1. Diagnostic mammography is recommended as part of the evaluation of any woman age 35 or older who has a breast mass. The sensitivity and specificity of diagnostic mammography in women with a nonpalpable abnormality are 82.3 and 91.2 percent, respectively.

2. Mammography usually cannot determine whether a lump is benign. Mammography misses 10 to 20 percent of clinically palpable breast cancers. Diagnostic mammography usually is not ordered routinely in women under age 35. The breast tissue in younger women is often too dense to evaluate the lump.

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