PURPOSE: To evaluate the usefulness of routine mammography in the detection of local recurrence of breast cancer after mastectomy. MATERIALS AND METHODS: The clinical and mammographic records of 45 patients whounderwent modified mastectomy due to breast cancer were prospectively reviewed. The methods of mastectomy wereAuchincloss (n=36), Patey (n=8) and simple resection (n=1). RESULTS:s Among the 45 patients, five palpable lesionswere detected on physical examination: two of the five were confirmed as tumor recurrence; on mammography, anodule with microcalcifications and low-density lesion was seen, but the other three were benign. In 40 patientsthe results of palpation were negative and during follow-up (mean, 10.9 months ) no newly developed lesions wereseen. On mammography, ten of 45(22.2%) patients showed abnormalities, namely local skin thickening(n=4,40%),increased density in subcutaneous tissue(n=2,20%), nodules(n=2,20%), benign calcification(n=1,10%) and focallow-density lesion(n=1,10%), but only one case with a nodule was confirmed to be recurrence. CONCLUSION: Routinemammography of a mastectomy site was not useful for the differentiation of palpable lesions.