The combination of the various diagnostic methods of palpable breast mass has improved the diagnostic accuracy. From September 1983 to August 1985 pathologically proven 85 patients with palpable breast masses examined with X-ray mammography, ultrasonography, penumomammography and aspiration cytology at Korea Cancer Center Hospital were analyzed. The diagnostic accuracies of each methods were 77.6% of mammogram, 74.1% of ultrasonogram, 90.5% of penumomammogram and 92.4% of aspiraton cytology. Pneumammogramas was accomplished without difficulty or complication and depicted more clearly delineated mass with various pathognomonic findings; air-ductal pattern in fibroadenoma(90.4%) and cystosarcoma phylloides(100%), air-cystogram in cystic type of fibrocystic disease(100%) and vaculoar pattern or irregular air collection without retained peripheral gas in carcinoma.