CT of metal implants: reduction of artifacts using an extended CT scale technique.

Purpose: The purpose of this work was to use an extended CT scale technique (ECTS) to reduce artifacts due to metal implants and to optimize CT imaging parameters for metal implants using an experimental model.

Method: Osteotomies were performed in 20 porcine femur specimens. One hundred cobalt-base screws and 24 steel plates were used for osteosynthesis in these specimens.

[Percutaneous therapy of osteoid osteoma].

Osteoid osteomas are tumors with intense clinical symptoms and extensive reactive bone changes far exceeding the volume of the lesion itself. Because of their small size they can be approached by minimally invasive surgical procedures. We treated ten symptomatic patients with osteoid osteomas (n 6 hip point, n 1 iliac bone, n 1 femoral diaphysis, n 2 tibial diaphysis) by excision of the nidus with a 3-mm Harlow-Wood needle using a percutaneous CT-guided approach.

Percutaneous bone biopsy, techniques and indications.

In the first part of this article we discuss some special technical aspects of percutaneous bone biopsy (PBB). But our main intention is to illuminate the critical indication of PBB against the background of the diagnostic and clinical utility. Reliable indications for PBB are: lytic metastases, solitary lytic lesions in a patient with known primary tumour and infection.

Esterase-30 (ES-30) of the house mouse: biochemical characterization and genetics of a new carboxylesterase isozyme linked to cluster-2 loci on chromosome 8.

A new carboxylesterase isozyme (EC 3.1.1.

[Percutaneous bone biopsy. Critical analysis of 153 patients].

The value of transcutaneous bone biopsy was critically examined in a retrospective study of 153 patients with various bone diseases. A comparison of the clinical, radiological and histological findings gave reliable results in approximately 82%. Specific results were worse in inflammatory processes than in those involving tumours.

[Results and assessment of computerized tomography in the initial diagnosis in polytrauma].

In a period from 1984 to 1986 (T-scan was used as acute diagnostic in 74 polytraumatized patients. The patients were brought by emergency car or helicopter during or shortly after shock treatment directly to the computerized tomography. In all patients several regions of the body (head, thorax, abdomen, extremities) were examined in the (T-scan.

[Clinical aspects and radiology of histiocytosis X in the skeleton--a retrospective study of 18 patients].

The present paper presents the clinical and radiological findings from a retrospective study of 18 children suffering from histiocytosis with skeletal involvement (20 lesions) treated between 1971 and 1983. The different forms of manifestation on the skull, vertebral column, and long bones are described and problems of differential diagnosis discussed. Possible forms of therapy are considered.

Identification and development of a genetically closely-linked carboxylesterase family of the mouse liver.

Six carboxylesterase isozymes (viz. ES-1, ES-6, ES-9, ES-20, ES-22 and ES-24), governed by esterase gene cluster 1 on chromosome 8 of the house mouse, were identified electrophoretically in liver supernatants using their biochemical, genetic and developmental characteristics. ES-1 and ES-20 were expressed as liver-specific forms.