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Related Experiment Videos

Patients with primary hypothyroidism presenting as prolactinomas.

M R Grubb1, D Chakeres, W B Malarkey

  • 1Department of Internal Medicine, Ohio State University, Columbus.

The American Journal of Medicine
|October 1, 1987
PubMed
Summary

Primary hypothyroidism can cause elevated prolactin levels, mimicking prolactinomas. Treating hypothyroidism resolved pituitary "pseudotumors" and normalized prolactin, highlighting the importance of thyroid-stimulating hormone testing.

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Area of Science:

  • Endocrinology
  • Reproductive Medicine

Background:

  • Hyperprolactinemia, characterized by elevated serum prolactin, can be associated with primary hypothyroidism.
  • Patients may present with symptoms like galactorrhea and amenorrhea, and imaging may suggest pituitary tumors.

Observation:

  • Two women with hypothyroidism presented with hyperprolactinemia and imaging findings suggestive of pituitary tumors.
  • Initial assessment suggested prolactinomas, but elevated thyroid-stimulating hormone levels indicated primary hypothyroidism with secondary pituitary hyperplasia.

Findings:

  • Thyroxine therapy led to the resolution of pituitary "pseudotumors" and normalization of both prolactin and thyroid hormone levels.
  • Dopamine-prolactin interactions showed abnormalities, but the precise cause of hyperprolactinemia in this context remains unclear.

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Implications:

  • Measuring thyroid-stimulating hormone levels is crucial in patients suspected of having prolactinomas.
  • Hypothyroidism should be considered and ruled out to prevent misdiagnosis of secondary hypothyroidism due to pituitary tumors.