Richard B Lawdahl

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The diagnosis of acute cholecystitis in critically ill patients carries a high mortality rate. Although decompression and drainage of the gallbladder through a cholecystostomy tube may be used as a temporary treatment of acute cholecystitis in this population, there is still some debate about the management of the tube and the subsequent need for a(More)
Numerous eyeglass lens materials have been recommended for protection of radiologists' eyes from the cataractogenic effect of radiation during fluoroscopic procedures. For the most part, these lenses coincidentally attenuate x-ray beams because they contain elements of high atomic number that are added to increase refractive index. With a bean hardened to(More)
Angiography was performed in a 70-year-old man because of a recurrence of massive hemochezia. The angiogram demonstrated a third mesenteric artery, arising from the aorta between the superior and inferior mesenteric arteries and supplying the splenic flexure. Although many variations of colonic arterial supply have been described, those involving vessels(More)
Meckel's diverticula were detected by mesenteric angiography in 2 patients with unexplained gastrointestinal bleeding following negative barium, endoscopic, and scintigraphic evaluation. Abnormal, irregular, arterial branches supplied by an elongated, nonbranching ileal artery and an associated capillary stain were present in each case. Since neither(More)
Diagnostic angiography performed to search for a source of hemorrhage in three patients with percutaneous transhepatic biliary catheters and one patient with a percutaneous nephrostomy catheter was initially unrewarding when performed with the drainage catheter in place. In each patient, removal of the drainage catheter resulted in severe pulsatile(More)
Arteriovenous fistulas (AVFs) and arteriovenous malformations (AVMs) may be difficult to differentiate angiographically, and this differentiation has important therapeutic implications. In five cases of chronic AVF, four originally misdiagnosed as AVMs, superselective angiography enabled the correct diagnosis. In two plantar arch fistulas, the technique was(More)
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