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Biomedical subjects

R F Carmody

Publications and source records attributed to R F Carmody.

At least 37 records · Page 2Linked to original sources
PubMed1984

Digital subtraction angiography in head and neck radiology.

Intravenous digital subtraction angiography (IVDSA) was used to evaluate 44 patients with suspected otolaryngologic abnormalities. Sixteen had IVDSA for pulsatile tinnitus or suspected glomus tumor of the petrous bone. Nine patients were evaluated because of pulsatile neck masses, and 12 others had suspected tumors of the neck, face, and paranasal sinuses. Seven had IVDSA following head and neck trauma. The technique of examination is described. The current indications of IVDSA in head and neck radiology are discussed. It is concluded that IVDSA is a suitable substitute for conventional angiography for many otolaryngologic conditions and, because of its safety, can be used more liberally.

Adult↗
PubMed1984

Foreign body pulmonary embolism originating from a gunshot wound to the head.

Foreign body pulmonary emboli from a cranial venous sinus are unusual. Two patients are presented with gunshot wounds to the head who subsequently developed foreign body pulmonary emboli. Neither had any pulmonary complaints at presentation or during followup. Radiologists and primary care physicians should be aware of the possibility of distal missile pulmonary emboli when a foreign body enters the peripheral venous system or an intracranial venous sinus.

Adult↗
PubMed1984

Intravenous digital subtraction angiography of the nearly occluded internal carotid artery.

Three patients with nearly occluded internal carotid artery origins were evaluated with intravenous digital subtraction angiography and subsequently had successful carotid endarterectomies. The angiographic features are described. Although conventional arterial angiography offers superior spatial resolution and selectivity, the thorough mixing of blood and contrast medium that occurs with the intravenous technique minimizes the tendency toward layering beyond a high-grade stenosis, which may occur with selective arterial injection. In cooperative patients, the intravenous digital technique may be sufficiently reliable in the detection of the nearly occluded internal carotid artery to obviate conventional selective common carotid angiography.

Aged↗
PubMed1984

Radiologic evaluation of the carotid arteries.

In recent years the radiologist has been faced with a host of new imaging modalities which provide structural as well as physiologic information about the carotid arteries. Although conventional intra-arterial angiography is considered the standard of comparison for precise anatomic definition of the cervical and intracranial carotid arteries, it is being replaced in many instances by other techniques. CT scanning may provide valuable information regarding the relationship of the carotid arteries to soft tissue structures in the neck, and dynamic CT scanning has been used to measure cerebral blood flow. Other noninvasive techniques, such as B-mode scanning and Doppler imaging and spectral analysis, can provide accurate information about carotid stenoses and occlusions, although mostly limited to the region of the common carotid bifurcation. The recent development of digital subtraction intravenous angiography provides a revolutionary new and safe way to evaluate the entire carotid arteries, from their origins to their intracranial branches. The advantages and disadvantages, as well as the current roles of these modalities in the radiologic evaluation of the carotid arteries, will be discussed.

Adolescent↗
PubMed1984

Intracranial applications of digital subtraction angiography.

Digital subtraction angiography (DSA) is becoming an important method of studying the intracranial vascular structures. In patients being evaluated for cervicocerebral atherosclerosis, patency of and flow patterns in the major intracranial arteries can be determined. Quantitative as well as qualitative data on relative hemispheric contrast transit times are obtainable. Intracranial aneurysms and vascular malformations can be demonstrated by intravenous DSA, but this technique is unlikely to replace selective intraarterial catheter angiography for the definitive work-up of these conditions. In selected cases, vascular tumors of the intracranial compartment and skull base can be satisfactorily evaluated by intravenous DSA, particularly if precise and intricate anatomic detail is not required. The dural venous sinuses are optimally demonstrated by this modality. Postoperative intravenous DSA is useful for determining the results of surgical treatment of certain conditions, and is suitable for assessing the patency of surgical bypass grafts. The disadvantages of using intravenous DSA for intracranial studies include poorer spatial resolution as compared to conventional angiography, superimposition of vessels, and serious degradation of image quality by patient motion. When greater selectivity and better resolution are required, intraarterial DSA can be performed. Advantages of intraarterial DSA over conventional angiography include the availability of immediate subtraction images, the ability to use dilute concentrations of contrast agent, and lesser film cost. Intraarterial DSA shortens procedure time when therapeutic embolization is performed.

