[Thyrotropin-secreting pituitary adenomas]

Area of Science:

• Endocrinology
• Oncology
• Neurosurgery

Background:

• TSH-secreting pituitary adenomas are rare, accounting for 0.5-1% of pituitary tumors.
• Increased recognition is due to sensitive TSH assays, improved imaging, and routine thyroid hormone testing.
• Patients typically present with mild to moderate hyperthyroidism symptoms.

Purpose of the Study:

• To review the diagnosis and management of TSH-secreting pituitary adenomas.
• To differentiate these tumors from pituitary resistance to thyroid hormone syndrome.
• To outline current treatment strategies based on tumor size and invasiveness.

Main Methods:

• Review of clinical presentation and hormonal evaluation.
• Diagnostic criteria including serum TSH and free thyroid hormones.
• Magnetic resonance imaging (MRI) for tumor detection and characterization.
• Assessment of treatment outcomes for surgical and medical interventions.

Main Results:

• Hormonal profile shows elevated free thyroid hormones with detectable, normal, or elevated TSH.
• Differential diagnosis includes pituitary resistance to thyroid hormone syndrome.
• MRI confirms pituitary adenomas in most cases.
• Transsphenoidal surgery is effective for microadenomas.

Conclusions:

• TSH-secreting pituitary adenomas require careful hormonal and imaging assessment for accurate diagnosis.
• Transsphenoidal surgery is the preferred treatment for microadenomas.
• Somatostatin analogs offer an alternative for macroadenomas or invasive tumors.