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Biomedical subjects

J D Coan

Publications and source records attributed to J D Coan.

8 recordsLinked to original sources
PubMed1996

Imaging of superficial soft-tissue infections: sonographic findings in cases of cellulitis and abscess.

The variation in the sonographic appearances of superficial soft-tissue infections probably reflects a continuous process that leads from soft-tissue edema, seen in cellulitis, to a fully developed abscess and that depends on the type of infection or the immune status of the host. We describe the sonographic findings seen in this process and the variable appearance of abscesses, with emphasis on scanning techniques that facilitate the diagnosis of liquefaction.

Abscess↗
PubMed1992

Ultrasound-guided needle biopsy of the breast and other interventional procedures.

The techniques of and indications for ultrasound-guided needle biopsy of nonpalpable breast lesions are described. High-frequency ultrasonography offers several distinct advantages over sterotaxy and is the technique of choice for guiding the drainage of cysts and fluid collections and the biopsy of any solid mass that can be identified on sonograms. Ultrasonography also can be used for localizing such lesions preoperatively.

Biopsy, Needle↗
PubMed1989

Osteosarcoma metastatic to the kidney.

Two clinically silent renal metastatic lesions from primary osteogenic sarcoma were first detected on radionuclide bone scan. A needle biopsy performed under the guidance of abdominal ultrasonography confirmed the diagnosis. Prior to nephrectomy, further definition of the metastatic lesion was attained using enhanced computed tomography. A review of the English literature revealed only six previous cases of metastatic osteosarcoma detected in the kidney prior to autopsy.

Adolescent↗
PubMed1980

Subclavian thrombosis secondary to transvenous pacing wire.

A case of subclavian vein thrombosis documented by angiography was treated with heparinization, elevation, and elastic support of the involved extremity to obtain fixation of the thrombus and allow collateralization to occur. Oral anticoagulation was continued for six weeks. No symptoms of recurrence have been seen after one year of follow-up. Surgical intervention is rarely indicated since the recurrence rate is unacceptable.

Aged↗
PubMed1976

Transfemoral lumbar epidural venography.

Lumbar epidural venography performed in 107 patients with normal or nondiagnostic myelograms resulted in correct preoperative diagnosis in 25 of 27 patients (92%) with herniated disc disease and three of six patients (50%) with nerve root compression without associated disc herniation. Compression or occlusion of an epidural and/or radicular vein at the disc level is the most significant venographic abnormality. Potentially confusing venographic findings such as flow defects, extravertebral veins mimicking epidural veins, and occlusion of radicular veins by the catheter must be recognized to prevent false diagnoses. Lumbar epidural venography is valuable for the diagnoses of herniated lumbar discs not demonstrated by myelography.

Catheterization↗
PubMed1975

The various forms of pulmonary varices. Report of three cases and review of the literature.

Ture pulmonary varices are congenital local dilatations of a pulmonary vein or veins, with normal or collateral transpulmonary drainage into the left atrium. Pulmonary varices do not cause pulmonary venous hypertension, but existing varices can further become dilated by pulmonary venous hypertension due to mitral valve disease. Embryologically, pulmonary varices may represent residual primitive splanchnic venous components incorporated into the pulmonary venous system, or atresia of an individual pulmonary vein which occurred at a time that enable adoption of unobstructed transpulmonary collateral drainage into the left atrium. True pulmonary varices do not produce symptoms, do not change in diameter over the years, and, usually, do not require treatment.

Diagnosis, Differential↗
PubMedDate not supplied

Malignant cardiac fibrous histiocytomas and angiosarcomas: MR features.

Primary tumors of the heart are rare, and one-third of them are malignant. The magnetic resonance (MR) features, their specificity, and significance in two patients with malignant fibrous histiocytoma and three patients with angiosarcoma are presented and the literature briefly reviewed. Malignant fibrous histiocytoma occurred in the left atrium and demonstrated slightly heterogeneous intermediate signal intensity on T1-weighted images and high signal intensity on T2-weighted images. The angiosarcomas involving primarily the right heart were more varied in MR appearance with heterogeneous signals. The extensive angiosarcomas almost circumferentially involving the epicardium and pericardium showed the "cauliflower" appearance with focal areas of increased signal intensity probably related to thrombosis or hemorrhage. Magnetic resonance provided detailed anatomic information and characterization of malignant cardiac tumors.

Adult↗