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[Primary amenorrhoea and macrocephaly].

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Primary amenorrhoea in adolescents can stem from intracranial issues like hydrocephalus. Early head circumference monitoring and brain imaging are crucial for diagnosing central hypogonadism.

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Area of Science:

  • Neuroendocrinology
  • Pediatric Endocrinology

Background:

  • Primary amenorrhoea necessitates a broad differential diagnosis.
  • Hypogonadotropic hypogonadism warrants investigation for intracranial abnormalities.

Observation:

  • A 16-year-old female presented with primary amenorrhoea and hypogonadotropic hypogonadism.
  • Brain MRI revealed a retrocerebellar arachnoid cyst causing secondary hydrocephalus.
  • Increased intracranial pressure led to functional gonadotropin-releasing hormone (GnRH) deficiency.

Findings:

  • Neurosurgical intervention resolved the hydrocephalus, restoring menarche and regular cycles.
  • Macrocephaly in early childhood could have indicated the underlying hydrocephalus earlier.

Implications:

  • Routine head circumference measurements, even post-infancy, are vital for detecting abnormal growth patterns.
  • Brain imaging is essential for primary amenorrhoea cases with central hypogonadism (low gonadotropins).