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Biomedical subjects

R H Choplin

Publications and source records attributed to R H Choplin.

45 records · Page 3Linked to original sources
PubMed1982

The chest radiograph in Rocky Mountain spotted fever.

Chest radiographs of 43 patients with Rocky Mountain spotted fever were reviewed to elucidate the frequency and types of involvement of the lower respiratory tract. The abnormal radiographic patterns included localized and diffuse infiltrates of both interstitial and alveolar type. Autopsies were performed in five cases, and findings in several of these are described to help provide radiologic-pathologic correlation. An association of lung involvement (as evidenced by diffuse infiltrates on chest radiographs) and increased mortality was demonstrated.

Cardiomegaly↗
PubMed1982

Malignant fibrous histiocytoma of the mediastinum and lung: a report of three cases.

One case of primary malignant fibrous histiocytoma of the lung and two cases of that tumor in the mediastinum are reported. Primary malignant fibrous histiocytoma is rare in those areas, appearing more commonly in deep fascia and skeletal muscles of the extremities and torso and in the retroperitoneum. Most of the tumors contain both fibroblast-like and histiocyte-like cells; some contain pleomorphic giant cells and inflammatory cells. They are often confused with other sarcomas, and their true biologic potential is not clearly defined. Radiation appears to be a very useful adjunct to surgical therapy and was used in the cases reported here.

Female↗
PubMed1981

Fluoroscopic evaluation of skeletal problems.

Fluoroscopically positioned spot films are widely used in gastrointestinal and chest roentgenography. Little or no mention is made of the diagnostic use of fluoroscopic spot filming for skeletal roentgenography in major tests or recent literature, and a rough survey of practicing radiologists showed us that such procedure was frequently underutilized or not utilized. While skeletal pathology is usually depicted quite accurately by plain radiographs there are times when a problem may be rapidly and simply clarified by fluoroscopically positioned spot films. In an attempt to assess the value of fluoroscopy for evaluation of musculoskeletal problems, we reviewed 46 cases in which fluoroscopically positioned spot films were obtained.

Arthritis↗
PubMed1980

Pulmonary sequestration: six unusual presentations.

In a review of 26 cases of sequestration, six patients with unusual radiographic features are described in detail. Three children had congestive heart failure, and congenital heart disease was suspected. One patient with a cystic upper lobe sequestration was thought to have a pneumatocele or infected cyst. In two other cases the sequestrations had features of a solid mass lesion. One of these was erroneously diagnosed as a mesothelioma or bronchogenic cyst, and the other as a carcinoma.

Adolescent↗
PubMedDate not supplied

Case report. Chemical-shift MRI of exogenous lipoid pneumonia.

Exogenous lipoid pneumonia results from the aspiration or inhalation of fatty substances, such as mineral oil found in laxatives or nasal medications containing liquid paraffin. We present standard and lipid-sensitive (Chemical-shift) MR findings in a patient with histologically confirmed lipoid pneumonia. The loss of signal intensity in an area of airspace disease on opposed-phase imaging was considered specific for the presence of lipid.

Aged↗
PubMedDate not supplied

Case report. Aortic pseudoaneurysm with aortobronchial fistula: diagnosis with CT angiography.

We report the case of an 82-year-old man with a 12-month history of recurrent hemoptysis caused by an aortobronchial fistula. Twenty-five years earlier, the patient underwent placement of an aortic graft for aortic transection sustained in a motor vehicle accident. Chest radiography and bronchoscopy showed nonspecific abnormalities. We emphasize the role of CT angiography with 2D and 3D reconstructions for the diagnosis of and surgical planning for this rare but potentially lethal aortic postoperative complication.

Aged↗
PubMedDate not supplied

Localized benign fibrous tumors of the pleura: MR appearance.

PURPOSE: Our goal is to describe the MR findings in benign localized fibrous tumors of the pleura. METHOD: Chest radiographs, CT scans, and MR images of four patients with localized benign fibrous tumors of the pleura were retrospectively reviewed and correlated with the pathologic findings. RESULTS: Tumors ranged from 4 to 18 cm in their largest diameter. Three tumors were located in the diaphragmatic region, and one was within the left major fissure. All tumors were round to ovoid, pedunculated, and well delineated. On T1-weighted SE MR images, tumors showed low signal intensity. All tumors had heterogeneous but predominantly low signal intensity on proton-density-weighted images and lower signal intensity on T2-weighted images. CONCLUSION: Localized benign fibrous tumors of the pleura were characterized by low signal intensity on all MR sequences that is explained by high collagen content within the tumors' stroma and should suggest the diagnosis preoperatively.

Adult↗
PubMedDate not supplied

Stereotactic localization of breast lesions: how it works and methods to improve accuracy.

A computer simulation of stereotactic breast biopsy was developed that paralleled the geometric configuration of a currently available breast biopsy system. This model was developed to define and improve the targeting of breast lesions with stereotactic biopsy techniques. Lesions must be clearly identified and accurately targeted on both views for successful localization. Nonvisualization of a lesion may result from overlying tissue or from the geometric configuration of the imaging system. Familiarity with the geometric configuration of the biopsy unit, especially the location of the reference point and center of rotation, facilitates understanding of apparent changes in lesion position (parallax shift). Inaccuracy in lesion targeting on one or both views will manifest predominantly as an error in the calculated z value (depth). The magnitude and direction of this error are largely determined by the direction of the targeting error. Compensatory strategies include use of a long-throw core biopsy gun or directional vacuum-assisted biopsy device and additional sampling along the z axis and should be accompanied by critical evaluation of both pre- and postfire images. Understanding geometric considerations as well as how targeting accuracy affects accuracy in lesion localization should lead to greater success in sampling even challenging breast lesions at stereotactic biopsy.

Biopsy, Needle↗