Pilot Study of Us-Guided Core Needle Biopsy for Non-Palpable Tumorous Lesions of the Breast

To prove the usefulness and pitfall of ultrasonography guided core needle biopsy (US-CNB) for non-palpable tumorous lesions of the breast and to reveal these clinicopathological features, we carried out US-CNB at the outpatient clinic in thirteen non-palpable tumorous lesions in ten cases during a period from May 1996 to Oct. 1996. The results were: 1) The sufficient sampling rate for non-palpable tumorous lesions were which were possible to be pathologically diagnosed 84.6% (11/13). 2) One non-palpable tumorous lesion (class 3 by US-guided fine needle biopsy) was revealed to be a ductal cancer by US-CNB. 3) Most of non-palpable lesions which were visualized as low echogenic tumorous lesions on ultrasonography were revealed to be the epithelial hyperplasia lesion by US-CNB. These results suggest that US-CNB is an acceptable sampling method for non-palpable tumorus lesion of the breast.