The authors report a case of hepatic mycotic aneurysm following Staphylococcus aureus septicemia and subsequent bacterial endocarditis. The diagnosis was made preoperatively using serial radionuclide imaging and ultrasound and confirmed by angiography and surgery.

The patency of arteriovenous anastomosis (AVA) in the renal microcirculation has been a controversial topic.To study the possibility of AVA as part of the renal microcirculation a catheter was placed under radiological control in a renal artery in each of eight anesthetized dogs.Albumin microspheres 15-52 micra in diameter labeled with 3-5 mCi of Tc99m were injected into the renal artery through this catheter.Counts over the lungs, kidneys and bladder were obtained with detectors. The spatial distribution of the radioactivity in the dogs were also studied by scintigraphy and there was imaging of the kidneys which corroborates the findings obtained with detectors, there was no visualization of the lungs. In some studies the bladder was visualized because of the presence of free Tc99m.The lack of radioactivity in the lungs indicates that there are not patent AVA in canine kidneys because the radioactive microspheres injected in the renal artery became lodged in the arterioles, for being larger than the capillaries they could not cross to the renal veins.

In two cases of tricuspid atresia and one of severe tricuspid stenosis the Glenn and Fontan operation was performed. These patients were evaluated post-operatively by studying the distribution of the ventilation with Xe-133 on a gamma camera; the pulmonary circulation was evaluated by injection through antecubital and pedal veins of TC99mMAA and angiography was performed by "in vivo" tagging of red blood cells with TC99m04 preceded by the administration of stannous pyrophosphate. The scintigraphic findings in two cases consisted of decreased ventilation of the left lung and grossly normal perfusion of both lungs. In one case there was abundant collateral because of partial occlusion of the anastomosis between the superior vena cava and right pulmonary artery. The patients also had angiocardiography with contrast medium; the correlation between the scintigraphic and angiocardiographic findings was excellent.

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