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The Pituitary in Gigantism.
Bernd W. Scheithauer1, Kalman T. Kovacs, Lucia Stefaneanu
1MD, PhD.
Endocrine Pathology
|October 1, 1995
Summary
Pituitary lesions in gigantism share similarities with acromegaly but are less invasive and more often feature distinct mammosomatotroph cells. Hyperplasia is more frequent in gigantism, suggesting unique pituitary cell abnormalities.
Area of Science:
- Endocrinology
- Pathology
- Oncology
Background:
- Gigantism and acromegaly are conditions caused by excessive growth hormone (GH) production.
- Understanding the pituitary pathology underlying these conditions is crucial for diagnosis and treatment.
Purpose of the Study:
- To compare the pituitary pathology of gigantism with that of acromegaly.
- To identify distinct cellular and structural features in pituitary lesions from patients with gigantism.
Main Methods:
- Surgical resection and pathological analysis of 19 pituitary lesions from patients with gigantism.
- Immunohistochemistry, electron microscopy (EM), and in situ hybridization (ISH) were used to characterize tumor cell types and hormone expression.
Main Results:
- Pituitary lesions in gigantism, primarily adenomas, showed similarities to acromegaly but were less invasive and less frequently glycoprotein hormone-containing.
- Mammosomatotroph (MS) cells were ultrastructurally distinctive and frequently observed in gigantism lesions.
- A higher frequency of adenoma with hyperplasia (37%) and pure hyperplasia (6%) was noted in gigantism, a rare finding in acromegaly.
Conclusions:
- Pituitary lesions in gigantism exhibit unique features, particularly the prevalence of MS cells and hyperplasia.
- These findings suggest potential hypothalamic dysfunction or intrinsic pituitary cell abnormalities in gigantism.
- The distinct pathology may inform differential diagnosis and therapeutic strategies for GH excess disorders.