Sixty-two women had excisional breast biopsy for areas of microcalcification detected by mammography with no associated palpable mass. Carcinoma was discovered in 20 patients (32 percent). These cancers ranged in size from 0.6 to 14 mm in greatest diameter. Six patients had multicentric carcinoma, including one synchronous bilateral lobular carcinoma. Axillary metastasis was present in three patients (15 percent), each with multicentric lesions. Chronic cystic mastopathy (55 percent) was the most common finding associated with microcalcification. In six patients (30 percent) with carcinoma, the microcalcification was present only in adjacent tissue and ducts. Generous excisional biopsy, verification of excision of the site of microcalcification by roentgenographic examination of the specimen, and thorough histologic examination by paraffin section are mandatory to detect these early and potentially curable breast carcinomas.
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