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Difficulty: HardNormal Growth and Development

A 12-year-old girl is brought to the pediatrician by her mother for a routine well-child visit. The mother expresses concern that her daughter has not yet experienced her first menstrual period, noting that several of the patient's classmates have already reached menarche. The patient's medical history is unremarkable, and she takes no medications. Her height is at the 75th percentile and weight is at the 60th percentile for age. A review of her growth chart indicates she experienced a significant acceleration in her linear growth rate approximately 6 months ago. On physical examination, breast tissue and areolae are enlarged and form a single continuous contour. Genital examination reveals dark, coarse, curly pubic hair that is confined to the mons pubis. The parents ask what physical changes they should expect next before menarche begins. Which of the following physical examination findings is most likely to immediately precede or coincide with the onset of this patient's menarche?

  1. Formation of a secondary mound by the areola and papillaAnswer
  2. B
    Extension of pubic hair to the medial surface of the thighs
  3. C
    Maximal acceleration in linear growth rate
  4. D
    Recession of the areola to match the general contour of the breast
  5. E
    Appearance of fine, straight, and slightly pigmented pubic hair

Answer

Formation of a secondary mound by the areola and papilla
The patient is currently at Tanner stage 3 of pubertal development, which is characterized by breast enlargement forming a single continuous contour and dark, coarse, curly pubic hair covering the mons pubis. The normal sequence of female puberty progresses from thelarche (breast budding, Tanner 2) to pubarche (pubic hair appearance, Tanner 2), followed by peak height velocity (which occurs during Tanner stages 2 and 3), and finally menarche. Menarche characteristically occurs during Tanner stage 4 breast development. The clinical hallmark of Tanner stage 4 is the projection of the areola and papilla above the level of the breast to form a distinct secondary mound. Therefore, this physical finding is what will most likely immediately precede or accompany her first period.

Step-by-Step Solution

1
Determine the patient's current stage of pubertal development based on the physical examination.
The patient has breast enlargement forming a single contour and dark, curly hair over the mons pubis. This corresponds to Tanner stage 3 for both breast and pubic hair.
Accurate staging is required to predict the sequence of subsequent developmental milestones.
2
Identify the normal sequence of female pubertal milestones relative to Tanner staging.
The normal sequence is thelarche (breast buds, Tanner 2) -> pubarche (Tanner 2) -> peak height velocity (Tanner 2-3) -> menarche (Tanner 4).
Understanding the sequence allows prediction of what physiological event will occur next.
3
Correlate the onset of menarche with its corresponding physical exam finding.
Menarche typically occurs at Tanner stage 4, which is physically characterized by the areola and papilla forming a secondary mound above the level of the breast.
This identifies the correct clinical sign the parents should expect alongside the onset of menses.

Key Concept

Normal Sequence of Female Pubertal Development and Tanner Staging
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Topics

Normal Growth and Development

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