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Apparently silent somatotroph adenomas.
Pathology, Research and Practice
|December 1, 1991
Summary
This study identifies silent somatotroph adenomas in patients with mild acromegaly symptoms and normal growth hormone (GH) levels. These tumors, characterized by elevated Insulin-like Growth Factor-I (IGF-I), challenge traditional pituitary adenoma diagnoses.
Area of Science:
- Endocrinology
- Oncology
- Pathology
Background:
- Pituitary adenomas can present with varied hormonal activity and clinical manifestations.
- Somatotroph adenomas typically cause acromegaly due to excess growth hormone (GH).
- Some pituitary adenomas may exhibit subtle hormonal profiles, complicating diagnosis.
Purpose of the Study:
- To characterize a cohort of patients with pituitary adenomas presenting with mild acromegaly features.
- To investigate the hormonal and molecular profiles of these adenomas.
- To evaluate the diagnostic criteria for somatotroph adenomas.
Main Methods:
- Analysis of clinical data, including hormonal levels (GH, IGF-I, Prolactin) and imaging.
- Immunocytochemical and electron microscopic examination of tumor tissue.
- Molecular biology techniques to assess GH messenger RNA (mRNA) expression.
Main Results:
- Nine patients with somatotroph adenomas and mild acromegaly symptoms were identified.
- Patients had normal basal GH levels but elevated IGF-I concentrations.
- Tumor analysis revealed GH-producing cells (IRGH) and, in some, prolactin-producing cells (IRPRL), with low GH mRNA levels.
Conclusions:
- The findings suggest a distinct subtype of pituitary adenoma, potentially a 'silent' somatotroph adenoma.
- These adenomas may be misdiagnosed due to normal basal GH levels.
- Reconsideration of diagnostic approaches for pituitary adenomas with atypical hormonal profiles is warranted.