Abstract
A prosthetic axillo-femoral bypass graft was visualized during 111In-labeled leukocyte scintigraphy in a patient referred for possible abdominal abscess. The presence of significant cardiac blood-pool activity raised the possibility that this uptake was due to deposition of contaminating labeled platelets rather than labeled leukocytes. An analysis of a small sample of the patient’s blood confirmed that the circulating activity was due to labeled platelets. Increased activity along prosthetic vascular grafts in patients undergoing 111In-labeled leukocyte scintigraphy may be due to adherent platelets and not indicative of infection.