Radiology, Vol 158, 761-763, Copyright © 1986 by Radiological Society of North America
Indium-111 labeled leukocyte uptake: false-positive results in noninfected pseudoaneurysms
BR Gilbert, MD Cerqueira, HW Vea and WB Nelp
Indium-111 (In-111) leukocyte scintigraphy was performed in two patients
with postsurgical pseudoaneurysms as part of preoperative evaluation for
evidence of graft infection. Despite positive In-111 uptake by the
pseudoaneurysms, surgical and pathologic examinations failed to reveal any
evidence of infection. The most likely explanation for the false-positive
results is the labeling of "contaminating" platelets and erythrocytes in
the leukocyte mixture. Caution must be exercised in interpretation of
In-111 leukocyte scans in patients with postsurgical pseudoaneurysms.
