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AIM: We evaluated the usefulness of planar scintimammography (SM) with a high resolution dedicated breast camera (DBC) in comparison with single photon emission computed tomography (SPECT)/computed tomography (CT) in primary breast cancer detection. METHODS: A consecutive series of 157 patients with breast lesions suspicious for cancer at conventional diagnostic procedures were studied with both DBC planar SM and SPECT/CT using [99mTc] tetrofosmin as radiotracer. Scintigraphic data have been related with definitive histopathological findings in all cases. RESULTS: Breast cancer was ascertained in 127/157 patients and benign disease in the remaining 30 cases, with a total of 140 carcinomas and 33 benign lesions. DBC planar SM detected 95.7% of overall carcinomas, while SPECT/CT 90.7%(P< 0.01). In= or< 10 mm carcinomas, sensitivity was 89.1% for DBC planar SM and 78.3% for …