Patients (15) with a suspected abdominal abscess were examined by both 67Ga and computed tomographic [CT] scanning. The 67Ga scan was a useful screening examination, correctly identifying all 8 cases of infection, whereas the CT scan missed 1 case of a pericecal phlegmon. Misdiagnosis of infection by 67Ga scan occurred in 2/8 cases without infection but the CT scan correctly identified all noninfected patients. While this series is too small to decide whether there is any significant difference in the ability of the 2 procedures to suggest the correct diagnosis, 67Ga and subsequent CT scans may be complementary in that 67Ga scan can initially locate the abnormality and thus direct the CT scan, which can confirm the diagnosis or avoid a misinterpretation of the 67Ga scan. CT also provides more anatomical detail, better location of the lesion and demonstrates lesions noninfectious in nature.