesion.

Brain Neoplasms↗
PubMed1998

Teleradiology: experiences with magnetic resonance imaging using this new technology.

Teleradiology, a term encompassing electronic transmission of images for interpretation, is becoming an important part of telemedicine. Telemedicine is an exciting new electronic means of distributing specific medical knowledge by computer network. Teleradiology allows healthcare providers in locations that previously might not have had this service to access the use of radiology specialists and subspecialists. The combination of more efficiency in interpretation and the availability of high-quality imaging equipment to rural areas will be even more important in the future. The current concepts of teleradiology are discussed, as well as the findings of the authors' investigation of accuracy and agreement of interpretations of magnetic resonance imaging examinations.

Brain Diseases↗
PubMed1995

Desmoplastic infantile ganglioglioma: CT and MRI features.

We present three cases of desmoplastic infantile ganglioglioma in patients admitted to our institution in the past 8 years. CT and MR findings are discussed. Typically, these lesions are located in the frontal and parietal lobes, appearing as cystic tumors with a solid cortical component within the cerebrum, which enhances intensely, and moderate surrounding edema.

Brain Neoplasms↗
PubMed1994

Posttraumatic cutaneous meningioma of the face.

We present the CT and MR features of a posttraumatic cutaneous meningioma of the face. We postulate that the patient's trauma and associated skull fracture resulted in a trapping of extracranial meningeal tissue, which many years later gave rise to a secondary facial meningioma.

Aged↗
PubMed1993

Magnetic resonance angiography.

OBJECTIVE: To outline the physical principles of magnetic resonance angiography (MRA), major current MRA techniques, clinical indications and some of the limitations of MRA. The rapidly changing nature of MRA techniques is stressed. DATA SOURCES AND DATA EXTRACTION: The MRA literature for the last eight years is reviewed with particular attention to the changing clinical role of MRA. Details of specific MRA techniques are omitted for simplicity and because of their lack of direct relevance to the clinicians requesting MRA examinations. Data concerning the clinical role of MRA techniques are extracted from the literature and combined with our own clinical experience. DATA SYNTHESIS: While stressing the rapidly changing nature of this new investigational technique, we find that MRA has a number of current roles in patient management. CONCLUSIONS: MRA is currently a useful investigation and will in all likelihood become more useful in the future as the technique improves further and becomes more available.

Angiography↗
PubMed1991

Magnetic resonance imaging of acute symptomatic Schmorl's node formation.

The intraspongious herniation of intervertebral disk material into the endplate of a vertebral body was first described by Schmorl in 1927. Any process which weakens the cartilaginous endplate or the subchondral cancellous bone may predispose to the development of Schmorl's nodes. These include Scheuermann's disease, infection, metabolic disorders, neoplastic disorders, and degenerative disease. In the young individual, however, trauma may precipitate an acute focal and symptomatic endplate herniation by the well-hydrated and delineated nucleus pulposus. Magnetic resonance imaging (MRI) is the most sensitive imaging method for the detection of intervertebral disk disease and, thus, has facilitated the diagnosis of traumatic Schmorl's nodes. MRI was very helpful in diagnosing an acute, traumatic, symptomatic Schmorl's node when plain film radiographs and nuclear medicine bone scan were unremarkable.

Adolescent↗
PubMed1990

Streaming hypointensity in hemorrhagic glioblastoma multiforme. An illustrative case.

The computed tomography, the magnetic resonance and the angiographic features of a patient with the unusual findings of multicentric intraparenchymal, subependymal and intraventricular hemorrhage in association with glioblastoma multiforme are presented. The utility of MR in demonstrating an irregular, streaming pattern of hypointensity within the lesion (and thereby suggesting an underlying neoplasm) is briefly discussed.

Brain↗
PubMed1989

Spinal cord compression in type I Gaucher disease.

Three patients with epidural compression of the spinal cord, a rare but serious complication of type I Gaucher disease, are described. In two cases the compression occurred at the lower thoracic region due to collapse of T-11 and T-12, respectively. In the third case, an epidural mass developed at the dorsal aspect of the cord at T-2, and T-2 and T-3 showed diffuse infiltration without collapse. In two cases the diagnosis was made with magnetic resonance (MR) imaging. In these cases MR imaging proved to be a safe, accurate method for demonstrating the nature and extent of disease within the spinal canal.

Adult↗
PubMedDate not supplied

Schizencephaly: case report of familial incidence.

Two half-siblings with schizencephaly are presented. They have the same mother who had a normal cerebral imaging study. Only one other kindred was found in which 2 siblings had this cerebral lesion. In the present patients, autosomal inheritance from the mother is possible, but other explanations should include familial, as well as genetic, factors. Family counseling should stress the sporadic nature of this entity but a recurrence in the same sibship is possible. Details of the clinical and magnetic resonance imaging studies are presented.

Adolescent↗