Precocious Puberty

Definition

• Onset of secondary sexual characteristics before age 8 in girls and before age 9 in boys

• Classified as central (gonadotropin-dependent) or peripheral (gonadotropin-independent) based on underlying pathophysiology

• Early pubertal changes include breast development in girls and testicular enlargement (volume >4 mL) in boys

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Normal Age of Puberty

• Girls typically begin at approximately 10.5 years

• Boys typically begin at approximately 11.5 years

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Tanner Stages

• Stage 1: Prepubertal

• Stage 2:

  • Girls: Breast budding and sparse pubic hair

  • Boys: Testicular enlargement and sparse pubic hair

• Stages 3–5: Progressive development of secondary sexual characteristics, with menarche occurring in girls

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Differential Diagnosis

• Central Precocious Puberty (Gonadotropin-Dependent)

  • Idiopathic (most common)

  • Hypothalamic hamartoma or other CNS tumours

• Peripheral Precocious Puberty (Gonadotropin-Independent)

  • Adrenal causes such as congenital adrenal hyperplasia or adrenal tumours

  • Gonadal causes including ovarian cysts or testicular tumours

  • Exogenous hormone exposure from topical creams or medications

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Investigations

• Hormonal Evaluation

  • Measure LH, FSH, and sex steroids (estradiol in girls, testosterone in boys)

  • GnRH stimulation test: A rise in LH confirms central cause

• Bone Age Assessment

  • Wrist X-ray to assess for advanced bone age indicative of increased hormonal activity

• Imaging

  • MRI brain to exclude CNS lesions in central precocious puberty

  • Pelvic ultrasound in girls or testicular ultrasound in boys to evaluate gonadal pathology

  • Adrenal imaging if adrenal pathology is suspected

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Management

• Central Precocious Puberty

  • GnRH analogues (eg, leuprolide) to suppress premature gonadotropin release

• Peripheral Precocious Puberty

  • Target underlying cause (eg, tumour resection or cessation of exogenous hormone exposure)

• Supportive Care

  • Provide psychological counselling to address social and emotional impacts

  • Regular monitoring of growth, bone age, and pubertal progression to prevent early epiphyseal closure

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Notes:

• Early intervention prevents premature growth plate closure and short stature

• Rapid progression or neurological symptoms necessitate urgent evaluation

• Family history of early puberty may contribute and should be documented

• Monitoring should include regular assessment of growth velocity and pubertal staging

• Long-term follow-up is important to adjust treatment and optimise adult height

• Psychosocial support is crucial to help children manage the challenges of early puberty

• Emerging evidence on maternal factors may influence pubertal timing and warrants further research

• Differentiation between central and peripheral causes is key to appropriate management

• A multidisciplinary approach involving endocrinologists, paediatricians and psychologists is recommended for optimal care

• Comprehensive history, physical examination and targeted investigations are essential to guide treatment decisions