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Thyrotropin-secreting pituitary adenomas
P Beck-Peccoz1, L Persani, S Mantovani
1Institute of Endocrine Sciences, University of Milan, Ospedale Maggiore IRCCS, Italy.
Metabolism: Clinical and Experimental
|August 1, 1996
Summary
Thyroid-stimulating hormone (TSH)-secreting pituitary adenomas (TSH-omas) cause hyperthyroidism. Diagnosis involves imaging and hormone tests, with surgery being the primary treatment for TSH-oma.
Area of Science:
- Endocrinology
- Neuroendocrinology
- Oncology
Background:
- Thyroid-stimulating hormone (TSH)-secreting pituitary adenomas (TSH-omas) are rare tumors causing hyperthyroidism.
- Elevated TSH levels in hyperthyroid patients are a key indicator of TSH-oma.
Purpose of the Study:
- To outline the diagnostic methods for TSH-secreting pituitary adenomas.
- To review the treatment strategies and outcomes for TSH-oma.
Main Methods:
- Diagnostic evaluation includes imaging (CT/MRI) and dynamic endocrine testing (TRH stimulation).
- Hormonal assessments include TSH, alpha-subunit, SHBG, and molar ratios.
- Familial studies to exclude thyroid hormone resistance (RTH).
Main Results:
- TSH-oma is characterized by normal or elevated TSH in hyperthyroid patients.
- Imaging techniques like CT and MRI are effective for detection.
- Surgical resection achieves remission in most cases; radiotherapy and octreotide are effective alternatives for surgical failures.
Conclusions:
- TSH-oma diagnosis relies on a combination of clinical presentation, imaging, and specific hormonal tests.
- Surgical removal is the primary treatment, with high success rates for radiotherapy and octreotide in persistent cases.
- Post-surgical undetectable TSH levels indicate a cure, confirmed by further dynamic testing.