Tc-99m labeled monoclonal antibodies against granulocytes (BW 250/183) in the detection of appendicitis.

Scintigraphy with Tc-99m labeled antigranulocyte antibodies (BW 250/183 MoABs) was performed in 32 patients with suspected appendicitis. Abdominal imaging (planar/SPECT) was performed 2 hours after injection of the tracer. All patients also had surgery and a histologic examination of the resected tissue. Of the patients, 17 suffered from «acute appendicitis» and 12 had right positive scans (sensitivity=70.6%). In 15 patients, acute appendicitis could have been ruled out, and in 11 of these cases the scan was true negative (specificity=73.3%). The overall accuracy was 71.8% (23/32 cases)