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Hypopituitarism patterns and prevalence among men with macroprolactinomas.

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Men with macroprolactinomas experience partial hypopituitarism, particularly affecting testosterone levels. Larger tumors correlate with more severe pituitary dysfunction, but most patients recover cortisol function post-treatment.

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Area of Science:

  • Endocrinology
  • Oncology
  • Neuroscience

Background:

  • Prolactin-secreting pituitary tumors (prolactinomas) are common, with macroadenomas (≥10 mm) frequently observed in men.
  • The extent of pituitary dysfunction and recovery post-treatment can vary based on prolactinoma size.

Purpose of the Study:

  • To investigate the characteristics of hypopituitarism in men with macroprolactinomas.
  • To assess the recovery of pituitary function after treatment in this patient group.

Main Methods:

  • Retrospective analysis of 81 men with pituitary macroadenomas and hyperprolactinemia.
  • Patients categorized into three groups based on adenoma size: 10-19 mm, 20-39 mm, and ≥40 mm.
  • Comparison of hormone levels (testosterone, gonadotropins, cortisol, thyroid hormones, hemoglobin) before and after treatment.

Main Results:

  • Prevalence of hypogonadism was high across all size groups (75.0% to 93.5%).
  • Central hypocortisolism and hypothyroidism increased with adenoma size, notably in the largest group (≥40 mm).
  • Anemia prevalence also correlated with tumor size, and larger adenomas predicted lower free T4 levels post-treatment.

Conclusions:

  • Macroprolactinomas in men commonly cause partial hypopituitarism, with testosterone deficiency being universal.
  • Larger adenomas are associated with more significant pituitary dysfunction, particularly affecting cortisol levels.
  • While most patients recover central hypocortisolism, hypothyroidism recovery is less common post-treatment.