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[Corticotropic hypophyseal microadenomas detected by immunohistochemical methods]
1II. patologicko anatomický ústav FVL UK.
Ceskoslovenska Patologie
|May 1, 1990
Summary
Small pituitary adenomas can cause Cushing syndrome without visible sella turcica lesions. Nelson syndrome is preventable post-adrenalectomy with proper substitution, and immunohistochemistry is key for small adenoma study.
Area of Science:
- Endocrinology
- Pathology
- Oncology
Background:
- Corticotrophic pituitary adenomas are a significant cause of Cushing syndrome.
- Understanding the diagnostic and management nuances of small adenomas is crucial.
Observation:
- Two autoptic cases (47-year-old male, 60-year-old female) of corticotrophic pituitary adenomas were studied.
- Small adenomas with mature corticotrophic cells presented severe Cushing syndrome without sella turcica lesions or optic chiasm compression.
Findings:
- Minute pituitary adenomas can induce significant Cushing syndrome, potentially precluding pituitary surgery due to patient condition.
- Nelson syndrome is not an inevitable outcome following bilateral adrenalectomy if adequate substitution therapy is provided.
- Immunohistochemistry is the preferred method for studying very small adenomas, while larger ones benefit from electron microscopy.
- Immunohistology for ACTH is viable in autoptic samples if autolysis is minimal.
Implications:
- Early detection and characterization of small pituitary adenomas are vital for appropriate patient management.
- Adrenalectomy followed by substitution therapy offers a viable strategy to prevent Nelson syndrome.
- Advanced histological techniques like immunohistochemistry and electron microscopy aid in the precise diagnosis of pituitary adenomas.