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Biomedical subjects

R M Quencer

Publications and source records attributed to R M Quencer.

At least 127 records · Page 7Linked to original sources
PubMed1980

Extracranial complications of cerebrospinal fluid shunt function in childhood hydrocephalus.

There were 112 separate hospital evaluations in 84 patients for suspected shunt malfunction: 96 evaluations were of ventriculoperitoneal shunts, 13 were of ventriculoatrial shunts, and three were of both types of shunts. In 45 (47%) of 96 ventriculoperitoneal shunts, complications eventually led to surgical revision; 20 (44%) of these were problems of the peritoneal end and therefore peculiar to this type of shunt. Peritoneal end problems included tubing disconnection, bowel obstruction, perforation, and abdominal cerebrospinal fluid pseudocyst. Of the 13 ventriculoatrial shunts, 10 (79%) required revision; eight (61%) of these were due to problems of the atrial end. These problems included relative shortening of the tubing due to patient growth, superior vena cava thrombosis, and disconnection. Ventriculoperitoneal shunts were used most frequently and had a lower complication rate (47%). Ventriculoatrial shunts were used less often and had a higher complication rate (79%) and more serious problems.

Cerebrospinal Fluid Shunts↗
PubMed1980

CSF rhinorrhea from a transclival meningocele demonstrated with metrizamide CT cisternography. Case report.

A 63-year-old woman with a 10-year history of intermittent cerebrospinal fluid (CSF) rhinorrhea was found to have a transclival meningocele. After pluridirectional tomography demonstrated a bone defect in the clivus, the diagnosis was established by means of computerized tomography (CT) by comparing the absorption coefficients of a soft-tissue mass within the sphenoid sinus before and after the injection of metrizamide into the lumbar subarachnoid space. An increase of 39 absorption units clearly indicated the movement of CSF from the prepontine subarachnoid space into the sphenoid sinus. This case illustrates the value of metrizamide CT cisternography in the evaluation of patients with CSF rhinorrhea.

Cerebrospinal Fluid Rhinorrhea↗
PubMed1979

Transient bilateral occipital lobe ischemia: microembolization through a trigeminal artery.

Microembolization from an ulcerated carotid artery to both occipital lobes via a persistent trigeminal artery was observed in a patient presenting with episodic bilateral central scotomata. Symptomatic relief was obtained following carotid endarterectomy. This unique pathway which resulted in occipital lobe ischemia has not been previously reported.

Carotid Artery, Internal↗
PubMed1979

Cerebrospinal fluid shunt function and hydrocephalus in the pediatric age group: a radiographic/clinical correlation.

Eighty-four pediatric patients were evaluated clinically and radiographically on 112 separate admissions for suspected increased intracranial pressure and possible shunt malfunction. The shunt system was tested clinically in each patient and correlated with the ventricular size as determined by CT. Of the patients with enlarged ventricles, 87% had an improperly functioning shunt and 13% had a normally functioning shunt. Of the patients with normal or small ventricles, 93% had a normally functioning shunt. Thus the "false negative" rate was 4% (small ventricles with a nonfunctioning shunt) and the "false positive" rate was 13% (large ventricles with a functioning shunt).

Adolescent↗
PubMed1979

Lateral decubitus pneumoencephalography-angiography for localizing atrial and paraatrial vascular lesions.

In two cases where computed tomography (CT) and cerebral angiography failed to determine whether an arteriovenous malformation was within or directly adjacent to the atrium of a lateral ventricle, lateral decubitus pneumoencephalography combined with cerebral angiography successfully localized the lesions. This procedure may be necessary in the workup of angiographically vascular lesions in the atrial-paraatrial region if on CT the ventricular surface is poorly defined or surgical clips from a previous operation obscure the lesion or the adjacent ventricle. Interpretation of this study involves triangulation of the vascular lesions relative to the ventricle or observation of the movement of the lesion relative to the movement of the ventricle on differently angulated frontal projections. Since the surgical approach is influenced by the radiographic differentiation of an intraventricular from a paraventricular mass, this procedure is crucial in evaluating these vascular abnormalities.

Adult↗
PubMed1979

Malignant external otitis: a radiographic-clinical correlation.

Malignant external otitis is an infectious process of the ear which may cause marked destruction of the surrounding bony structures. After evaluation of the plain skull films, mastoid series, temporal bone tomography, arteriography, and venography in nine cases of malignant external otitis, we divided the disorder into an early stage and late stage. The early stage is manifested by a soft tissue mass within the external canal or clouding of the mastoid air cells with no bone destruction. In the late stage, bone destruction may extend to the middle ear cavity, temporomandibular joint, and/or base of the skull. A correlation can be made between the clinical findings and these radiographic stages. Complex motion tomography is essential to appreciate the bone destruction in patients with late stage disease.

Aged↗
PubMed1978

Postoperative bony stenosis of the lumbar spinal canal: evaluation of 164 symptomatic patients with axial radiography.

Computed tomography (CT) and transverse axial tomography (TAT) were used to study the lumbar spines of 164 patients with persistent or recurrent low back pain and/or radiculopathy. Of those patients with previous spinal fusion and of those with previous disectomy, 43% and 28%, respectively, demonstrated bony stenosis of the lumbar spinal canal. Of the patients who underwent surgery for this narrowed canal, 91% showed clinical improvement.

Adult↗
PubMed1977

Normal ocular circulation and the effect of arterial occlusive disorders.

Arterial occlusive disease, either primary or secondary, may not only affect the appearance of the ophthalmic artery, posterior ciliary arteries, and choroid crescent, but may be reflected in the prolongation of the circulation time to the choroid crescent. Choroid circulation time determined in 80 normal carotid angiograms showed that a value greater than 4.5 sec. for a population under 30 years of age, and greater than 5.6 sec. for a population 30 years of age and older, is prolonged. One should view these studies with suspicion and search for intra-orbital, intracranial, or extracranial arterial occlusive disease.

Adult↗
PubMed1977

The postoperative myelogram. Radiographic evaluation of arachnoiditis and dural/arachnoidal tears.

Either arachnoriditis or dural/arachnoidal tears may cause symptoms in the postoperative spinal patient. Surgery and myelography as causes of arachnoiditis are discussed. Intradural arachnoid cyst formation and intramedullary cavitation may present as unusual sequelae of arachnoiditis. Extra-dural cysts and cerebrospinal fluid fistulas resulting from dural/arachnoidal tears are unusual postoperative complications presenting striking myelographic features. Their mechanisms of formation, clinical significance, and radiographic features are discussed.

Animals↗
PubMed1977

Aneurysm of the azygos artery.

A saccular aneurysm of the azygos artery is reported. The relationship between (a) this aneurysm and the primitive vessel from which it arises and (b) the aneurysms which are frequently seen involving persistent carotid-basilar anastomoses is described.

Adult↗
PubMed1976

Intracranial ectopic pituitary adenoma. Case report.

The authors report a unique case of ectopic intracranial pituitary adenoma, associated clinically with generalized seizures and aggressive behavior. The lesion presumably arose from cells in the pars tuberalis and did not involve the sella turcica.

Adenoma, Chromophobe↗