Biomedical subjects
K C Davidson
Publications and source records attributed to K C Davidson.
Radiography of hereditary presacral teratoma.
Radiographic findings and related information are described for a series of 26 patients from six unrelated families. The tumor complex consists of a presacral teratoma and a sacrococcygeal bony defect occurring in a familial pattern. Many of the patients also had an associated vesicoureteral reflux, skin dimples, retrorectal abscess, and anorectal stenosis. The main radiographic features were the presence of a unilateral or central developmental deformity of the sacrum and coccyx, and the absence of radiographically visible soft-tissue calcifications.
Carotid atherosclerosis: diverse angiographic patterns and surgical considerations.
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Multiple chronic traumatic pseudoaneurysms of the aorta and great vessels. A case report.
A case of multiple chronic traumatic pseudoaneurysms of the thoracic aorta and major branches in a young girl is presented. Angiograms obtained 2 days, 3 months, and 15 months after injury demonstrated stability of the patients's condition. The necessity for close follow-up in a case not surgically repaired is stressed.
Traumatic vertebral artery pseudoaneurysm following chiropractic manipulation.
A vertebral artery pseudoaneurysm accompanied by serious neurological injury was seen in a 42-year-old woman who had undergone chiropractic manipulation of the neck. Such manipulation is a potential cause of neurological injury due to trauma to the cervical spine and the major vessels of the neck. The arterial pattern in this case was similar to that of angiodysplasia except for narrowing and irregularity of the vertebral artery.
Mucoid impaction of the bronchi. Case reports.
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A simple method for angiography of extracorporeal arteriovenous shunts: "shunt" angiography.
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Unusual renal arteries in a potential kidney donor. Case report.
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The sigmoid elevator sign: it significance.
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An autotomographic device for pneumoencephalography and ventriculography.
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Cranial and intracranial lesions in neurofibromatosis.
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Primitive hypoglossal artery and carotid endarterectomy.
A patient with transient ischemic symptoms in the carotid and vertebrobasilar distribution is reported. His arteriogram demonstrated a persistent primitive hypoglossal artery which in part may explain the clinical picture. The embryology, radiology, clinical manifestations, and surgical considerations of this rare anomaly are discussed.
Comparisons of cutoff and regression-based definitions of reading disabilities.
This study addressed the issue of specificity in reading disability by comparing two approaches to defining and selecting children with reading disabilities. One approach defined reading disability according to cutoff scores representing appropriate levels of intelligence and reading deficiency, whereas the other approach adjusted these scores for their intercorrelation through regression procedures. Results revealed clear differences in which children were identified as reading disabled according to the two definitions. However, differences in neuropsychological performance between children whose reading scores were discrepant or not discrepant with IQ were small and nonspecific for both definitions. The results of this study show that children identified as reading disabled vary according to the definition employed; at this point, there is little evidence suggesting any specificity of reading disability according to definition.