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1. Normal prepubertal breast ultrasound

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Figure 9-1

Normal prepubertal breast ultrasound.

Sonography of a 7-year-old girl shows normal breast tissue as a small hypoechoic area (arrows) within the subcutaneous adipose tissue. The deeper hypoechoic structure is the pectoralis muscle.

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2. Transient gynecomastia of the newborn

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Figure 9-2

Transient gynecomastia of the newborn.

A-D. Sonographic images of the right and left breasts of a 30-day-old male (A, B) and a 25-day-old female (C, D) with breast enlargement and nipple discharge show prominent breast tissue with dilated ducts.

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3. Asymmetrical breast development at thelarche

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Figure 9-3

Asymmetrical breast development at thelarche.

The parents of this 8-year-old girl reported a "lump in the right breast." A. Sonography of the right breast shows a pubertal pattern of developing breast tissue. The cursor measurement at the base of the breast tissue is 2.2 cm. B. The breast bud on the left is smaller, with a diameter of 1.2 cm.

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4. Premature thelarche

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Figure 9-4

Premature thelarche.

There is abnormally advanced development of otherwise normal-appearing breast tissue (cursors) on this sonographic image of a 5-year-old girl.

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5. Unilateral gynecomastia

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Figure 9-5

Unilateral gynecomastia.

This 12-year-old boy had a palpable left retroareolar nodule. A. A longitudinal sonographic image of the left breast shows prominent hypoechoic mammary tissue (arrows), measuring 1.4 cm in diameter and 0.5 cm in depth. B. Breast tissue on the right (arrows) is normal for age, measuring 0.6 cm in diameter and 0.2 cm in depth.

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6. Gynecomastia

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Figure 9-6

Gynecomastia.

Enlarged breast tissue in this 10-year-old boy appears hypoechoic (arrows) relative to adjacent adipose tissue on this transverse sonographic image. The deeper linear stripes are the pectoralis muscle.

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7. Retroareolar cysts

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Figure 9-7

Retroareolar cysts.

A-C. Sonography of retroareolar cysts in three different teenage girls. These uninfected cysts have thin walls, and lack internal debris. Note prominent acoustic enhancement of the large cyst in A.

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8. Fibroadenoma

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Figure 9-8

Fibroadenoma.

Breast sonography of a 15-year-old girl with a palpable lump demonstrates an oval hypoechoic mass with slightly lobulated borders. There is a thin echogenic capsule.

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