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Subclinical pituitary microadenomas.

M G Siqueira, A L Guembarovski

    Surgical Neurology
    |August 1, 1984
    PubMed
    Summary

    Asymptomatic pituitary microadenomas were found in 36 of 450 autopsy pituitary glands, predominantly in older males. Histology showed no difference from symptomatic cases, suggesting a potential preclinical stage.

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    Area of Science:

    • Endocrinology
    • Pathology
    • Oncology

    Background:

    • Pituitary microadenomas are common tumors, but their natural history and incidence in asymptomatic individuals remain unclear.
    • Understanding subclinical pituitary lesions is crucial for differentiating them from clinically significant adenomas.

    Purpose of the Study:

    • To determine the incidence and natural history of asymptomatic pituitary microadenomas.
    • To compare the histological features of asymptomatic microadenomas with symptomatic ones.

    Main Methods:

    • Autopsy examination of 450 pituitary glands from a broad age range of both sexes without pituitary dysfunction.
    • Review of medical records and skull X-rays for clinical endocrinopathy and radiological abnormalities in patients with subclinical microadenomas.

    Main Results:

    • Thirty-nine tumors were identified in 36 pituitary glands, with peak incidence in the seventh decade and a male predominance.
    • No significant histological differences were observed between asymptomatic (subclinical) and symptomatic pituitary tumors.
    • No significant radiological abnormalities of the sella turcica were detected in the subclinical microadenoma group.

    Conclusions:

    • Asymptomatic pituitary microadenomas are relatively common, particularly in older males.
    • The histological similarity suggests these subclinical tumors may represent a preclinical stage of pituitary adenoma or a distinct entity.

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