Biomedical subjects
Publications and source records attributed to M I Steinhardt.
We report the third case of renal hemangiopericytoma associated with spontaneous hypoglycemia. The clinical and pathological features suggest that excessive glucose storage by the tumor is an important factor in the pathogenesis of the hypoglycemia. Other possible mechanisms producing hypoglycemia associated with mesenchymal tumors are reviewed.
Twenty-seven patients underwent percutaneous antegrade biliary drainage for obstructive jaundice. The serum bilirubin levels was elevated in all patients. Generalized pruritus was a major complaint. Twenty of the patients had had a laparotomy for malignant disease. Of the 24 patients in whom this method of drainage was successful, the obstructing lesion was found at the porta hepatis in 12 and in the extrahepatic bile ducts in 12. Metastatic disease was the commonest cause of obstruction. Following drainage the serum bilirubin level fell from a mean of 21.4 mg/dl (366 mumol/l) to a mean of 4.1 mg/dl (70.1 mumol/l) within a week. Pruritus was relieved. The major complications were transient cholangitis in five patients and inadvertent dislodgement of the catheter in four. In three of these patients another catheter was reinserted with ease. There was no peritonitis or uncontrolled bleeding. Twenty-one patients were able to leave hospital. Their mean survival time was 7.3 months. A multiperforated catheter manipulated through the obstruction has the advantage of permitting bile flow into the duodenum (antegrade) in contrast to external drainage (retrograde) by T- or U-tubes. Although the mean survival time with this method is similar to that with insertion of drainage tubes at the time of laparotomy, morbidity and mortality are reduced; this is important in view of the poor prognosis of bile duct obstruction due to malignant disease.
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Conventional radiography is now complemented by a large range of newer radiologic diagnostic techniques, involving both roentgenographic and non-roentgenographic modalities. It is the purpose of this presentation to present these new roentgenographic modalities in graphic form, and demonstrate their application to otolaryngic diagnosis. The major roentgenographic modalities which will be stressed are: xeroradiography, angiography, and computerized tomographic scanning.
Newer forms of radiologic diagnostic imaging now include non-roentgenographic modalities such as ultrasound, nuclear medicin, and thermography, all of which can be applied to otolaryngology. It is the purpose of this presentation to demonstrate these modalities, and indicate their clinical application, yet in its earliest stages, to otolaryngology.
Xeroradiography is a newer technique of radiologic imaging which provides both a wide recording latitude and the phenomenon of edge enhancement. It is the phenomenon of edge enhancement in particular which allows for excellent imaging of mucous membrane anatomy and abnormalities. The purpose of this presentation is to demonstrate the role of xeroradiography in the assessment of the pediatric larynx and trachea, with particular reference to the evaluation of tracheal stenosis.
Wise head and neck surgeons, for whom parotid gland surgery constitutes a substantial portion of their case load, make full use of the radiologist and cytologist in arriving at a rational pre-operative diagnosis. They utilize the skill of these allied consultants to qualify (by histology) and quantify (by staging) diffuse and mass lesions of the parotid gland (and subjacent parapharyngeal space) in order to evolve an effective surgical, radiation or other treatment plan. They understand the basic principles of diagnostic imaging and apply them to the clinical problem at hand. They minimize diagnostic and intra-operative "surprises", reduce intra-operative and post-operative complications and generally have a more "informed" patient and patient's family. The purpose of this manuscript is to discuss a contemporary role for diagnostic imaging in neoplastic (and other) diseases of the parotid gland and subjacent parapharyngeal space. Not all lesions of the parotid gland require imaging, although a pre-operative clinical photograph, including evidence of facial nerve function, is always welcome. Other lesions may need diagnostic imaging, from simple to complex and sophisticated, depending upon the problem. Properly used, effective and selective diagnostic imaging can improve the surgeon's confidence by providing a more realistic provisional diagnosis and a better pre-operative staging process and treatment plan, thereby avoiding the surgically unexpected and facilitating prognosis.