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Biomedical subjects

J Tehranzadeh

Publications and source records attributed to J Tehranzadeh.

At least 55 records · Page 3Linked to original sources
PubMed1986

Ewing's sarcoma and pregnancy. A case report and review of the literature.

This is the fifth reported case of Ewing's sarcoma in pregnancy. Ewing's sarcoma seems to progress rapidly during pregnancy. Treatment should consist of therapeutic abortion followed by chemotherapy, radiation therapy, and surgery if discovered early in pregnancy. Controversy exists as to the treatment late in pregnancy. Chemotherapy during pregnancy has been suggested, but most authors think all consideration should be given to the fetus. Since maternal prognosis is so poor, the fetus should be taken by cesarean section as soon as pulmonary maturity can be documented by amniocentesis. The mother can then be treated appropriately.

Adult↗
PubMed1984

Intra-articular calcified bodies: detection by computed arthrotomography.

We used computed tomography (CT) in six cases to detect and localize intra-articular calcified bodies after double-contrast arthrography and pneumoarthrography . The cases consisted of one wrist, three ankles, and two knees. In one knee, one wrist, and two ankles, CT scanning after double-contrast arthrogram or air arthrogram accurately diagnosed and localized the intra-articular nature of the calcified bodies. In one knee and one ankle, the use of this technique accurately ruled out false-positive loose bodies suspected on the double-contrast arthrograms. Computed tomography after air arthrography or double-contrast arthrography is a simple and accurate technique to detect, localize, or exclude calcified bodies in the joints, and it is a useful adjunct when conventional tomography is inconclusive.

Adult↗
PubMed1984

The prone position for CT of the lumbar spine.

In scanning the L5-S1 disk space, the known technical difficulty is limitation of the gantry angle. A prone scanning technique used to examine the lumbar spine may help to overcome or lessen this problem. A prospective CT scanning of the L5-S1 level was performed in both the prone and supine positions on 25 patients who had low back pain and who had not undergone previous laminectomy or fusion. The angle between the S1 vertebral end plate and maximum tilted gantry line (15 degrees on the G.E. 8800) was measured in the supine position and compared with the same angle in the prone position. In 20 of 25 cases (80%), significant improvement in alignment was noted in the prone position. The prone scanning technique is also more desirable if CT is performed with metrizamide. Finally, printed images from the prone technique allow easier image-patient orientation for viewing in the operating room.

Back Pain↗
PubMed1983

Closed skeletal needle biopsy: review of 120 cases.

A review of 120 percutaneous bone biopsies performed on 110 patients in the Radiology Department of the Hospital for Special Surgery showed a 72% concurrence of biopsy findings with the patient's other clinical findings and subsequent course. Of the biopsies, 58% were correctly positive for malignancy or infection and 14% were correctly negative. The rest, 28% of the biopsies, were either incorrectly negative or had insufficient tissue for diagnosis and were therefore unsatisfactory. Only eight positive cultures from biopsy material were obtained in 21 cases with bone infections. In diagnosing metastasis, a higher success rate (84%) was noted in vertebral biopsies than other sites (66%). Poor success (44%) was noted, however, in biopsying primary bone neoplasm.

Adult↗
PubMed1981

Radiological evaluation of painful total hip replacement.

Ninety-four cases of clinically failed, cemented, total hip prostheses requiring surgery were reviewed to determine the accuracy of preoperative plain radiography, culture of aspirated fluid, arthrography, and bone scanning. When radiopaque cement had been used to embed the prosthesis, plain radiography was highly accurate in detecting a loose femoral component, less so in detecting a loose acetabular component. Culture of aspirated fluid was accurate in diagnosing infection. A positive arthrogram identified loosening with good accuracy; however, a negative arthrogram did not reliably exclude loosening. 99mTc bone scans frequently differentiated loosening from loosening with infection. The suggested sequence of diagnostic tests is plain radiography followed by bone scanning. If the bone scan shows diffuse augmented uptake, culture of aspirated fluid followed by arthrography is indicated.

Bone Cements↗
PubMed1979

The differential density sign of pericardial effusion.

Chest radiographs of 100 patients with suspected pericardial effusion who underwent echocardiography were reviewed. Fifty were echo-positive and 50 were negative. The differential density sign was present in 34 patients (68%) who were echo-positive and 2 patients (4%) who were negative; on frontal (62%) and lateral (41%) projections; and in patients with small, moderate, and large effusions. Computed tomographic findings in 1 patient correlated closely with those obtained radiographically. Experimental models suggest this sign is related to different tissue attenuation coefficients for blood and saline, different tissue thicknesses of the spherically shaped heart, the presence of epicardial fat around the heart, and chest film exposure factors. "Trapping" of the middle lobe or anterior lingula may also contribute. When pericardial effusion is not suspected, the presence of this sign should be an indication for echocardiography.

Adolescent↗
PubMedDate not supplied

Giant cell tumor of the proximal tibia: MR and CT appearance.

The magnetic resonance (MR) appearance of four cases of giant cell tumor (GCT) of the proximal tibia are described and the MR grading of these tumors is compared with CT and conventional radiography. Magnetic resonance showed the lesions to be well defined with respect to adjacent marrow and cortical bone. Homogeneous intermediate signal intensity or low signal within the tumors was seen on T1-weighted images. T2-weighted images showed mixed signal intensity with small "bright patches" of increased signal intensity in all four cases. No fluid levels were identified. Magnetic resonance was superior to CT and plain radiography in radiologic grading of the tumors. Computed tomography was superior in determining if cortical invasion was present. Intraarticular tumor extension was more accurately detected by MR and arthrotomography than CT. An MR manifestation of GCT of the proximal tibia is described which may be a common appearance of this tumor by this modality. Magnetic resonance is the procedure of choice in the radiologic grading of GCT.

Adult↗