1. Ultrasonography can determine whether a breast mass is a simple or complex cyst or a solid tumor. It is most useful in the following circumstances:

a. In women under age 35.

b. When a mass detected on screening mam-mography cannot be felt.

c. When the mass is too small or deep for aspiration.

2. The risk of cancer is low if the lesion is a simple cyst on ultrasound. For women with palpable masses, ultrasonography in conjunction with mammography is recommended in women over age 35 and ultrasound alone in women under age 35.

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