Brain Neoplasms↗
PubMed1983

Giant cell tumor of the sphenoid bone.

A case of giant cell tumor of the sphenoid bone is reported, the first case in which a computed tomogram is available. The radiologic features of the neoplasm resembled both pituitary adenoma and parasellar meningioma, but with more bone destruction. It is appropriate to consider this lesion in the differential diagnosis of a parasellar mass in a teenage or young adult patient when extensive bone destruction is present.

Adolescent↗
PubMed1983

Comparison of iohexol with meglumine-Na diatrizoate for intravenous digital subtraction angiography.

Iohexol, a new non-ionic water-soluble contrast medium, was tested for digital intravenous angiography of the cervical and intracranial vessels. In a double blind study involving 40 adult patients, iohexol and meglumine-Na diatrizoate were compared for safety, patient tolerance, and radiographic image quality. Iohexol was shown to be safe and generally produced less patient discomfort, leading to a lower incidence of motion, swallowing or cough artifacts.

Adult↗
PubMed1982

Intracranial applications of digital intravenous subtraction angiography.

The intracranial vessels of 175 patients were examined with digital intravenous subtraction angiography. The equipment and the technique of the examination are briefly described. Of these patients, 129 underwent intravenous cerebral angiography in conjunction with examination of the extracranial carotid arteries for suspected arteriosclerotic disease. Postoperative and occasionally preoperative studies of intracranial aneurysms and arteriovenous malformations were performed in 16 patients, patency and flow patterns of extracranial-to-intracranial bypass grafts were evaluated in 11 instances, and selected vascular cranial and intracranial neoplasms were studied in 16 cases. Venous sinus occlusion has also been diagnosed by this technique. In many instances, digital intravenous subtraction angiography can replace conventional cerebral angiography.

Adult↗
PubMed1982

Digital video subtraction angiography of the cervical and cerebral vasculature.

A digital video subtraction angiography unit developed at the University of Arizona is described. The system allows the angiographic evaluation of the cervical and cerebral vasculature by means of intravenous injection of contrast material. The procedure is performed on outpatients and is reliable, safe, and economical. The authors have evaluated suspected arterial and venous occlusive disease, certain aneurysms and tumors, and postoperative results of vascular bypass procedures and aneurysm clipping. The clinical application of the technique is shown with appropriate case presentations.

Aged↗
PubMedDate not supplied

Digital subtraction angiography: applications in otolaryngology--head and neck surgery.

Digital electronic technology has made its most notable contribution to radiology in the form of the CT scanners which have so greatly benefited medical practice. Experience with intravenous angiography using a digital fluoroscopy unit developed at the University of Arizona gives promise of a further major benefit in the area of angiography. The majority of examinations are conducted on an outpatient basis with a risk level comparable to that of an intravenous pyelogram. The authors review their experience with this unit, including it's diagnostic and therapeutic applications to congenital and acquired vascular diseases, neoplasms, and vascular trauma of the head and neck.

Adolescent↗
PubMedDate not supplied

Computed tomography in hematologic malignancies of paranasal sinuses.

Hematologic malignancies of the paranasal sinuses are uncommon. Four young patients with ophthalmologic abnormalities as a chief complaint are presented. Lymphoma or leukemia should be considered in the differential diagnosis of destructive lesions in the paranasal sinuses, particularly in children and young adults.

Adult↗
PubMedDate not supplied

High-dose i.v. contrast in CT scanning of the postoperative lumbar spine.

Evaluation of the postoperative lumbar spine is sometimes difficult because of obliteration of epidural fat by hypertrophic scarring. We examined 70 patients using a high-dose intravenous contrast technique in an attempt to distinguish hypertrophic scarring from herniated disk. The CT interpretation was confirmed in all 17 patients who had follow-up operations. Thirteen had herniated disk material associated with scar and four had hypertrophic scarring only. The latter four patients underwent reoperation because of concomitant foraminal or spinal canal stenosis seen on CT. Twelve of the herniated disks had the expected appearance of a nonenhancing mass surrounded by a rim of enhancing scar tissue. In the 13th patient, homogeneous enhancement of the herniated disk was seen. It is thought that chronically herniated disks, such as this one, may incite enough surrounding scar to give the CT appearance of an enhancing disk. Finally, marginal enhancement in the anulus fibrosus region was seen in over 90% of disk spaces examined. Although an anatomical explanation cannot be given at present, this phenomenon is thought to represent a normal finding.

Adult↗