Premature thelarche: a possible adrenal disorder

Area of Science:

• Pediatric Endocrinology
• Reproductive Endocrinology

Background:

• Precocious thelarche presents as isolated premature breast development in young girls.
• Distinguishing true precocious puberty from premature thelarche is crucial for appropriate management.

Purpose of the Study:

• To investigate endocrine differences between girls with precocious thelarche and age-matched controls.
• To identify potential hormonal mechanisms underlying precocious thelarche.

Main Methods:

• Comparative endocrine analysis of girls with precocious thelarche and normal girls.
• Measurement of serum hormones including estradiol, estrone, and dehydroepiandrosterone (DHEA).
• Assay of urinary 17-ketosteroids, follicle-stimulating hormone, luteinizing hormone, and prolactin.

Main Results:

• Girls with precocious thelarche exhibited breast development and estrogenized vaginal smears.
• Elevated serum dehydroepiandrosterone (DHEA) levels were observed in girls with precocious thelarche compared to controls.
• Bone age and height were not consistently advanced in all patients.

Conclusions:

• Higher dehydroepiandrosterone (DHEA) levels in precocious thelarche may indicate a precursor role for estrogen synthesis in peripheral tissues.
• This suggests an alternative pathway for estrogenization in some cases of premature sexual development.