Tortuous azygos arch simulating a pulmonary lesion.
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Biomedical subjects
Publications and source records attributed to E M Druy.
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Five patients with postoperative ureteral fistulae subsequent to surgically created ureteral anastomoses were treated successfully by temporary percutaneous nephroureteral drainage and stenting. Low, constant suction applied to the drainage tubes achieved total urinary diversion, while concomitant ureteral stenting seemed to prevent subsequent stricture formation. The techniques have reduced considerably the morbidity of this particular postoperative complication.
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Interventional radiology now makes possible new diagnostic and therapeutic approaches to many disease processes. Technological advances in catheter design coupled with newer imaging modalities, eg, ultrasound and computed tomography, make it feasible for the interventional radiologist to gain access to virtually any structure within the body via a percutaneous approach. Disease states can be modified and in some cases definitively corrected by the transcatheter delivery of various pharmacologic or inert agents. Precise localization of abdominal and retroperitoneal masses allows for the safe and accurate percutaneous aspiration biopsy of deep-seated lesions. The use of the skills of the interventional radiologist can speed the diagnostic evaluation of many cases, may eliminate the need for exploratory laparotomy, and may offer new therapeutic approaches where previously there was little or no hope for therapeutic success.
The suprarenal fossa has been a clinically silent area of the body where nonfunctional lesions of soccer ball size could go undetected until they disturbed functions of adjacent organs. Unless an adrenal tumor was suspected by biochemical or clinical screening information, early diagnosis was an exception, and localization usually required invasive techniques. With the advent of noninvasive computer-assisted radiologic and sonographic techniques, surgeons now have the reverse problem of early diagnosis of asymptomatic adrenal mass: do we need to know about nonfunctioning "incidentalomas" and what further action is compelled by their discovery? Sophisticated adrenal imaging techniques, even if noninvasive, should be be utilized as a localizing technique after the biochemical determination of adrenal disease is established. Localization should not precede the biochemical confirmation of endocrine active adrenal disease. For adrenal masses discovered in asymptomatic patients, predictability of curative adrenal surgery is only as good as the strength of the causal link between the clinical evidence of adrenal disease and the localizing information; thus the indication for operation does not rely solely upon the resolving power of adrenal imaging to demonstrate adrenal masses. This causal link is not strengthened by one radiographic test that confirms the results of another in the absence of evidence that adds functional significance to the radiographic findings. For the "incidentaloma" of the adrenal that might represent neoplasm, techniques similar to those employed for thyroid masses should be used for diagnosis rather than the routine prescription of operation based on the mere presence of a space-occupying lesion. Direct correlation of imaging studies applied to prior patient findings is necessary before operation is indicated for adrenal "incidentalomas."
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Computerized tomographic studies of normal canine anatomy were obtained, using a whole body scanner. The regions of interest were head and neck, thorax, and abdomen and pelvis. Scans were compared with gross transverse sections from one euthanatized dog. Identification and labeling of anatomic structures were aided by reference to recognized texts of canine anatomy.
The diagnostically useful computed tomography (CT) findings in five new cases of inferior vena cava thrombosis are reported. These findings include: (a) inhomogeneous density of the inferior vena cava, usually best demonstrated after contrast medium injection; (b) caval density less than aortic density; (c) rim enhancement which may be seen with both caval thrombosis and tumor invasion; and (d) enlargement of the vena cava if accompanied by at least one or more of the above findings. A bolus injection of contrast medium followed immediately by CT helps to make some of the above described findings more prominent. In selected patients, this injection should be made into the femoral vein.
Four patients with blunt abdominal trauma underwent computed tomography (CT) as part of their diagnostic evaluation. In each case CT accurately demonstrated the pathology and the extent of injury. The results suggest that routine use of CT scanning may be an effective screening modality in the traumatized patient. It is perhaps more specific than radioisotope scanning and may eventually reduce the need for invasive techniques such as angiography.
The authors encountered a patient with an indwelling central venous catheter who presented with pulmonary edema after the catheter hub was disconnected. Pulmonary arteriography demonstrated diffuse peripheral vasoconstriction, decreased arterial-to-venous transit time, and arterial occlusions. The former two findings allowed the authors to prospectively suggest the diagnosis of pulmonary air embolism.
Transluminal angioplasty of the common carotid artery was beneficial in a patient with postendarterectomy recurrent stenosis due to fibrous myointimal hyperplasia. This lesion is the major cause of restenosis within the first 24 postoperative months and has histologic characteristics quite favorable for angioplasty with minimal possibility for embolic complications. Since surgery is a proven procedure with low morbidity/mortality for most patients, the authors believe transluminal angioplasty for carotid restenosis should be limited to surgically inaccessible lesions or patients presenting unacceptable operative risk, as in the case described.