thelarche
Pronunciation: thee-LAR-kee
The onset of breast development, typically the first sign of puberty in girls.
Full Definition
Thelarche refers to the beginning of breast development in girls, marking the onset of female puberty. This typically occurs between ages 8-13 years and represents the first visible sign of pubertal development in most girls. Thelarche results from increased estrogen production by the ovaries in response to rising gonadotropin levels. In clinical assessment, breast development is staged according to the Tanner scale, with thelarche corresponding to Tanner stage 2. Premature thelarche refers to isolated breast development before age 8 in girls, which may be benign or require further evaluation. The timing and progression of thelarche are important indicators used in pediatric endocrinology to assess normal versus abnormal pubertal development.
Usage
Usage note: Distinguish from other pubertal milestones; often confused with menarche in lay contexts.
In Context
- "Thelarche occurred at age 7, prompting evaluation for precocious puberty." — Clinical history
- "The patient showed normal thelarche at 10 years of age with appropriate progression." — Growth and development assessment